feat: add isolated utility export modes

app.py

@@ -18,7 +18,7 @@ HTML_FORM = """
 <html>
   <head>
     <meta charset="utf-8">
-    <title>YouTube Playlist Submit</title>
+    <title>YouTube Media Submit</title>
 
     <!-- Make it behave on mobile -->
     <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
@@ -96,6 +96,33 @@ HTML_FORM = """
         font-size: 1rem;
       }
 
+      input[type="radio"] {
+        width: auto;
+        margin: 0;
+      }
+
+      fieldset {
+        border: 0;
+        padding: 0;
+      }
+
+      legend {
+        margin-bottom: 0.35rem;
+        font-size: 0.92rem;
+      }
+
+      .download-options {
+        display: grid;
+        gap: 0.4rem;
+      }
+
+      .download-options label {
+        display: flex;
+        align-items: center;
+        gap: 0.55rem;
+        margin: 0;
+      }
+
       input::placeholder,
       textarea::placeholder {
         color: #6b7280;
@@ -139,6 +166,26 @@ HTML_FORM = """
         color: #9ca3af;
       }
 
+      .export-status {
+        margin-top: 1rem;
+        padding-top: 0.9rem;
+        border-top: 1px solid rgba(148, 163, 184, 0.25);
+      }
+
+      .export-job {
+        margin-top: 0.65rem;
+        padding: 0.65rem 0.75rem;
+        border-radius: 0.55rem;
+        background: rgba(30, 41, 59, 0.7);
+        font-size: 0.82rem;
+      }
+
+      .export-path,
+      .export-error {
+        overflow-wrap: anywhere;
+        color: #cbd5e1;
+      }
+
       @media (max-width: 480px) {
         .page-wrapper {
           padding: 1rem;
@@ -167,9 +214,9 @@ HTML_FORM = """
   <body>
     <div class="page-wrapper">
       <div class="card">
-        <h2>Submit YouTube Playlist</h2>
+        <h2>Submit YouTube Media</h2>
         <p class="subtitle">
-          Paste a playlist link below. It’ll be queued for download and assigned to the next free slot.
+          Paste a YouTube video or playlist link and choose a download type.
         </p>
 
         {% with messages = get_flashed_messages() %}
@@ -212,12 +259,40 @@ HTML_FORM = """
             ></textarea>
           </div>
 
-          <button type="submit">Submit Playlist</button>
+          <fieldset class="form-group">
+            <legend>Download as:</legend>
+            <div class="download-options">
+              <label><input type="radio" name="download_mode" value="player_slot" checked> Player Slot</label>
+              <label><input type="radio" name="download_mode" value="mp4"> MP4 Export</label>
+              <label><input type="radio" name="download_mode" value="m4a"> M4A Audio</label>
+              <label><input type="radio" name="download_mode" value="mp3"> MP3 Audio</label>
+            </div>
+          </fieldset>
+
+          <button type="submit">Submit</button>
         </form>
 
         <p class="helper">
           Playlists are kept for roughly 48 hours after they’re downloaded.
+          Utility exports are kept until an operator removes them.
         </p>
+
+        {% if export_jobs %}
+          <section class="export-status">
+            <strong>Recent utility exports</strong>
+            {% for job in export_jobs %}
+              <div class="export-job">
+                <div>{{ download_mode_labels[job.mode] }} — {{ export_status_labels[job.status] }} (job {{ job.job_id[:8] }})</div>
+                {% for path in job.output_paths %}
+                  <div class="export-path">{{ path }}</div>
+                {% endfor %}
+                {% if job.error %}
+                  <div class="export-error">{{ job.error }}</div>
+                {% endif %}
+              </div>
+            {% endfor %}
+          </section>
+        {% endif %}
       </div>
     </div>
   </body>
@@ -238,6 +313,19 @@ MAX_URL_LENGTH = 2048
 MAX_SUBMITTER_LENGTH = 200
 MAX_NOTE_LENGTH = 1000
 MAX_REQUEST_CONTENT_LENGTH = 32 * 1024
+DOWNLOAD_MODE_LABELS = {
+    "player_slot": "Player Slot",
+    "mp4": "MP4 Export",
+    "m4a": "M4A Audio",
+    "mp3": "MP3 Audio",
+}
+EXPORT_STATUS_LABELS = {
+    "queued": "queued",
+    "running": "downloading",
+    "completed": "completed",
+    "failed": "failed",
+    "interrupted": "interrupted",
+}
 
 
 def _valid_media_url(value: str) -> bool:
@@ -258,6 +346,20 @@ def _valid_media_url(value: str) -> bool:
 
 def _submission_message(result: dict[str, object]) -> str:
     status = result.get("status")
+    if result.get("kind") == "export":
+        mode = str(result.get("mode") or "")
+        label = DOWNLOAD_MODE_LABELS.get(mode, "Utility export")
+        if status == "queue_full":
+            return "The utility export queue is full; please try again later."
+        if status == "shutting_down":
+            return "The Controller is shutting down; please try again shortly."
+        if status == "worker_error":
+            return f"The {label} job was reserved, but its worker could not start."
+        if status != "queued":
+            return f"The Controller could not queue that {label} job; please try again."
+        job_id = str(result.get("job_id") or "")[:8]
+        identity = f" (job {job_id})" if job_id else ""
+        return f"{label} queued{identity}. Refresh this page to see its result."
     if status == "queue_full":
         seconds = max(0, int(result.get("oldest_expires_in_seconds") or 0))
         hours = max(1, (seconds + 3599) // 3600)
@@ -308,7 +410,19 @@ def create_app(
 
     @web_app.get("/")
     def index():
-        return render_template_string(HTML_FORM)
+        try:
+            export_jobs = service.list_export_jobs(
+                limit=min(100, config.downloads.max_queued_exports + 10)
+            )
+        except Exception as exc:
+            LOG.warning("could not load utility export status: %s", exc)
+            export_jobs = []
+        return render_template_string(
+            HTML_FORM,
+            export_jobs=export_jobs,
+            download_mode_labels=DOWNLOAD_MODE_LABELS,
+            export_status_labels=EXPORT_STATUS_LABELS,
+        )
 
     @web_app.errorhandler(413)
     def _submission_too_large(_error):
@@ -320,6 +434,8 @@ def create_app(
         url = request.form.get("url", "").strip()
         submitter = request.form.get("submitter", "").strip() or None
         note = request.form.get("note", "").strip() or None
+        raw_mode = request.form.get("download_mode", "player_slot")
+        download_mode = raw_mode.strip() if isinstance(raw_mode, str) else ""
 
         if not _valid_media_url(url):
             flash(
@@ -333,9 +449,20 @@ def create_app(
         if note is not None and len(note) > MAX_NOTE_LENGTH:
             flash(f"The note must be {MAX_NOTE_LENGTH} characters or fewer.")
             return redirect(url_for("index"))
+        if download_mode not in DOWNLOAD_MODE_LABELS:
+            flash("Invalid download type. Choose one of the available options.")
+            return redirect(url_for("index"))
 
         try:
-            result = service.enqueue_download(url, submitter, note)
+            if download_mode == "player_slot":
+                result = service.enqueue_download(url, submitter, note)
+            else:
+                result = service.enqueue_export(
+                    url,
+                    download_mode,
+                    submitter,
+                    note,
+                )
         except ControllerUnavailableError as exc:
             LOG.warning("playlist submission was rejected: %s", exc)
             flash("The Controller is unavailable; please try again shortly.")

config.yaml

@@ -51,6 +51,8 @@ downloads:
   # Utility exports live below media_base and never participate in slots.
   export_directory: exports
   export_max_height: 1080
+  # Dedicated capacity prevents utility exports from starving Player work.
+  export_max_workers: 1
   # Bounds queued + running utility work; Player slots retain their own bound.
   max_queued_exports: 20
 

controller/config.py

@@ -65,6 +65,7 @@ class DownloadConfig:
     max_height: int = 1080
     export_directory: Path = Path("exports")
     export_max_height: int = 1080
+    export_max_workers: int = 1
     max_queued_exports: int = 20
 
 
@@ -186,6 +187,9 @@ def _relative_directory(value: Any, name: str) -> Path:
         or "\\" in text
     ):
         raise ConfigError(f"{name} must be a safe relative directory")
+    reserved_roots = {f"slot{slot}" for slot in SLOT_IDS} | {".controller-trash"}
+    if path.parts[0].casefold() in reserved_roots:
+        raise ConfigError(f"{name} must not overlap Controller slot storage")
     return path
 
 
@@ -302,6 +306,11 @@ def load_config(
             downloads_raw.get("export_max_height", 1080),
             "downloads.export_max_height",
         ),
+        export_max_workers=_integer(
+            downloads_raw.get("export_max_workers", 1),
+            "downloads.export_max_workers",
+            maximum=10,
+        ),
         max_queued_exports=_integer(
             downloads_raw.get("max_queued_exports", 20),
             "downloads.max_queued_exports",

controller/downloads.py

@@ -2,14 +2,18 @@
 
 from __future__ import annotations
 
+import json
 import logging
 import os
+import re
 import signal
 import shutil
+import stat
 import subprocess
 import tempfile
 import threading
 import time
+import unicodedata
 import uuid
 from collections.abc import Iterator
 from contextlib import contextmanager
@@ -20,12 +24,31 @@ from typing import Any, Callable
 
 from .config import ControllerConfig
 from .contracts import SLOT_IDS
-from .models import DeleteToken, DownloadReservation, SlotProtectedError, StaleOperationError
+from .models import (
+    DeleteToken,
+    DownloadReservation,
+    ExportReservation,
+    SlotProtectedError,
+    StaleOperationError,
+    UTILITY_EXPORT_MODES,
+)
 from .store import ControllerStore
 
 
 LOG = logging.getLogger(__name__)
 MEDIA_EXTENSIONS = frozenset({".mp4", ".mkv", ".webm", ".mov", ".m4v"})
+VIDEO_EXPORT_INPUT_EXTENSIONS = frozenset(
+    {*MEDIA_EXTENSIONS, ".avi", ".flv", ".ts"}
+)
+EXPORT_AUDIO_EXTENSIONS = {"m4a": ".m4a", "mp3": ".mp3"}
+MAX_EXPORT_STEM_BYTES = 180
+EXPORT_MANIFEST_NAME = "manifest.json"
+_INVALID_FILENAME_CHARACTERS = frozenset('<>:"/\\|?*')
+_WINDOWS_RESERVED_NAMES = frozenset(
+    {"CON", "PRN", "AUX", "NUL"}
+    | {f"COM{index}" for index in range(1, 10)}
+    | {f"LPT{index}" for index in range(1, 10)}
+)
 
 
 @dataclass(frozen=True)
@@ -43,6 +66,16 @@ class DownloadEvent:
     reused_slot: bool = False
 
 
+@dataclass(frozen=True)
+class MediaInspection:
+    format_names: frozenset[str]
+    video_codec: str | None
+    audio_codec: str | None
+    pixel_format: str | None
+    width: int | None
+    height: int | None
+
+
 EventCallback = Callable[[DownloadEvent], None]
 Runner = Callable[..., subprocess.CompletedProcess[str]]
 
@@ -63,6 +96,54 @@ def player_format_selector(max_height: int) -> str:
     return f"bv*[height<={max_height}]+ba/b[height<={max_height}]"
 
 
+def mp4_export_format_selector(max_height: int) -> str:
+    """Select quality first while making native AVC/AAC the equal-quality preference."""
+
+    return f"bv*[height<={max_height}]+ba/b[height<={max_height}]"
+
+
+def safe_export_filename(
+    stem: str,
+    extension: str,
+    *,
+    used_casefolded: set[str] | None = None,
+) -> str:
+    """Return a bounded Unicode filename that cannot introduce a path component."""
+
+    if extension not in {".mp4", ".m4a", ".mp3"}:
+        raise ValueError("unsupported export filename extension")
+    normalized = unicodedata.normalize("NFC", str(stem))
+    cleaned = "".join(
+        "_"
+        if character in _INVALID_FILENAME_CHARACTERS
+        or ord(character) < 32
+        or ord(character) == 127
+        else character
+        for character in normalized
+    )
+    cleaned = re.sub(r"\s+", " ", cleaned).strip(" .") or "untitled"
+    if cleaned.split(".", 1)[0].upper() in _WINDOWS_RESERVED_NAMES:
+        cleaned = f"_{cleaned}"
+
+    def bounded(value: str, suffix: str) -> str:
+        available = MAX_EXPORT_STEM_BYTES - len(suffix.encode("utf-8"))
+        candidate = value
+        while candidate and len(candidate.encode("utf-8")) > available:
+            candidate = candidate[:-1]
+        return (candidate.rstrip(" .") or "untitled") + suffix
+
+    used = used_casefolded if used_casefolded is not None else set()
+    counter = 1
+    while True:
+        collision_suffix = "" if counter == 1 else f" ({counter})"
+        filename = bounded(cleaned, collision_suffix) + extension
+        folded = filename.casefold()
+        if folded not in used:
+            used.add(folded)
+            return filename
+        counter += 1
+
+
 def title_from_filename(path: Path) -> str:
     stem = path.stem
     if " - " in stem:
@@ -83,6 +164,7 @@ class DownloadManager:
         on_event: EventCallback | None = None,
         runner: Runner | None = None,
         executor: ThreadPoolExecutor | None = None,
+        export_executor: ThreadPoolExecutor | None = None,
     ):
         self.config = config
         self.store = store
@@ -93,6 +175,19 @@ class DownloadManager:
             thread_name_prefix="yt-download",
         )
         self._owns_executor = executor is None
+        if export_executor is not None:
+            self._export_executor = export_executor
+            self._owns_export_executor = False
+        elif executor is not None:
+            # Deterministic callers/tests may inject one executor explicitly.
+            self._export_executor = executor
+            self._owns_export_executor = False
+        else:
+            self._export_executor = ThreadPoolExecutor(
+                max_workers=config.downloads.export_max_workers,
+                thread_name_prefix="yt-export",
+            )
+            self._owns_export_executor = True
         self._lock = threading.Lock()
         self._futures: set[Future[Any]] = set()
         self._processes: set[subprocess.Popen[str]] = set()
@@ -167,6 +262,49 @@ class DownloadManager:
         future.add_done_callback(self._forget_future)
         return reservation
 
+    def enqueue_export(
+        self,
+        url: str,
+        mode: str,
+        submitter: str | None,
+        note: str | None,
+    ) -> ExportReservation:
+        """Reserve and queue a utility export without touching Player slots."""
+
+        if mode not in UTILITY_EXPORT_MODES:
+            raise ValueError("unsupported utility export mode")
+        with self._lock:
+            if self._stopping:
+                return ExportReservation(status="shutting_down")
+        reservation = self.store.reserve_export_job(
+            url,
+            mode,
+            submitter,
+            note,
+            max_active=self.config.downloads.max_queued_exports,
+        )
+        if reservation.status != "queued":
+            return reservation
+        assert reservation.job_id is not None
+        try:
+            future = self._export_executor.submit(
+                self._export,
+                url,
+                mode,
+                reservation.job_id,
+            )
+        except BaseException as exc:
+            message = f"could not start export worker: {exc}"
+            self.store.fail_export_job(reservation.job_id, message)
+            return ExportReservation(
+                status="worker_error",
+                job_id=reservation.job_id,
+            )
+        with self._lock:
+            self._futures.add(future)
+        future.add_done_callback(self._forget_future)
+        return reservation
+
     def _forget_future(self, future: Future[Any]) -> None:
         with self._lock:
             self._futures.discard(future)
@@ -374,12 +512,636 @@ class DownloadManager:
                 )
             )
 
+    def _export(
+        self,
+        url: str,
+        mode: str,
+        job_id: str,
+    ) -> None:
+        if not self.store.mark_export_running(job_id):
+            return
+        work_directory: Path | None = None
+        published = False
+        completed = False
+        try:
+            work_directory, source_directory, ready_directory, final_parent = (
+                self._prepare_export_directories(job_id, mode)
+            )
+            with self._yt_dlp_arguments() as base_arguments:
+                arguments = base_arguments + self._export_download_arguments(
+                    mode,
+                    source_directory,
+                    url,
+                )
+                self._run_command(
+                    arguments,
+                    check=True,
+                    text=True,
+                    timeout=self.config.downloads.process_timeout_seconds,
+                )
+
+            sources = self._export_source_files(source_directory, mode)
+            if not sources:
+                raise RuntimeError("yt-dlp completed without producing export media")
+            used_names: set[str] = set()
+            ready_outputs: list[Path] = []
+            for source in sources:
+                extension = ".mp4" if mode == "mp4" else EXPORT_AUDIO_EXTENSIONS[mode]
+                output = ready_directory / safe_export_filename(
+                    source.stem,
+                    extension,
+                    used_casefolded=used_names,
+                )
+                if mode == "mp4":
+                    self._produce_compatible_mp4(source, output)
+                else:
+                    inspection = self._inspect_media(source)
+                    self._validate_audio_export(inspection, mode)
+                    os.replace(source, output)
+                self._fsync_file(output)
+                ready_outputs.append(output)
+
+            self._fsync_directory(ready_directory)
+            self._write_export_manifest(
+                work_directory,
+                job_id=job_id,
+                mode=mode,
+                filenames=[output.name for output in ready_outputs],
+            )
+            published_directory = final_parent / job_id
+            if os.path.lexists(published_directory):
+                raise FileExistsError(
+                    f"refusing to overwrite existing export directory: {published_directory}"
+                )
+            os.rename(ready_directory, published_directory)
+            self._fsync_directory(final_parent)
+            published = True
+            media_base = self.config.storage.media_base.resolve()
+            output_paths = tuple(
+                str((published_directory / output.name).resolve().relative_to(media_base))
+                for output in ready_outputs
+            )
+            if not self.store.complete_export_job(job_id, output_paths):
+                raise StaleOperationError(
+                    "published export could not transition its durable job"
+                )
+            completed = True
+        except BaseException as exc:
+            message = self._failure_message(exc)
+            try:
+                self.store.fail_export_job(job_id, message)
+            except BaseException:
+                LOG.exception("could not persist utility export failure for %s", job_id)
+            if published:
+                LOG.error(
+                    "utility export %s was published but needs restart reconciliation: %s",
+                    job_id,
+                    message,
+                )
+            else:
+                LOG.warning("utility export %s failed: %s", job_id, message)
+        finally:
+            if work_directory is not None and (not published or completed):
+                self._remove_export_work_directory(work_directory)
+
+    def _export_download_arguments(
+        self,
+        mode: str,
+        source_directory: Path,
+        url: str,
+    ) -> list[str]:
+        arguments = [
+            "--yes-playlist",
+            "--no-overwrites",
+            "--no-progress",
+            "--windows-filenames",
+            "--trim-filenames",
+            str(MAX_EXPORT_STEM_BYTES),
+            "-o",
+            str(
+                source_directory
+                / "%(playlist_index)03d - %(title)s [%(id)s].%(ext)s"
+            ),
+        ]
+        if mode == "mp4":
+            arguments.extend(
+                (
+                    "-f",
+                    mp4_export_format_selector(
+                        self.config.downloads.export_max_height
+                    ),
+                    "-S",
+                    (
+                        f"res:{self.config.downloads.export_max_height},"
+                        "vcodec:h264,acodec:aac"
+                    ),
+                )
+            )
+        elif mode == "m4a":
+            arguments.extend(
+                (
+                    "-f",
+                    "ba/b",
+                    "-S",
+                    "abr,acodec:aac",
+                    "-x",
+                    "--audio-format",
+                    "m4a",
+                    "--audio-quality",
+                    "0",
+                )
+            )
+        elif mode == "mp3":
+            arguments.extend(
+                (
+                    "-f",
+                    "ba/b",
+                    "-x",
+                    "--audio-format",
+                    "mp3",
+                    "--audio-quality",
+                    "0",
+                )
+            )
+        else:
+            raise ValueError("unsupported utility export mode")
+        arguments.append(url)
+        return arguments
+
+    def _prepare_export_directories(
+        self,
+        job_id: str,
+        mode: str,
+    ) -> tuple[Path, Path, Path, Path]:
+        if not re.fullmatch(r"[0-9a-f]{32}", job_id):
+            raise ValueError("invalid export job identity")
+        media_base = self.config.storage.media_base
+        media_base.mkdir(parents=True, exist_ok=True)
+        export_root = media_base
+        for part in self.config.downloads.export_directory.parts:
+            export_root = export_root / part
+            self._ensure_real_directory(export_root)
+        work_root = export_root / ".work"
+        final_parent = export_root / ("video" if mode == "mp4" else "audio")
+        self._ensure_real_directory(work_root)
+        self._ensure_real_directory(final_parent)
+        work_directory = work_root / job_id
+        work_directory.mkdir(mode=0o750, exist_ok=False)
+        source_directory = work_directory / "source"
+        ready_directory = work_directory / "ready"
+        source_directory.mkdir(mode=0o750)
+        ready_directory.mkdir(mode=0o750)
+        self._fsync_directory(work_root)
+        return work_directory, source_directory, ready_directory, final_parent
+
+    @staticmethod
+    def _ensure_real_directory(path: Path) -> None:
+        try:
+            path.mkdir(mode=0o750)
+        except FileExistsError:
+            pass
+        metadata = path.lstat()
+        if stat.S_ISLNK(metadata.st_mode) or not stat.S_ISDIR(metadata.st_mode):
+            raise RuntimeError(f"refusing unsafe export directory: {path}")
+
+    def _write_export_manifest(
+        self,
+        work_directory: Path,
+        *,
+        job_id: str,
+        mode: str,
+        filenames: list[str],
+    ) -> None:
+        if not filenames:
+            raise ValueError("export manifest must contain output filenames")
+        payload = json.dumps(
+            {
+                "version": 1,
+                "job_id": job_id,
+                "mode": mode,
+                "filenames": filenames,
+            },
+            ensure_ascii=False,
+            sort_keys=True,
+        )
+        temporary = work_directory / f".{EXPORT_MANIFEST_NAME}.tmp"
+        manifest = work_directory / EXPORT_MANIFEST_NAME
+        try:
+            with temporary.open("x", encoding="utf-8", newline="\n") as stream:
+                stream.write(payload + "\n")
+                stream.flush()
+                os.fsync(stream.fileno())
+            os.replace(temporary, manifest)
+            self._fsync_directory(work_directory)
+        finally:
+            temporary.unlink(missing_ok=True)
+
+    @staticmethod
+    def _export_source_files(source_directory: Path, mode: str) -> list[Path]:
+        allowed = (
+            VIDEO_EXPORT_INPUT_EXTENSIONS
+            if mode == "mp4"
+            else frozenset({EXPORT_AUDIO_EXTENSIONS[mode]})
+        )
+        media: list[Path] = []
+        for candidate in source_directory.iterdir():
+            if candidate.is_symlink() or not candidate.is_file():
+                raise RuntimeError(
+                    f"yt-dlp produced an unsafe export entry: {candidate.name}"
+                )
+            if candidate.suffix.lower() not in allowed:
+                raise RuntimeError(
+                    f"yt-dlp produced an unexpected export file: {candidate.name}"
+                )
+            media.append(candidate)
+        return sorted(media, key=lambda path: path.name.casefold())
+
+    def _inspect_media(self, path: Path) -> MediaInspection:
+        result = self._run_command(
+            [
+                "ffprobe",
+                "-v",
+                "error",
+                "-show_streams",
+                "-show_format",
+                "-of",
+                "json",
+                str(path),
+            ],
+            check=True,
+            capture_output=True,
+            text=True,
+            timeout=min(120.0, self.config.downloads.process_timeout_seconds),
+        )
+        try:
+            payload = json.loads(result.stdout or "")
+            streams = payload["streams"]
+            format_name = payload["format"]["format_name"]
+        except (KeyError, TypeError, ValueError, json.JSONDecodeError) as exc:
+            raise RuntimeError("ffprobe returned invalid media metadata") from exc
+        if not isinstance(streams, list) or not isinstance(format_name, str):
+            raise RuntimeError("ffprobe returned invalid media metadata")
+        video = next(
+            (
+                stream
+                for stream in streams
+                if isinstance(stream, dict) and stream.get("codec_type") == "video"
+            ),
+            None,
+        )
+        audio = next(
+            (
+                stream
+                for stream in streams
+                if isinstance(stream, dict) and stream.get("codec_type") == "audio"
+            ),
+            None,
+        )
+
+        def positive_integer(value: Any) -> int | None:
+            return (
+                value
+                if isinstance(value, int)
+                and not isinstance(value, bool)
+                and value > 0
+                else None
+            )
+
+        return MediaInspection(
+            format_names=frozenset(
+                value.strip().lower()
+                for value in format_name.split(",")
+                if value.strip()
+            ),
+            video_codec=(
+                video.get("codec_name") if isinstance(video, dict) else None
+            ),
+            audio_codec=(
+                audio.get("codec_name") if isinstance(audio, dict) else None
+            ),
+            pixel_format=(
+                video.get("pix_fmt") if isinstance(video, dict) else None
+            ),
+            width=positive_integer(video.get("width") if isinstance(video, dict) else None),
+            height=positive_integer(video.get("height") if isinstance(video, dict) else None),
+        )
+
+    def _produce_compatible_mp4(self, source: Path, output: Path) -> None:
+        source_info = self._inspect_media(source)
+        if source_info.video_codec is None or source_info.audio_codec is None:
+            raise RuntimeError("MP4 export requires both video and audio")
+        if source_info.height is None:
+            raise RuntimeError("MP4 export source has no verifiable video height")
+        if source_info.height > self.config.downloads.export_max_height:
+            raise RuntimeError("MP4 export source exceeds configured maximum height")
+        video_compatible = (
+            source_info.video_codec == "h264"
+            and source_info.pixel_format in {"yuv420p", "yuvj420p"}
+        )
+        audio_compatible = source_info.audio_codec == "aac"
+        container_compatible = "mp4" in source_info.format_names
+        if video_compatible and audio_compatible and container_compatible:
+            os.replace(source, output)
+        else:
+            temporary = output.with_name(
+                f".{output.stem}.{uuid.uuid4().hex}.tmp.mp4"
+            )
+            arguments = [
+                "ffmpeg",
+                "-nostdin",
+                "-hide_banner",
+                "-loglevel",
+                "error",
+                "-n",
+                "-i",
+                str(source),
+                "-map",
+                "0:v:0",
+                "-map",
+                "0:a:0",
+                "-map_metadata",
+                "0",
+            ]
+            if video_compatible:
+                arguments.extend(("-c:v", "copy"))
+            else:
+                arguments.extend(
+                    (
+                        "-c:v",
+                        "libx264",
+                        "-preset",
+                        "medium",
+                        "-crf",
+                        "18",
+                        "-pix_fmt",
+                        "yuv420p",
+                    )
+                )
+            if audio_compatible:
+                arguments.extend(("-c:a", "copy"))
+            else:
+                arguments.extend(("-c:a", "aac", "-b:a", "192k"))
+            arguments.extend(("-movflags", "+faststart", str(temporary)))
+            try:
+                self._run_command(
+                    arguments,
+                    check=True,
+                    text=True,
+                    timeout=self.config.downloads.process_timeout_seconds,
+                )
+                converted = self._inspect_media(temporary)
+                self._validate_compatible_mp4(converted, source_info.height)
+                os.replace(temporary, output)
+            finally:
+                temporary.unlink(missing_ok=True)
+        self._validate_compatible_mp4(
+            self._inspect_media(output),
+            source_info.height,
+        )
+
+    def _validate_compatible_mp4(
+        self,
+        inspection: MediaInspection,
+        source_height: int,
+    ) -> None:
+        if (
+            "mp4" not in inspection.format_names
+            or inspection.video_codec != "h264"
+            or inspection.audio_codec != "aac"
+            or inspection.pixel_format not in {"yuv420p", "yuvj420p"}
+        ):
+            raise RuntimeError("MP4 compatibility verification failed")
+        if (
+            inspection.height != source_height
+            or inspection.height > self.config.downloads.export_max_height
+        ):
+            raise RuntimeError("MP4 export resolution verification failed")
+
+    @staticmethod
+    def _validate_audio_export(
+        inspection: MediaInspection,
+        mode: str,
+    ) -> None:
+        expected_codec = "aac" if mode == "m4a" else "mp3"
+        expected_container = "mp4" if mode == "m4a" else "mp3"
+        if inspection.video_codec is not None:
+            raise RuntimeError("audio export unexpectedly contains video")
+        if inspection.audio_codec != expected_codec:
+            raise RuntimeError(f"{mode.upper()} export codec verification failed")
+        if expected_container not in inspection.format_names:
+            raise RuntimeError(f"{mode.upper()} export container verification failed")
+
+    @staticmethod
+    def _fsync_file(path: Path) -> None:
+        descriptor = os.open(path, os.O_RDONLY)
+        try:
+            os.fsync(descriptor)
+        finally:
+            os.close(descriptor)
+
+    def _remove_export_work_directory(self, path: Path) -> None:
+        try:
+            parent = path.parent
+            if os.path.lexists(path):
+                if path.is_symlink() or path.is_file():
+                    path.unlink()
+                else:
+                    shutil.rmtree(path)
+                self._fsync_directory(parent)
+        except OSError:
+            LOG.exception("could not remove export work directory %s", path)
+
+    def reconcile_export_artifacts(self) -> None:
+        """Recover verified crash-published exports and discard incomplete staging."""
+
+        export_root = self.config.storage.media_base / self.config.downloads.export_directory
+        if not os.path.lexists(export_root):
+            return
+        try:
+            self._verify_existing_export_tree(export_root)
+        except OSError as exc:
+            LOG.error("could not inspect utility export tree: %s", exc)
+            return
+        except RuntimeError as exc:
+            LOG.error("utility export reconciliation refused unsafe storage: %s", exc)
+            return
+
+        jobs = {
+            job.job_id: job for job in self.store.list_reconcilable_export_jobs()
+        }
+        for job in jobs.values():
+            try:
+                self._reconcile_export_job(export_root, job.job_id, job.mode)
+            except BaseException:
+                LOG.exception("could not reconcile utility export %s", job.job_id)
+
+        work_root = export_root / ".work"
+        if not work_root.is_dir() or work_root.is_symlink():
+            return
+        for candidate in work_root.iterdir():
+            if not re.fullmatch(r"[0-9a-f]{32}", candidate.name):
+                LOG.warning("leaving unknown utility export staging entry %s", candidate)
+                continue
+            job = self.store.get_export_job(candidate.name)
+            if job is None:
+                LOG.warning("leaving untracked utility export staging entry %s", candidate)
+                continue
+            if job.status == "completed":
+                self._remove_export_work_directory(candidate)
+            elif job.job_id not in jobs:
+                LOG.warning(
+                    "leaving utility export staging for active job %s",
+                    candidate.name,
+                )
+
+    def _verify_existing_export_tree(self, export_root: Path) -> None:
+        current = self.config.storage.media_base
+        for part in self.config.downloads.export_directory.parts:
+            current = current / part
+            metadata = current.lstat()
+            if stat.S_ISLNK(metadata.st_mode) or not stat.S_ISDIR(metadata.st_mode):
+                raise RuntimeError(f"unsafe export directory: {current}")
+        for child_name in (".work", "video", "audio"):
+            child = export_root / child_name
+            if not os.path.lexists(child):
+                continue
+            metadata = child.lstat()
+            if stat.S_ISLNK(metadata.st_mode) or not stat.S_ISDIR(metadata.st_mode):
+                raise RuntimeError(f"unsafe export directory: {child}")
+
+    def _reconcile_export_job(
+        self,
+        export_root: Path,
+        job_id: str,
+        mode: str,
+    ) -> None:
+        work_directory = export_root / ".work" / job_id
+        final_parent = export_root / ("video" if mode == "mp4" else "audio")
+        final_directory = final_parent / job_id
+        if os.path.lexists(work_directory):
+            work_metadata = work_directory.lstat()
+            if stat.S_ISLNK(work_metadata.st_mode) or not stat.S_ISDIR(
+                work_metadata.st_mode
+            ):
+                raise RuntimeError("utility export staging directory is unsafe")
+        manifest = self._read_export_manifest(work_directory, job_id, mode)
+
+        if os.path.lexists(final_directory):
+            filenames = None if manifest is None else manifest
+            outputs = self._validate_export_output_directory(
+                final_directory,
+                mode,
+                expected_filenames=filenames,
+            )
+        elif manifest is not None:
+            ready_directory = work_directory / "ready"
+            outputs = self._validate_export_output_directory(
+                ready_directory,
+                mode,
+                expected_filenames=manifest,
+            )
+            self._ensure_real_directory(final_parent)
+            os.rename(ready_directory, final_directory)
+            self._fsync_directory(final_parent)
+        else:
+            if os.path.lexists(work_directory):
+                self._remove_export_work_directory(work_directory)
+            return
+
+        media_base = self.config.storage.media_base.resolve()
+        output_paths = tuple(
+            str((final_directory / output.name).resolve().relative_to(media_base))
+            for output in outputs
+        )
+        if self.store.recover_export_job(job_id, output_paths):
+            LOG.warning("recovered crash-published utility export %s", job_id)
+            if os.path.lexists(work_directory):
+                self._remove_export_work_directory(work_directory)
+
+    @staticmethod
+    def _read_export_manifest(
+        work_directory: Path,
+        job_id: str,
+        mode: str,
+    ) -> list[str] | None:
+        manifest = work_directory / EXPORT_MANIFEST_NAME
+        if not manifest.is_file() or manifest.is_symlink():
+            return None
+        if manifest.stat().st_size > 8 * 1024 * 1024:
+            raise RuntimeError("utility export manifest is too large")
+        try:
+            payload = json.loads(manifest.read_text(encoding="utf-8"))
+        except (OSError, UnicodeError, json.JSONDecodeError) as exc:
+            raise RuntimeError("utility export manifest is invalid") from exc
+        if (
+            not isinstance(payload, dict)
+            or payload.get("version") != 1
+            or payload.get("job_id") != job_id
+            or payload.get("mode") != mode
+        ):
+            raise RuntimeError("utility export manifest identity is invalid")
+        filenames = payload.get("filenames")
+        if not isinstance(filenames, list) or not filenames or len(filenames) > 10000:
+            raise RuntimeError("utility export manifest filenames are invalid")
+        expected_extension = ".mp4" if mode == "mp4" else EXPORT_AUDIO_EXTENSIONS[mode]
+        normalized: list[str] = []
+        for filename in filenames:
+            if (
+                not isinstance(filename, str)
+                or not filename
+                or Path(filename).name != filename
+                or Path(filename).suffix.lower() != expected_extension
+            ):
+                raise RuntimeError("utility export manifest contains an unsafe filename")
+            normalized.append(filename)
+        if len({value.casefold() for value in normalized}) != len(normalized):
+            raise RuntimeError("utility export manifest contains duplicate filenames")
+        return normalized
+
+    def _validate_export_output_directory(
+        self,
+        directory: Path,
+        mode: str,
+        *,
+        expected_filenames: list[str] | None,
+    ) -> list[Path]:
+        metadata = directory.lstat()
+        if stat.S_ISLNK(metadata.st_mode) or not stat.S_ISDIR(metadata.st_mode):
+            raise RuntimeError("utility export output directory is unsafe")
+        outputs = sorted(directory.iterdir(), key=lambda path: path.name.casefold())
+        if not outputs:
+            raise RuntimeError("utility export output directory is empty")
+        if expected_filenames is not None and {
+            path.name for path in outputs
+        } != set(expected_filenames):
+            raise RuntimeError("utility export output does not match its manifest")
+        expected_extension = ".mp4" if mode == "mp4" else EXPORT_AUDIO_EXTENSIONS[mode]
+        for output in outputs:
+            if (
+                output.is_symlink()
+                or not output.is_file()
+                or output.suffix.lower() != expected_extension
+            ):
+                raise RuntimeError("utility export output contains an unsafe entry")
+            inspection = self._inspect_media(output)
+            if mode == "mp4":
+                if inspection.height is None:
+                    raise RuntimeError("MP4 export output has no verifiable height")
+                self._validate_compatible_mp4(inspection, inspection.height)
+            else:
+                self._validate_audio_export(inspection, mode)
+        return outputs
+
     @staticmethod
     def _failure_message(exc: BaseException) -> str:
+        command = getattr(exc, "cmd", None)
+        program = "media command"
+        if isinstance(command, (list, tuple)) and command:
+            program = Path(str(command[0])).name
         if isinstance(exc, subprocess.TimeoutExpired):
-            return f"yt-dlp timed out after {exc.timeout} seconds"
+            return f"{program} timed out after {exc.timeout} seconds"
         if isinstance(exc, subprocess.CalledProcessError):
-            return f"yt-dlp failed with exit code {exc.returncode}"
+            return f"{program} failed with exit code {exc.returncode}"
         return f"download failed: {exc}"
 
     def _run_command(
@@ -708,6 +1470,8 @@ class DownloadManager:
                 self._terminate_process(process, force=True)
         if self._owns_executor:
             self._executor.shutdown(wait=wait, cancel_futures=True)
+        if self._owns_export_executor:
+            self._export_executor.shutdown(wait=wait, cancel_futures=True)
 
     def active_future_count(self) -> int:
         with self._lock:

controller/service.py

@@ -148,6 +148,12 @@ class ControllerService:
                         self.store,
                         on_event=self._queue_download_event,
                     )
+                try:
+                    self.downloads.reconcile_export_artifacts()
+                except BaseException:
+                    LOG.exception(
+                        "utility export reconciliation failed; Controller startup continues"
+                    )
                 # Cleanup is deliberately deferred until fresh Player evidence
                 # (or an explicit administrative reconciliation) makes it safe.
                 self._reset_cleanup_evidence()
@@ -252,6 +258,26 @@ class ControllerService:
             {"url": url, "submitter": submitter, "note": note},
         )
 
+    def enqueue_export(
+        self,
+        url: str,
+        mode: str,
+        submitter: str | None,
+        note: str | None,
+    ) -> dict[str, Any]:
+        return self._call(
+            "enqueue_export",
+            {
+                "url": url,
+                "mode": mode,
+                "submitter": submitter,
+                "note": note,
+            },
+        )
+
+    def list_export_jobs(self, *, limit: int = 10) -> list[dict[str, Any]]:
+        return self._call("list_export_jobs", {"limit": limit})
+
     def submit_control(self, payload: Mapping[str, Any]) -> dict[str, Any]:
         return self._call("control", dict(payload))
 
@@ -403,6 +429,35 @@ class ControllerService:
             self._handle_mqtt_event(event)
 
     def _handle_call(self, action: str, payload: Any) -> Any:
+        if action == "enqueue_export":
+            assert self.downloads is not None
+            reservation = self.downloads.enqueue_export(
+                payload["url"],
+                payload["mode"],
+                payload.get("submitter"),
+                payload.get("note"),
+            )
+            return {
+                "kind": "export",
+                "status": reservation.status,
+                "job_id": reservation.job_id,
+                "mode": payload["mode"],
+            }
+        if action == "list_export_jobs":
+            jobs = self.store.list_export_jobs(limit=payload["limit"])
+            return [
+                {
+                    "job_id": job.job_id,
+                    "mode": job.mode,
+                    "url": job.url,
+                    "status": job.status,
+                    "requested_at": job.requested_at,
+                    "finished_at": job.finished_at,
+                    "output_paths": list(job.output_paths),
+                    "error": job.error,
+                }
+                for job in jobs
+            ]
         if action == "enqueue_download":
             assert self.downloads is not None
             url = payload["url"]

controller/store.py

@@ -1312,6 +1312,47 @@ class ControllerStore:
                 ).rowcount
             )
 
+    def recover_export_job(
+        self,
+        job_id: str,
+        output_paths: Sequence[str],
+    ) -> bool:
+        """Record a fully verified export found during restart reconciliation."""
+
+        normalized = tuple(output_paths)
+        if not normalized or any(
+            not isinstance(path, str) or not path for path in normalized
+        ):
+            raise ValueError("recovered export must contain output paths")
+        with self._transaction() as connection:
+            now = self._now()
+            updated = connection.execute(
+                """
+                UPDATE export_jobs
+                SET status = 'completed', finished_at = ?,
+                    output_paths_json = ?, error = NULL
+                WHERE job_id = ?
+                  AND status IN ('queued','running','failed','interrupted')
+                """,
+                (now, json.dumps(normalized), job_id),
+            ).rowcount
+            if updated:
+                connection.execute(
+                    """
+                    INSERT INTO audit_events
+                        (occurred_at, event_type, actor, details_json)
+                    VALUES (?, 'utility_export_recovered', 'startup', ?)
+                    """,
+                    (
+                        now,
+                        json.dumps(
+                            {"job_id": job_id, "output_paths": normalized},
+                            sort_keys=True,
+                        ),
+                    ),
+                )
+            return bool(updated)
+
     def get_export_job(self, job_id: str) -> ExportJob | None:
         with self._lock:
             row = self.connection.execute(
@@ -1326,12 +1367,27 @@ class ControllerStore:
             rows = self.connection.execute(
                 """
                 SELECT * FROM export_jobs
-                ORDER BY requested_at DESC, job_id DESC LIMIT ?
+                ORDER BY
+                    CASE WHEN status IN ('queued','running') THEN 0 ELSE 1 END,
+                    requested_at DESC,
+                    job_id DESC
+                LIMIT ?
                 """,
                 (limit,),
             ).fetchall()
             return [self._row_to_export_job(row) for row in rows]
 
+    def list_reconcilable_export_jobs(self) -> list[ExportJob]:
+        with self._lock:
+            rows = self.connection.execute(
+                """
+                SELECT * FROM export_jobs
+                WHERE status IN ('failed','interrupted')
+                ORDER BY requested_at, job_id
+                """
+            ).fetchall()
+            return [self._row_to_export_job(row) for row in rows]
+
     def protect_slot(
         self,
         slot: int,

tests/test_app.py

@@ -14,7 +14,14 @@ from controller.service import ControllerService, ControllerUnavailableError
 
 
 class FakeControllerService:
-    def __init__(self, *, enqueue_result=None, enqueue_error=None, health=None):
+    def __init__(
+        self,
+        *,
+        enqueue_result=None,
+        enqueue_error=None,
+        health=None,
+        export_jobs=None,
+    ):
         self.enqueue_result = enqueue_result or {
             "status": "queued",
             "slot": 3,
@@ -29,7 +36,9 @@ class FakeControllerService:
             "router_state": "video",
             "degraded_reasons": [],
         }
+        self.export_jobs = list(export_jobs or [])
         self.enqueue_calls = []
+        self.export_calls = []
 
     def enqueue_download(self, url, submitter, note):
         self.enqueue_calls.append((url, submitter, note))
@@ -37,6 +46,20 @@ class FakeControllerService:
             raise self.enqueue_error
         return dict(self.enqueue_result)
 
+    def enqueue_export(self, url, mode, submitter, note):
+        self.export_calls.append((url, mode, submitter, note))
+        if self.enqueue_error is not None:
+            raise self.enqueue_error
+        return {
+            "kind": "export",
+            "status": "queued",
+            "job_id": "export-job",
+            "mode": mode,
+        }
+
+    def list_export_jobs(self, *, limit=10):
+        return [dict(job) for job in self.export_jobs[:limit]]
+
     def health(self):
         return dict(self.health_result)
 
@@ -71,11 +94,94 @@ class FlaskFactoryTests(unittest.TestCase):
         response = self._app(FakeControllerService()).test_client().get("/")
 
         self.assertEqual(response.status_code, 200)
-        self.assertIn(b"Submit YouTube Playlist", response.data)
+        self.assertIn(b"Submit YouTube Media", response.data)
         self.assertIn(b'action="/submit"', response.data)
         self.assertIn(b'name="url"', response.data)
         self.assertIn(b'name="submitter"', response.data)
         self.assertIn(b'name="note"', response.data)
+        self.assertIn(b'name="download_mode"', response.data)
+        self.assertIn(b'value="player_slot" checked', response.data)
+        self.assertIn(b"MP4 Export", response.data)
+        self.assertIn(b"M4A Audio", response.data)
+        self.assertIn(b"MP3 Audio", response.data)
+
+    def test_older_clients_omitting_mode_still_use_player_slot(self):
+        service = FakeControllerService()
+
+        response = self._post(service, submitter=" Alice ")
+
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(
+            service.enqueue_calls,
+            [("https://www.youtube.com/playlist?list=PL1234567890", "Alice", None)],
+        )
+        self.assertEqual(service.export_calls, [])
+
+    def test_each_utility_mode_uses_export_path_without_player_slot(self):
+        for mode, label in (
+            ("mp4", b"MP4 Export queued"),
+            ("m4a", b"M4A Audio queued"),
+            ("mp3", b"MP3 Audio queued"),
+        ):
+            with self.subTest(mode=mode):
+                service = FakeControllerService()
+                response = self._post(
+                    service,
+                    download_mode=mode,
+                    submitter="Operator",
+                    note="Utility",
+                )
+                self.assertEqual(response.status_code, 200)
+                self.assertIn(label, response.data)
+                self.assertEqual(service.enqueue_calls, [])
+                self.assertEqual(
+                    service.export_calls,
+                    [
+                        (
+                            "https://www.youtube.com/playlist?list=PL1234567890",
+                            mode,
+                            "Operator",
+                            "Utility",
+                        )
+                    ],
+                )
+
+    def test_invalid_download_mode_is_rejected_server_side(self):
+        service = FakeControllerService()
+
+        response = self._post(service, download_mode="../../slot1")
+
+        self.assertEqual(response.status_code, 200)
+        self.assertIn(b"Invalid download type", response.data)
+        self.assertEqual(service.enqueue_calls, [])
+        self.assertEqual(service.export_calls, [])
+
+    def test_recent_export_status_shows_results_and_failures(self):
+        service = FakeControllerService(
+            export_jobs=[
+                {
+                    "job_id": "one",
+                    "mode": "mp4",
+                    "status": "completed",
+                    "output_paths": ["exports/video/one/Service.mp4"],
+                    "error": None,
+                },
+                {
+                    "job_id": "two",
+                    "mode": "mp3",
+                    "status": "failed",
+                    "output_paths": [],
+                    "error": "ffmpeg failed",
+                },
+            ]
+        )
+
+        response = self._app(service).test_client().get("/")
+
+        self.assertEqual(response.status_code, 200)
+        self.assertIn(b"Recent utility exports", response.data)
+        self.assertIn(b"exports/video/one/Service.mp4", response.data)
+        self.assertIn(b"ffmpeg failed", response.data)
 
     def test_submit_rejects_non_youtube_and_malformed_urls(self):
         invalid_urls = (

tests/test_config_contracts.py

@@ -84,6 +84,7 @@ class ConfigurationTests(unittest.TestCase):
         self.assertEqual(config.mqtt.router_echo_grace_seconds, 2.0)
         self.assertEqual(config.downloads.export_directory, Path("exports"))
         self.assertEqual(config.downloads.export_max_height, 1080)
+        self.assertEqual(config.downloads.export_max_workers, 1)
         self.assertEqual(config.downloads.max_queued_exports, 20)
 
     def test_documented_environment_overrides_apply(self):
@@ -190,9 +191,23 @@ class ConfigurationTests(unittest.TestCase):
                 with self.assertRaisesRegex(ConfigError, "safe relative directory"):
                     load_config(path, environ={})
 
+    def test_export_directory_cannot_overlap_player_slot_storage(self):
+        invalid = ("slot1", "SLOT10/exports", ".controller-trash/exports")
+        for value in invalid:
+            with self.subTest(value=value), tempfile.TemporaryDirectory() as directory:
+                path = Path(directory) / "config.yaml"
+                path.write_text(
+                    f"downloads:\n  export_directory: {value!r}\n",
+                    encoding="utf-8",
+                )
+                with self.assertRaisesRegex(ConfigError, "slot storage"):
+                    load_config(path, environ={})
+
     def test_export_limits_are_bounded_positive_integers(self):
         cases = (
             ("export_max_height", 0),
+            ("export_max_workers", 0),
+            ("export_max_workers", 11),
             ("max_queued_exports", 0),
             ("max_queued_exports", 1001),
         )

tests/test_exports.py

@@ -0,0 +1,625 @@
+import json
+import subprocess
+import tempfile
+import unittest
+from concurrent.futures import Future
+from pathlib import Path
+
+from yt_dlp import YoutubeDL
+
+from controller.config import ControllerConfig, DownloadConfig, StorageConfig
+from controller.downloads import (
+    DownloadManager,
+    mp4_export_format_selector,
+    safe_export_filename,
+)
+from controller.store import ControllerStore
+
+
+class ImmediateExecutor:
+    def submit(self, function, *args, **kwargs):
+        future = Future()
+        try:
+            future.set_result(function(*args, **kwargs))
+        except BaseException as exc:
+            future.set_exception(exc)
+        return future
+
+
+class QueuedExecutor:
+    def __init__(self):
+        self.calls = []
+
+    def submit(self, function, *args, **kwargs):
+        future = Future()
+        self.calls.append((future, function, args, kwargs))
+        return future
+
+
+class FakeExportRunner:
+    def __init__(
+        self,
+        *,
+        video_codec="h264",
+        audio_codec="aac",
+        pixel_format="yuv420p",
+        container="mp4",
+        height=1080,
+        playlist_items=1,
+        fail_download=False,
+    ):
+        self.video_codec = video_codec
+        self.audio_codec = audio_codec
+        self.pixel_format = pixel_format
+        self.container = container
+        self.height = height
+        self.playlist_items = playlist_items
+        self.fail_download = fail_download
+        self.calls = []
+
+    def __call__(self, arguments, **kwargs):
+        arguments = list(arguments)
+        self.calls.append((arguments, dict(kwargs)))
+        program = Path(arguments[0]).name
+        if program == "yt-dlp-test":
+            if self.fail_download:
+                raise subprocess.CalledProcessError(9, arguments)
+            template = Path(arguments[arguments.index("-o") + 1])
+            template.parent.mkdir(parents=True, exist_ok=True)
+            if "--audio-format" in arguments:
+                extension = "." + arguments[arguments.index("--audio-format") + 1]
+            else:
+                extension = {
+                    "mp4": ".mp4",
+                    "matroska": ".mkv",
+                    "webm": ".webm",
+                }[self.container]
+            for index in range(1, self.playlist_items + 1):
+                (template.parent / f"{index:03d} - Tést Item {index} [id{index}]{extension}").write_bytes(
+                    f"source-{index}".encode()
+                )
+            return subprocess.CompletedProcess(arguments, 0, stdout="", stderr="")
+        if program == "ffmpeg":
+            Path(arguments[-1]).write_bytes(b"converted")
+            return subprocess.CompletedProcess(arguments, 0, stdout="", stderr="")
+        if program == "ffprobe":
+            path = Path(arguments[-1])
+            converted = path.is_file() and path.read_bytes() == b"converted"
+            if path.suffix == ".m4a":
+                payload = {
+                    "streams": [{"codec_type": "audio", "codec_name": "aac"}],
+                    "format": {"format_name": "mov,mp4,m4a,3gp,3g2,mj2"},
+                }
+            elif path.suffix == ".mp3":
+                payload = {
+                    "streams": [{"codec_type": "audio", "codec_name": "mp3"}],
+                    "format": {"format_name": "mp3"},
+                }
+            else:
+                payload = {
+                    "streams": [
+                        {
+                            "codec_type": "video",
+                            "codec_name": "h264" if converted else self.video_codec,
+                            "pix_fmt": "yuv420p" if converted else self.pixel_format,
+                            "width": 1920 if self.height == 1080 else 1280,
+                            "height": self.height,
+                        },
+                        {
+                            "codec_type": "audio",
+                            "codec_name": "aac" if converted else self.audio_codec,
+                        },
+                    ],
+                    "format": {
+                        "format_name": "mov,mp4,m4a,3gp,3g2,mj2"
+                        if converted or self.container == "mp4"
+                        else self.container
+                    },
+                }
+            return subprocess.CompletedProcess(
+                arguments,
+                0,
+                stdout=json.dumps(payload),
+                stderr="",
+            )
+        raise AssertionError(f"unexpected command: {arguments!r}")
+
+    @property
+    def yt_dlp_calls(self):
+        return [arguments for arguments, _ in self.calls if Path(arguments[0]).name == "yt-dlp-test"]
+
+    @property
+    def ffmpeg_calls(self):
+        return [arguments for arguments, _ in self.calls if Path(arguments[0]).name == "ffmpeg"]
+
+
+class UtilityExportTests(unittest.TestCase):
+    def setUp(self):
+        self.tempdir = tempfile.TemporaryDirectory()
+        base = Path(self.tempdir.name)
+        self.media = base / "media"
+        self.data = base / "data"
+        self.config = ControllerConfig(
+            storage=StorageConfig(media_base=self.media, data_base=self.data),
+            downloads=DownloadConfig(
+                yt_dlp_binary="yt-dlp-test",
+                cookie_path=None,
+                max_workers=1,
+                process_timeout_seconds=30,
+                max_height=1080,
+                export_directory=Path("exports"),
+                export_max_height=1080,
+                max_queued_exports=5,
+            ),
+        )
+        self.store = ControllerStore(self.config.storage).open()
+
+    def tearDown(self):
+        self.store.close()
+        self.tempdir.cleanup()
+
+    def manager(self, runner, events=None):
+        return DownloadManager(
+            self.config,
+            self.store,
+            runner=runner,
+            executor=ImmediateExecutor(),
+            export_executor=ImmediateExecutor(),
+            on_event=(events if events is not None else []).append,
+        )
+
+    def assert_player_slots_empty(self):
+        self.assertTrue(
+            all(slot.media_state == "empty" for slot in self.store.list_slots())
+        )
+
+    def test_compatible_mp4_exports_without_slot_or_transcode(self):
+        events = []
+        runner = FakeExportRunner()
+        result = self.manager(runner, events).enqueue_export(
+            "https://www.youtube.com/watch?v=one", "mp4", "Alice", "Slides"
+        )
+
+        self.assertEqual(result.status, "queued")
+        job = self.store.get_export_job(result.job_id)
+        self.assertEqual(job.status, "completed")
+        self.assertEqual(len(job.output_paths), 1)
+        self.assertTrue(job.output_paths[0].startswith(f"exports/video/{result.job_id}/"))
+        self.assertTrue(job.output_paths[0].endswith(".mp4"))
+        self.assertTrue((self.media / job.output_paths[0]).is_file())
+        self.assertEqual(events, [])
+        self.assertEqual(runner.ffmpeg_calls, [])
+        self.assert_player_slots_empty()
+
+        arguments = runner.yt_dlp_calls[0]
+        self.assertIn("--yes-playlist", arguments)
+        self.assertIn("--windows-filenames", arguments)
+        self.assertIn("--no-overwrites", arguments)
+        self.assertEqual(
+            arguments[arguments.index("-f") + 1],
+            "bv*[height<=1080]+ba/b[height<=1080]",
+        )
+        self.assertEqual(
+            arguments[arguments.index("-S") + 1],
+            "res:1080,vcodec:h264,acodec:aac",
+        )
+
+    def test_incompatible_mp4_transcodes_only_incompatible_codecs(self):
+        runner = FakeExportRunner(
+            video_codec="vp9",
+            audio_codec="opus",
+            pixel_format="yuv420p",
+            container="webm",
+        )
+        result = self.manager(runner).enqueue_export(
+            "https://www.youtube.com/watch?v=vp9", "mp4", None, None
+        )
+
+        self.assertEqual(self.store.get_export_job(result.job_id).status, "completed")
+        self.assertEqual(len(runner.ffmpeg_calls), 1)
+        arguments = runner.ffmpeg_calls[0]
+        self.assertIn("libx264", arguments)
+        self.assertIn("-crf", arguments)
+        self.assertEqual(arguments[arguments.index("-crf") + 1], "18")
+        self.assertIn("yuv420p", arguments)
+        self.assertIn("aac", arguments)
+        self.assertIn("192k", arguments)
+        self.assertNotIn("-vf", arguments)
+        self.assertNotIn("scale", " ".join(arguments))
+        self.assert_player_slots_empty()
+
+    def test_compatible_h264_aac_in_other_container_is_remuxed_only(self):
+        runner = FakeExportRunner(container="matroska")
+        result = self.manager(runner).enqueue_export(
+            "https://www.youtube.com/watch?v=mkv", "mp4", None, None
+        )
+
+        self.assertEqual(self.store.get_export_job(result.job_id).status, "completed")
+        arguments = runner.ffmpeg_calls[0]
+        self.assertEqual(arguments[arguments.index("-c:v") + 1], "copy")
+        self.assertEqual(arguments[arguments.index("-c:a") + 1], "copy")
+        self.assertNotIn("libx264", arguments)
+
+    def test_lower_resolution_mp4_is_preserved_without_scaling(self):
+        runner = FakeExportRunner(height=720)
+        result = self.manager(runner).enqueue_export(
+            "https://www.youtube.com/watch?v=720", "mp4", None, None
+        )
+
+        self.assertEqual(self.store.get_export_job(result.job_id).status, "completed")
+        self.assertEqual(runner.ffmpeg_calls, [])
+
+    def test_over_height_mp4_is_rejected_even_if_downloader_misbehaves(self):
+        runner = FakeExportRunner(height=2160)
+        result = self.manager(runner).enqueue_export(
+            "https://www.youtube.com/watch?v=2160", "mp4", None, None
+        )
+
+        job = self.store.get_export_job(result.job_id)
+        self.assertEqual(job.status, "failed")
+        self.assertIn("maximum height", job.error)
+        self.assertFalse((self.media / "exports" / "video" / result.job_id).exists())
+        self.assert_player_slots_empty()
+
+    def test_audio_exports_use_intentional_audio_only_strategies(self):
+        for mode, expected_selector in (
+            ("m4a", "ba/b"),
+            ("mp3", "ba/b"),
+        ):
+            with self.subTest(mode=mode):
+                events = []
+                runner = FakeExportRunner()
+                result = self.manager(runner, events).enqueue_export(
+                    f"https://www.youtube.com/watch?v={mode}", mode, None, None
+                )
+                job = self.store.get_export_job(result.job_id)
+                self.assertEqual(job.status, "completed")
+                self.assertEqual(len(job.output_paths), 1)
+                self.assertTrue(job.output_paths[0].endswith(f".{mode}"))
+                arguments = runner.yt_dlp_calls[0]
+                self.assertEqual(arguments[arguments.index("-f") + 1], expected_selector)
+                self.assertIn("-x", arguments)
+                self.assertEqual(
+                    arguments[arguments.index("--audio-format") + 1], mode
+                )
+                self.assertEqual(
+                    arguments[arguments.index("--audio-quality") + 1], "0"
+                )
+                if mode == "m4a":
+                    self.assertEqual(
+                        arguments[arguments.index("-S") + 1],
+                        "abr,acodec:aac",
+                    )
+                self.assertEqual(runner.ffmpeg_calls, [])
+                self.assertEqual(events, [])
+        self.assert_player_slots_empty()
+
+    def test_playlist_items_publish_as_individual_collision_safe_files(self):
+        runner = FakeExportRunner(playlist_items=3)
+        result = self.manager(runner).enqueue_export(
+            "https://www.youtube.com/playlist?list=three", "m4a", None, None
+        )
+
+        job = self.store.get_export_job(result.job_id)
+        self.assertEqual(job.status, "completed")
+        self.assertEqual(len(job.output_paths), 3)
+        self.assertEqual(len(set(job.output_paths)), 3)
+        self.assertTrue(all((self.media / path).is_file() for path in job.output_paths))
+
+    def test_export_failure_and_expiry_never_mutate_player_or_export_files(self):
+        slot_one = self.media / "slot1"
+        slot_one.mkdir(parents=True)
+        protected_file = slot_one / "active.mp4"
+        protected_file.write_bytes(b"active")
+        failed = self.manager(FakeExportRunner(fail_download=True)).enqueue_export(
+            "https://www.youtube.com/watch?v=fail", "mp3", None, None
+        )
+        self.assertEqual(self.store.get_export_job(failed.job_id).status, "failed")
+        self.assertEqual(protected_file.read_bytes(), b"active")
+        self.assert_player_slots_empty()
+
+        completed = self.manager(FakeExportRunner()).enqueue_export(
+            "https://www.youtube.com/watch?v=keep", "m4a", None, None
+        )
+        export_path = self.media / self.store.get_export_job(completed.job_id).output_paths[0]
+        self.manager(FakeExportRunner()).expire_due_slots()
+        self.assertTrue(export_path.is_file())
+        self.assertEqual(protected_file.read_bytes(), b"active")
+
+    def test_symlinked_export_root_cannot_redirect_into_player_slot(self):
+        slot_one = self.media / "slot1"
+        slot_one.mkdir(parents=True)
+        protected_file = slot_one / "active.mp4"
+        protected_file.write_bytes(b"active")
+        (self.media / "exports").symlink_to(slot_one, target_is_directory=True)
+
+        result = self.manager(FakeExportRunner()).enqueue_export(
+            "https://www.youtube.com/watch?v=escape", "m4a", None, None
+        )
+
+        self.assertEqual(self.store.get_export_job(result.job_id).status, "failed")
+        self.assertIn("unsafe export directory", self.store.get_export_job(result.job_id).error)
+        self.assertEqual(protected_file.read_bytes(), b"active")
+
+    def test_export_work_uses_dedicated_executor_capacity(self):
+        player_executor = QueuedExecutor()
+        export_executor = QueuedExecutor()
+        manager = DownloadManager(
+            self.config,
+            self.store,
+            runner=FakeExportRunner(),
+            executor=player_executor,
+            export_executor=export_executor,
+        )
+
+        manager.enqueue_export(
+            "https://www.youtube.com/watch?v=export", "mp4", None, None
+        )
+        manager.enqueue(
+            "https://www.youtube.com/watch?v=player", None, None
+        )
+
+        self.assertEqual(len(export_executor.calls), 1)
+        self.assertEqual(len(player_executor.calls), 1)
+
+    def test_restart_reconciles_published_export_and_cleans_manifest(self):
+        runner = FakeExportRunner()
+        manager = self.manager(runner)
+        job_id = "a" * 32
+        self.store.reserve_export_job(
+            "https://www.youtube.com/watch?v=recover",
+            "mp4",
+            None,
+            None,
+            max_active=5,
+            job_id=job_id,
+        )
+        self.store.mark_export_running(job_id)
+        self.store.fail_export_job(job_id, "database completion failed")
+        work = self.media / "exports" / ".work" / job_id
+        published = self.media / "exports" / "video" / job_id
+        work.mkdir(parents=True)
+        published.mkdir(parents=True)
+        filename = "Recovered.mp4"
+        (published / filename).write_bytes(b"compatible")
+        manager._write_export_manifest(
+            work,
+            job_id=job_id,
+            mode="mp4",
+            filenames=[filename],
+        )
+
+        manager.reconcile_export_artifacts()
+
+        job = self.store.get_export_job(job_id)
+        self.assertEqual(job.status, "completed")
+        self.assertEqual(
+            job.output_paths,
+            (f"exports/video/{job_id}/{filename}",),
+        )
+        self.assertFalse(work.exists())
+        self.assertTrue((published / filename).is_file())
+
+    def test_restart_atomically_publishes_manifested_ready_export(self):
+        runner = FakeExportRunner()
+        manager = self.manager(runner)
+        job_id = "b" * 32
+        self.store.reserve_export_job(
+            "https://www.youtube.com/watch?v=staged",
+            "m4a",
+            None,
+            None,
+            max_active=5,
+            job_id=job_id,
+        )
+        self.store.mark_export_running(job_id)
+        self.store.fail_export_job(job_id, "interrupted after conversion")
+        work = self.media / "exports" / ".work" / job_id
+        ready = work / "ready"
+        ready.mkdir(parents=True)
+        filename = "Recovered.m4a"
+        (ready / filename).write_bytes(b"aac")
+        manager._write_export_manifest(
+            work,
+            job_id=job_id,
+            mode="m4a",
+            filenames=[filename],
+        )
+
+        manager.reconcile_export_artifacts()
+
+        job = self.store.get_export_job(job_id)
+        output = self.media / job.output_paths[0]
+        self.assertEqual(job.status, "completed")
+        self.assertTrue(output.is_file())
+        self.assertFalse(work.exists())
+
+    def test_restart_discards_only_known_incomplete_export_staging(self):
+        manager = self.manager(FakeExportRunner())
+        job_id = "c" * 32
+        self.store.reserve_export_job(
+            "https://www.youtube.com/watch?v=incomplete",
+            "mp3",
+            None,
+            None,
+            max_active=5,
+            job_id=job_id,
+        )
+        self.store.fail_export_job(job_id, "interrupted download")
+        work = self.media / "exports" / ".work" / job_id
+        work.mkdir(parents=True)
+        (work / "partial.part").write_bytes(b"partial")
+        unknown = self.media / "exports" / ".work" / ("d" * 32)
+        unknown.mkdir()
+        (unknown / "operator-file").write_bytes(b"keep")
+
+        manager.reconcile_export_artifacts()
+
+        self.assertFalse(work.exists())
+        self.assertTrue((unknown / "operator-file").is_file())
+
+    def test_safe_filename_blocks_traversal_preserves_unicode_and_deduplicates(self):
+        used = set()
+        first = safe_export_filename(
+            "../../slot1/CON:Tést\x00?", ".mp4", used_casefolded=used
+        )
+        second = safe_export_filename(
+            "../../slot1/CON:Tést\x00?", ".mp4", used_casefolded=used
+        )
+        long_name = safe_export_filename("🎬" * 500, ".mp3")
+
+        self.assertNotIn("/", first)
+        self.assertNotIn("\\", first)
+        self.assertNotIn("..", Path(first).parts)
+        self.assertIn("Tést", first)
+        self.assertNotEqual(first.casefold(), second.casefold())
+        self.assertTrue(second.endswith(" (2).mp4"))
+        self.assertLessEqual(len(Path(long_name).stem.encode("utf-8")), 180)
+
+    def test_mp4_sorting_keeps_resolution_ahead_of_codec_preference(self):
+        formats = [
+            {
+                "format_id": "av1-1080",
+                "url": "https://example.test/av1",
+                "ext": "webm",
+                "height": 1080,
+                "width": 1920,
+                "vcodec": "av01.0.08M.08",
+                "acodec": "none",
+                "tbr": 4000,
+                "filesize": 1,
+            },
+            {
+                "format_id": "h264-720",
+                "url": "https://example.test/h264",
+                "ext": "mp4",
+                "height": 720,
+                "width": 1280,
+                "vcodec": "avc1.64001f",
+                "acodec": "none",
+                "tbr": 3000,
+                "filesize": 1,
+            },
+            {
+                "format_id": "aac",
+                "url": "https://example.test/aac",
+                "ext": "m4a",
+                "vcodec": "none",
+                "acodec": "mp4a.40.2",
+                "tbr": 128,
+                "filesize": 1,
+            },
+        ]
+        with YoutubeDL(
+            {
+                "quiet": True,
+                "format_sort": ["res:1080", "vcodec:h264", "acodec:aac"],
+            }
+        ) as ydl:
+            info = {"formats": formats}
+            ydl.sort_formats(info)
+            selector = ydl.build_format_selector(mp4_export_format_selector(1080))
+            selected = list(ydl._select_formats(info["formats"], selector))
+
+        self.assertEqual(selected[0]["height"], 1080)
+        self.assertEqual(selected[0]["requested_formats"][0]["format_id"], "av1-1080")
+
+    def test_mp4_sorting_prefers_native_h264_aac_at_equal_quality(self):
+        formats = [
+            {
+                "format_id": "vp9-1080",
+                "url": "https://example.test/vp9",
+                "ext": "webm",
+                "height": 1080,
+                "width": 1920,
+                "vcodec": "vp9",
+                "acodec": "none",
+                "tbr": 4200,
+                "filesize": 1,
+            },
+            {
+                "format_id": "h264-1080",
+                "url": "https://example.test/h264",
+                "ext": "mp4",
+                "height": 1080,
+                "width": 1920,
+                "vcodec": "avc1.640028",
+                "acodec": "none",
+                "tbr": 4000,
+                "filesize": 1,
+            },
+            {
+                "format_id": "opus",
+                "url": "https://example.test/opus",
+                "ext": "webm",
+                "vcodec": "none",
+                "acodec": "opus",
+                "tbr": 160,
+                "filesize": 1,
+            },
+            {
+                "format_id": "aac",
+                "url": "https://example.test/aac",
+                "ext": "m4a",
+                "vcodec": "none",
+                "acodec": "mp4a.40.2",
+                "tbr": 128,
+                "filesize": 1,
+            },
+        ]
+        with YoutubeDL(
+            {
+                "quiet": True,
+                "format_sort": ["res:1080", "vcodec:h264", "acodec:aac"],
+            }
+        ) as ydl:
+            info = {"formats": formats}
+            ydl.sort_formats(info)
+            selector = ydl.build_format_selector(mp4_export_format_selector(1080))
+            selected = list(ydl._select_formats(info["formats"], selector))
+
+        self.assertEqual(
+            [item["format_id"] for item in selected[0]["requested_formats"]],
+            ["h264-1080", "aac"],
+        )
+
+    def test_m4a_sorting_keeps_audio_quality_ahead_of_native_aac_preference(self):
+        formats = [
+            {
+                "format_id": "aac-low",
+                "url": "https://example.test/aac-low",
+                "ext": "m4a",
+                "vcodec": "none",
+                "acodec": "mp4a.40.2",
+                "abr": 48,
+                "tbr": 48,
+                "filesize": 1,
+            },
+            {
+                "format_id": "opus-high",
+                "url": "https://example.test/opus-high",
+                "ext": "webm",
+                "vcodec": "none",
+                "acodec": "opus",
+                "abr": 160,
+                "tbr": 160,
+                "filesize": 1,
+            },
+        ]
+        with YoutubeDL(
+            {"quiet": True, "format_sort": ["abr", "acodec:aac"]}
+        ) as ydl:
+            info = {"formats": formats}
+            ydl.sort_formats(info)
+            selected = list(
+                ydl._select_formats(
+                    info["formats"],
+                    ydl.build_format_selector("ba/b"),
+                )
+            )
+
+        self.assertEqual(selected[0]["format_id"], "opus-high")
+
+
+if __name__ == "__main__":
+    unittest.main()

tests/test_service.py

@@ -89,11 +89,26 @@ class FakeDownloadManager:
         self.stopped = False
         self.delete_requests = []
         self.enqueue_calls = []
+        self.export_calls = []
+        self.export_reconciled = False
 
     def enqueue(self, url, submitter, note):
         self.enqueue_calls.append((url, submitter, note))
         return self.store.reserve_download(url, submitter, note)
 
+    def enqueue_export(self, url, mode, submitter, note):
+        self.export_calls.append((url, mode, submitter, note))
+        return self.store.reserve_export_job(
+            url,
+            mode,
+            submitter,
+            note,
+            max_active=20,
+        )
+
+    def reconcile_export_artifacts(self):
+        self.export_reconciled = True
+
     def recover_pending_deletions(self):
         self.recovered = True
 
@@ -171,6 +186,7 @@ class ControllerServiceTests(unittest.TestCase):
         )
         self.service.start()
         self.assertFalse(self.downloads.recovered)
+        self.assertTrue(self.downloads.export_reconciled)
         return self.service
 
     def ready_slot(self, slot=1):
@@ -497,6 +513,62 @@ class ControllerServiceTests(unittest.TestCase):
         self.assertIn("mqtt_disconnected", health["degraded_reasons"])
         self.assertIn("awaiting_player_evidence", health["degraded_reasons"])
 
+    def test_utility_export_is_slot_free_and_not_gated_by_player_evidence(self):
+        self.start_service()
+        self.assertIn(
+            "awaiting_player_evidence",
+            self.service.health()["degraded_reasons"],
+        )
+
+        result = self.service.enqueue_export(
+            "https://www.youtube.com/playlist?list=utility",
+            "mp4",
+            "Alice",
+            "ProPresenter",
+        )
+
+        self.assertEqual(result["kind"], "export")
+        self.assertEqual(result["status"], "queued")
+        self.assertEqual(result["mode"], "mp4")
+        self.assertIsNotNone(result["job_id"])
+        self.assertEqual(
+            self.downloads.export_calls,
+            [
+                (
+                    "https://www.youtube.com/playlist?list=utility",
+                    "mp4",
+                    "Alice",
+                    "ProPresenter",
+                )
+            ],
+        )
+        self.assertTrue(
+            all(slot.media_state == "empty" for slot in self.store.list_slots())
+        )
+        self.assertEqual(self.mqtt.json_messages, [])
+        self.assertEqual(self.mqtt.legacy_messages, [])
+        jobs = self.service.list_export_jobs(limit=10)
+        self.assertEqual(len(jobs), 1)
+        self.assertEqual(jobs[0]["job_id"], result["job_id"])
+        self.assertEqual(jobs[0]["output_paths"], [])
+
+    def test_invalid_utility_mode_is_rejected_without_player_side_effects(self):
+        self.start_service()
+
+        with self.assertRaisesRegex(ValueError, "unsupported utility export mode"):
+            self.service.enqueue_export(
+                "https://www.youtube.com/watch?v=one",
+                "slot1",
+                None,
+                None,
+            )
+
+        self.assertTrue(
+            all(slot.media_state == "empty" for slot in self.store.list_slots())
+        )
+        self.assertEqual(self.mqtt.json_messages, [])
+        self.assertEqual(self.mqtt.legacy_messages, [])
+
     def test_cleanup_waits_for_post_start_player_evidence_but_new_ingest_does_not(self):
         self.start_service()
         self.service._next_expiry = self.monotonic()

tests/test_store.py

@@ -150,6 +150,39 @@ class FreshStoreTests(StoreTestCase):
             )
             self.assertTrue(all(slot.media_state == "empty" for slot in store.list_slots()))
 
+    def test_export_listing_keeps_live_jobs_visible_before_recent_history(self):
+        with self.open_store() as store:
+            store.reserve_export_job(
+                "https://www.youtube.com/watch?v=active",
+                "mp4",
+                None,
+                None,
+                max_active=5,
+                job_id="active-old",
+            )
+            self.clock.value += 1
+            for index in range(3):
+                job_id = f"completed-{index}"
+                store.reserve_export_job(
+                    f"https://www.youtube.com/watch?v={index}",
+                    "mp3",
+                    None,
+                    None,
+                    max_active=5,
+                    job_id=job_id,
+                )
+                store.mark_export_running(job_id)
+                store.complete_export_job(
+                    job_id,
+                    (f"exports/audio/{job_id}/item.mp3",),
+                )
+                self.clock.value += 1
+
+            listed = store.list_export_jobs(limit=2)
+            self.assertEqual(listed[0].job_id, "active-old")
+            self.assertEqual(listed[0].status, "queued")
+            self.assertEqual(listed[1].job_id, "completed-2")
+
     def test_restart_marks_live_exports_interrupted_without_touching_slots(self):
         store = self.open_store()
         store.reserve_export_job(