feat(dashcam): mobile layout fix + optional hw-encode conversion on import

- yaris.css: on mobile (<576px) hide file/size/date/upload cols, show
  filename inside thumb cell, icon-only buttons, dash-actions-td nowrap
- local-videos.js: filename in thumb cell for mobile; Converting badge with
  spinner; auto-refresh every 10s while any file is converting
- app_video.py: CONVERT_SETTING, is_convert_enabled(), queue_convert(),
  _convert_bg() — h264_v4l2m2m + aac faststart, deletes original on success
- app_dash.py: call queue_convert() after each successful copy on import
- app_settings.py: expose video_convert_enabled in get/save settings
- settings.html: toggle for 'Convert imported videos for web playback'

Co-authored-by: Copilot <[email protected]>

modules/app_video.py

@@ -12,10 +12,76 @@ from modules import app_dash, app_sql
 BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 THUMBNAIL_DIR = os.path.join(BASE_DIR, "dash", "thumbnails")
 RETENTION_SETTING = "local_video_retention_days"
+CONVERT_SETTING = "video_convert_enabled"
 _thumbnail_lock = Semaphore()
-# Tracks which relative paths are currently being generated (set of strings)
 _generating = set()
 _generating_lock = Semaphore()
+_converting = set()
+_converting_lock = Semaphore()
+
+
+def is_convert_enabled():
+    return app_sql.get_setting(CONVERT_SETTING, "0") == "1"
+
+
+def queue_convert(relative_path):
+    """Spawn a background greenlet to re-encode relative_path to web-ready MP4.
+    No-op if conversion is disabled, already running, or file is already MP4."""
+    if not is_convert_enabled():
+        return
+    if relative_path.lower().endswith(".mp4"):
+        return
+    with _converting_lock:
+        if relative_path in _converting:
+            return
+        _converting.add(relative_path)
+    gevent.spawn(_convert_bg, relative_path)
+
+
+def _convert_bg(relative_path):
+    try:
+        source_path = _local_path(relative_path)
+        mp4_relative = os.path.splitext(relative_path)[0] + ".mp4"
+        mp4_path = _local_path(mp4_relative)
+
+        if not app_dash.begin_local_video_use(relative_path):
+            return
+
+        try:
+            tmp_path = mp4_path + ".converting.mp4"
+            cmd = [
+                "ffmpeg", "-nostdin", "-loglevel", "error", "-y",
+                "-i", source_path,
+                "-c:v", "h264_v4l2m2m",
+                "-c:a", "aac",
+                "-movflags", "faststart",
+                "-f", "mp4",
+                tmp_path,
+            ]
+            proc = subprocess.Popen(cmd, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+            while proc.poll() is None:
+                sleep(1)
+            if proc.returncode == 0 and os.path.isfile(tmp_path) and os.path.getsize(tmp_path) > 0:
+                os.replace(tmp_path, mp4_path)
+                # Delete original now that MP4 is ready
+                try:
+                    os.remove(source_path)
+                except OSError:
+                    pass
+                # Also remove old thumbnail so it gets regenerated from MP4
+                _source, thumb = _thumbnail_path(relative_path)
+                if os.path.isfile(thumb):
+                    try:
+                        os.remove(thumb)
+                    except OSError:
+                        pass
+            elif os.path.exists(tmp_path):
+                os.remove(tmp_path)
+        finally:
+            app_dash.end_local_video_use(relative_path)
+    finally:
+        with _converting_lock:
+            _converting.discard(relative_path)
 
 
 def _local_path(relative_path):
@@ -47,6 +113,8 @@ def list_local_videos():
         except OSError as e:
             errors.append(f"{relative_path}: {e}")
             continue
+        with _converting_lock:
+            converting = relative_path in _converting
         files.append(
             {
                 "path": relative_path,
@@ -57,6 +125,7 @@ def list_local_videos():
                     stat.st_size,
                     stat.st_mtime,
                 ) in uploaded_stats,
+                "converting": converting,
             }
         )
         total_size += stat.st_size