No preview generated for .MOV files (video/quicktime) while .MP4 works fine

[xangel99]

Steps to reproduce

1. Run Nextcloud 29.x in Docker with PostgreSQL and Redis.
2. Enable previews and configure OC\Preview\Movie provider with ffmpeg/ffprobe installed (/usr/bin/ffmpeg, /usr/bin/ffprobe).
3. Upload .MOV video files (recorded on iPhone).
4. Run:

   occ files:scan --generate-metadata=1
   occ preview:generate

---

Expected behavior

• Previews should be generated for .MOV (video/quicktime) files, the same way as for .mp4 files.
• In the web and mobile clients, videos should appear in the Media tab with thumbnails (first frame of the video), not just in Files with a generic icon.

---

Actual behavior

• .MOV files are detected as video/quicktime, but preview generation fails with:

  No preview generator available for file of typev
  

• The Movie preview provider works fine for .mp4, but not for .mov.
• In the database, some .mov files were initially misclassified with mimetype v instead of video/quicktime.
• After correcting the DB entries and ensuring mimetypemapping.json includes .mov → video/quicktime, the issue persists.
• As a result, .mov files only show a generic video icon, not thumbnails.

---

System configuration

• Nextcloud version: 29.0.16 (nextcloud:29-apache Docker image)
• OS: Debian 13 host
• Database: PostgreSQL 16 (postgres:16-alpine)
• Redis: 7-alpine
• PHP: 8.2.29

Preview providers enabled:

OC\Preview\PNG
OC\Preview\JPEG
OC\Preview\GIF
OC\Preview\BMP
OC\Preview\XBitmap
OC\Preview\MP3
OC\Preview\TXT
OC\Preview\MarkDown
OC\Preview\Movie
OC\Preview\HEIC
OC\Preview\TIFF
OC\Preview\SVG

Config overrides:

preview_ffmpeg_path  => /usr/bin/ffmpeg
preview_ffprobe_path => /usr/bin/ffprobe

ffmpeg version:

ffmpeg version 5.1.7-0+deb12u1
built with gcc 12 (Debian 12.2.0-14+deb12u1)

Verification:
Running ffmpeg manually on .MOV works and produces valid thumbnails:

ffmpeg -y -ss 00:00:01 -i IMG_4421.MOV -frames:v 1 -vf "scale=640:-1" /tmp/test_mov_thumb.jpg
# → Correct image extracted.

Database observations:

• Before fixes:

  full_mime = v
  mime_part = NULL
  

• After cleanup:

  full_mime = video/quicktime
  mime_part = video
  

Yet previews are still not generated → error remains:

No preview generator available for file of typev

---

Conclusion

There seems to be a bug in the OC\Preview\Movie provider:

• It does not recognize .MOV (video/quicktime) even when ffmpeg and mimetype mappings are properly configured.
• .mp4 works fine under the exact same setup.
• This prevents Nextcloud from generating thumbnails/previews for iPhone videos, affecting usability in the Media view.

---

Steps already attempted

• Added .mov → video/quicktime mapping in mimetypemapping.json.
• Ran occ maintenance:mimetype:update-db and update-js.
• Fixed DB entries (oc_filecache, oc_mimetypes) to ensure video/quicktime.
• Cleared previews cache and rescanned files.
• Verified ffmpeg/ffprobe binaries and manual thumbnail generation.
• Restarted containers (app + cron).

➡️ Despite all this, Nextcloud still refuses to generate previews for .MOV.

---

Request

Please add/fix support for .MOV (video/quicktime) in OC\Preview\Movie, so that:

• Previews are generated (using ffmpeg, like .mp4).
• Videos appear in the Media tab with thumbnails, not only in Files with a generic icon.

[xangel99]

Update: MOV Previews Working

Update

After further testing, previews for .MOV files are now working.
The fix required several manual steps:

• Ensured .mov → video/quicktime mapping in config/mimetypemapping.json.
• Ran occ maintenance:mimetype:update-db and occ maintenance:mimetype:update-js.
• Fixed database entries in oc_filecache and oc_mimetypes (some .mov files were stored with mimetype = v).
• Deleted old previews in appdata_<instanceid>/preview/<fileid>.
• Ran occ files:scan --generate-metadata=1.
• Restarted containers (nextcloud-app + nextcloud-cron).
• Set paths explicitly:

  occ config:system:set preview_ffmpeg_path --value="/usr/bin/ffmpeg"
  occ config:system:set preview_ffprobe_path --value="/usr/bin/ffprobe"

• Verified OC\Preview\Movie is in enabledPreviewProviders.

Result

• .MOV previews are now generated correctly, with thumbnails visible in the web and mobile apps.
• The issue seems to be related to wrong mimetype entries (v instead of video/quicktime) and cache inconsistencies.

Suggestion

It may still be worth investigating why some .MOV uploads are misclassified (mimetype = v).
If that mapping issue is fixed upstream, manual DB fixes and cache resets wouldn’t be necessary.