/batch endpoint returns 200 but never processes files, even with DEBUG=True

[bryangrandy]

Setup:

• Running mccloud/subgen:latest on Synology DSM via Container Manager (not Docker Desktop)
• Volume mount: /volume1/Videos → /media (rw)
• Environment: PUID=99, PGID=100, DEBUG=True
• Folder permissions confirmed correct (drwxr-xr-x)
• Confirmed via container terminal that the app can see the files (ls -la /media/[folder] shows all video files correctly)
• Confirmed via ffprobe that a sample .mp4 has a valid video + audio stream, no embedded subtitle track, audio tagged as (eng) in metadata (this may or may not be accurate — audio is not actually English)

What I did:
POST to /batch?directory=%2Fmedia%2F[FolderName]

What happens:

• Response: 200, body: null
• Logs show only:
  • DEBUG: /media/[FolderName]
  • DEBUG: The folders are:
  • INFO: Starting to search folders to see if we need to create subtitles.
• No further log lines ever appear, even with DEBUG=True
• CPU usage stays near 0%, confirming no transcription is actually happening
• No .srt files are created
• Confirmed the folder contains video files with no existing .srt subtitle files (verified manually) and no .subgen_skip marker file present

What I expected:
Per-file processing to begin, or at minimum, DEBUG-level log lines explaining why each file is being skipped.

Question:
Is there a specific default setting (e.g., related to audio language detection or PREFERRED_AUDIO_LANGUAGES) that could cause transcribe_existing() to silently exit without processing or logging anything for a folder, even when DEBUG is enabled? Any guidance on what additional environment variables to check would be appreciated.

[McCloudS]

Depending on how you're configured: INFO: Starting to search folders to see if we need to create subtitles. Could be stuck in that for a while looking through the whole directory recursively.

Without your config and actual pasted log it's hard to guess. You could always be running into a resource issue. Synology machines are usually running the low powered intel chips with < 8gb of ram.