Why does MiniDLNA stop indexing files?

Question

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I've read the useful question why is the minidlna database not refreshed and minidlna - not indexing files but this problem is different: It seems to stop scanning files at a certain file/after a certain directory.

Set up:

• Running on Raspberry PI
• Minidlna v1.2.1 from Raspbian Buster
• Large music collection (although it only gets up to a few hundred files), a mix of formats.
• fs.inotify.maxuserwatches=65536 in sysctl.conf
• User minidlna has read access to full media library
• /var/cache/minidlna where it keeps its database files, is on an ext4 partition.
• Logging is set to:

  log_level=debug,artwork=debug,database=debug,inotify=debug,scanner=debug,metadata=debug,http=warn,ssdp=debug,tivo=warn
  

• Watching top, the system does not seem to run out of memory while scanning.

• The only error in the log is:

  [2019/11/14 20:07:35] tagutils/tagutils-mp3.c:695: info: Bad header... dropping back for full frame search [/drive/files/Music/00 Various/some-song.mp3]

  But the scan appears to continue after this.

The problem lines seem to be here:

[2019/11/14 20:07:35] scanner.c:730: info: Scanning /drive/files/Music/00 Various/SomeFolder
[2019/11/14 20:07:37] monitor.c:178: debug: Add watch to /drive/files/Music

where it looks like it stops scanning and starts adding watches; there's no errors or warnings.

Stumped!

Answer 1

I had to run
sudo minidlnad -d -R to find I had a file with an invalid JPEG in it. Luckily, I could just delete the file. If that's not an option for you, there may be some way of editing the metadata for whatever file you have a problem with.