Subtitle fails to sync

[Zuchter]

I'm trying to sync a subtitle to a k-on episode that has internal subtitles, but it fails. I've tried the script before and it works with no issues on other k-on episodes. I use alass and Arch, dunno what might be causing the fail

[tatsumoto-ren]

This needs further investigation.

[Zuchter]

Any way I can help with debugging ?

[tatsumoto-ren]

Make sure you have ffmpeg and ffsubsync installed, and the add-on is configured. Then launch mpv from the terminal to see what it says in the logs.

[lionslancer]

Does the script fail to output at all, or does it output an unsynced file? The former could mean an unsupported subtitle type, the latter could mean that everything works as intended but something is preventing the files from synchronizing properly, such as one language having subbed OPs and EDs but not the other.

[Zuchter]

Make sure you have ffmpeg and ffsubsync installed, and the add-on is configured. Then launch mpv from the terminal to see what it says in the logs.

I've only installed alass trough the aur, should I also install ffsubsync?

I launched mpv with the video file trough the terminal and this is what I got :

[zuchter@cappy K-ON! Livehouse!]$ mpv '[ToishY] K-ON! Livehouse! - 01.mkv' (+) Video --vid=1 () (h264 1920x1080 23.976fps) (+) Audio --aid=1 --alang=jpn () 'FLAC' (flac 2ch 48000Hz) Audio --aid=2 --alang=jpn 'FLAC (commentary)' (flac 2ch 48000Hz) Audio --aid=3 --alang=jpn 'FLAC (commentary 2)' (flac 2ch 48000Hz) Subs --sid=1 --slang=eng (*) 'English' (ass) (+) Subs --sid=2 '[ToishY] K-ON! Livehouse! - 01.srt' (subrip) (external) File tags: Title: [ToishY] K-ON! Livehouse! AO: [pulse] 48000Hz stereo 2ch s32 VO: [gpu] 1920x1080 yuv420p (Paused) AV: 00:00:02 / 00:23:41 (0%) A-V: 0.000 [autosubsync] Extracting internal subtitles... (Paused) AV: 00:00:02 / 00:23:41 (0%) A-V: 0.000 [autosubsync] Starting alass... (Paused) AV: 00:00:02 / 00:23:41 (0%) A-V: 0.000 [autosubsync] Subtitle synchronization failed. (Paused) AV: 00:00:02 / 00:23:41 (0%) A-V: 0.000

Mpv does not output any subtitle file after the synchronization fails, and the k on episode has both the op and ed subbed in english.

edit: I just noticed that the same thing happens on attack on titan s1 but the op/ed is not subbed in english (but the episode is)

[tatsumoto-ren]

should I also install ffsubsync

Try it to see if it works.

[tatsumoto-ren]

I tried to reproduce your results but couldn't. alass works just fine with this add-on on my machine.

[lionslancer]

Do other files in the same release as the problematic files work properly? You mentioned other K-on episodes working, but are they from the same batch?

[Zuchter]

The K-on episode was from the same torrent

[Zuchter]

I installed ffsubsync trough the aur package and tried to sync the first episode of AOT and it worked just fine with ffsubsync!

I also tried it on another aot episode and the k-on livehouse one and it works just fine. I'll close this issue