Not work well with parts with no sound between scenes

Ruke805 commented 3 years ago

Something I noticed is that in certain videos it doesn't work well when in one scene to another, with the screen totally black and no sound it can't sync normally, it usually fixes one part of the video, but not others. Looking through the audio spectrum, I noticed that it's always in this type of scene:

Well, That something can be investigated in the future

chrysn commented 2 years ago

Does this issue occur even when --no-split is given? Or do you need split mode?

kaegi commented 2 years ago

I don't see a reason why it wouldn't work in this case (with split or no-split; though no-split is much, much more reliable if there really is no split)... Maybe try to use

alass video.mkv _ out.srt

If you then start out.srt with the video you can see what the algorithm tries to synchronize to. There should be no lines in the 'silent' area.

Ruke805 commented 2 years ago

I don't see a reason why it wouldn't work in this case (with split or no-split; though no-split is much, much more reliable if there really is no split)... Maybe try to use
alass video.mkv _ out.srt
If you then start out.srt with the video you can see what the algorithm tries to synchronize to. There should be no lines in the 'silent' area.

Yes, should be done this way, but for some reason when it tries to align in this kind of part, it just "skip", and all the rest of the subtitle be unsynchronized. Sometimes the beginning is synchronized, but in another case all of it keeps unsynchronized.

For example, this subtitle can not be synchronized, I've tried a lot of times, and does not work. Even with --no-split to another flag. You can find this file on rarbg, or if you prefer, I can share it with you, just give me an email.

Fosse.Verdon.S01E04.1080p.AMZN.WEB-DL.DDP5.1.H.264-MZABI.srt.zip

kaegi / alass

Not work well with parts with no sound between scenes #34