--sub-source with --trim did not sync

[patpatqu]

When I included --sub-source option together with the --trim option, the subtitle of the outfile is out of sync. The arguments I used are:-

         --sub-source "sub_file.srt":disposition=default;metadata=language=eng --trim 154:0

Frame rate is 23.976 and I extracted the output files SRT and noticed that 9 milliseconds instead of 154 frames worth of time had been subtracted from the original time.

ORIGINAL:

 1
 00:00:01,697 --> 00:00:08,530


 2
 00:00:33,250 --> 00:00:34,556
 Wait!

 3
 00:00:34,643 --> 00:00:38,342
 Wait, just wait.

OUTPUT:

 1
 00:00:33,241 --> 00:00:34,547
 Wait!

 2
 00:00:34,634 --> 00:00:38,333
 Wait, just wait.

 3
 00:00:38,420 --> 00:00:41,249
 Hell is where you'll go
 if you do this, ma'am.

[rigaya]

--audio-source/--sub-source with --trim will not work properly. I'll add warning message for this in the future.

To apply --trim to the subtitle, you can first mux the subtitle track and then encode.

[rigaya]

I’ll close the issue as the topic has been answered.