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Old 10th July 2020, 23:44   #1  |  Link
carlosrodriguez
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Join Date: Jun 2020
Posts: 6
ffmpeg creates subtitles delay

Hi everyone

I want to mux a .ass subtitles file into a matroska container together with a video stream.

First I checked the .ass file in Aegisubs before muxing and I got the following timing on the individual subtitles lines:
First text line from 00:14.49 - 00:17.83




If I now mux the .ass file together with a .mkv video file with mkvtoolnix I get the following timing on the first line (through checkingt he resulting .mkv with embedded .ass in Aegisub):
First text line from 00:14.49 - 00:17.83

mkvtoolnix muxed the subtitles file exactly as it was when I checked the .ass file in Aegisub before muxing.



When I tried to mux the .ass file together with a video.mkv file using ffmpeg and the following command, the subtitles timing gets messed up and delayed (through checking the resulting .mkv with embedded .ass in Aegisub):
ffmpeg -i video.mkv -i subtitles.ass -map 0 -map 1 -c copy -output.mkv
First text line from 00:14.44 - 00:17-78




In conclusion: When I mux with ffmpeg instead of mkkvtoolnix, I get delayed subtitles of - 0.05s.

Has anybody else encountered this problem when muxing subtitles with ffmpeg. How can I avoid this and make ffmpeg mux the .ass file exactly as it is shown when opened in Aegisub without creating that 0.05s delay?

Last edited by carlosrodriguez; 11th July 2020 at 14:58.
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