#10929: ffmpeg does not take video fps into account when creating mkv file with
microdvd subtitles
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Reporter: Kicer | Type: defect
Status: new | Priority: normal
Component: undetermined | Version: 6.1
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Summary of the bug:
I've tried to create mkv file with subtitles embedded.
I ran ffmpeg with video and subtitles files as inputs and I got mkv video
file with invalid subtitles timestamps.
My video has 60fps and when I run it with a video player and I load
subtitles file manually then subtitles are ok. Problem appears after merge
into mkv.
How to reproduce:
{{{
% ffmpeg 60fmp_video.mp4 -i microdvd_subtitles.txt output.mkv
ffmpeg version n6.1.1 Copyright (c) 2000-2023 the FFmpeg developers
built with gcc 13.2.1 (GCC) 20230801
built on arch linux
}}}
What I have found is the bug: https://trac.ffmpeg.org/ticket/3287 which
seems to be exactly the same issue, however it should be fixed.
Additionaly I have tried to convert my subtitles file into srt file with
all options that came to my mind which could suggest to ffmpeg that input
file is for 60fps video, but output subtitles file always ends up with
incorrect timings (around ~2.5x larger time values, which suggests that
~24fps were used as a reference for microdvd file).
--
Ticket URL: <https://trac.ffmpeg.org/ticket/10929>
FFmpeg <https://ffmpeg.org>
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