Opened 7 weeks ago
#10929 new defect
ffmpeg does not take video fps into account when creating mkv file with microdvd subtitles
| Reported by: | Kicer | Owned by: | |
|---|---|---|---|
| Priority: | normal | Component: | undetermined |
| Version: | 6.1 | Keywords: | |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | no | |
| Analyzed by developer: | no |
Description
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).
