I want to convert MKV audio from DTS to MP3 and split the file at the same time. The problem is: I need an external .srt but when I split it, the second file is desynced from video.
Example:
ffmpeg -ss 01:00:00 -i videoIN.mkv -ss 01:00:00 -i videoIN.srt -map 0 \
-vcodec copy -acodec libmp3lame videoOUT.mkv -map 1 -c copy videoOUT.srt
The result is perfectly playable but the subs are slightly desynced, probably because the video is cut at the nearest keyframe but subs are cut exactly.
Using accurate seek (-ss before output file) produce a synced sub but the video is unplayable by my stand-alone media player, probably because it starts without a keyframe.
How can i cut the .srt at the nearest keyframe with ffmpeg?
ffmpeg version 2.5.3-tessus Copyright (c) 2000-2015 the FFmpeg developers
built on Jan 10 2015 01:19:50 with Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
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libavutil 54. 15.100 / 54. 15.100
libavcodec 56. 13.100 / 56. 13.100
libavformat 56. 15.102 / 56. 15.102
libavdevice 56. 3.100 / 56. 3.100
libavfilter 5. 2.103 / 5. 2.103
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 3.100 / 53. 3.100
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...
Use -h to get full help or, even better, run 'man ffmpeg'
