[FFmpeg-trac] #4769(ffmpeg:new): Concatenate: Audio and Video out of sync after a couple of rounds
FFmpeg
trac at avcodec.org
Tue Aug 11 20:08:43 CEST 2015
#4769: Concatenate: Audio and Video out of sync after a couple of rounds
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Reporter: Timster | Type: defect
Status: new | Priority: normal
Component: ffmpeg | Version: git-
Keywords: ffmpeg, | master
concatenate, desync, audio, video | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Hello!
Summary of the bug:
There is an issue with concatenating video files. After several rounds of
concatenation, the audio and video desync. The issue also occurs when just
concatenating one video file with itself several times so it can't be due
to video/audio settings being incompatible with each other. Different
containers/settings as well don't change anything.
This is the command I am using:
ffmpeg -f concat -i <(for i in `seq 5`; do printf "file %s\n"
/path/to/*.mkv; done) -c:v h264 -preset slow -b:v 1500k -minrate 1500k
-maxrate 1500k -bufsize 1500k -g 80 -c:a copy out1.mkv
It is a regression - I've have tested it with the static build
ffmpeg.static.64bit.2014-07-16 - it is working there. With my ppa build or
the git build it doesn't. The output is attached - produced with the ppa
build.
Best,
Tim
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Ticket URL: <https://trac.ffmpeg.org/ticket/4769>
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