[FFmpeg-trac] #3433(ffmpeg:new): using "shortest" results in mismatched audio and video lengths
FFmpeg
trac at avcodec.org
Mon Mar 3 20:23:14 CET 2014
#3433: using "shortest" results in mismatched audio and video lengths
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Reporter: mjmvisser | Type: defect
Status: new | Priority: normal
Component: ffmpeg | Version: git-master
Keywords: shortest | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Summary of the bug:
"-shortest" does not add trim/atrim filters, so the length of each output
stream will be a multiple of sample size. In the given example, the video
is exactly 1s, but the resulting output is 1.02s. If "-t 1.000" is passed
instead of "-shortest", the resulting output is exactly 1s.
The difference is that using "-t" adds trim/atrim filters, so the last
frame->nb_samples encoded will be truncated to fit the given duration.
How to reproduce:
{{{
% ffmpeg -y -probesize 500000 -f image2 -r 25 -i colorbars.%04d.png -i
100Hz_44100Hz_16bit_05sec.wav -shortest -c:v png -c:a pcm_s16le -q:v 1 -2
-f mov colorbars.mov
Note that input streams have durations of 5s and 1s.
% ffprobe colorbars.mov
Note that the output stream has a duration of 1.02s.
ffmpeg version N-60960-gf3eef02
built on Feb 28 2014 10:31:20
}}}
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Ticket URL: <https://trac.ffmpeg.org/ticket/3433>
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