#11268: -use_wallclock_as_timestamps 1 not working with piped input
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Reporter: Wes Castro | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Summary of the bug:
When piping a raw H264 stream to FFmpeg with `-use_wallclock_as_timestamps
1`, wallclock times are not used. If the pipe is opened for say 10
seconds, it's expected that the output's duration will be ~10 seconds.
Instead it seems to use timing info from the input stream. I didn't test
with other types of piped inputs
The issue was introduced in FFmpeg 6.1 and repros on the master branch.
How to reproduce:
{{{
ffmpeg -y -f lavfi -i testsrc=duration=1:size=1280x720:rate=30 -f h264
~/1second.h264
(cat ~/1second.h264; sleep 10; cat ~/1second.h264) | ffmpeg
-use_wallclock_as_timestamps 1 -i pipe: -f mp4 ~/test.mp4 -y
}}}
Here are the durations reported by FFprobe when using various FFmpeg
versions for the second line:
* FFmpeg 6.0: 11.5s
* FFmpeg 6.1: 2.0s
* FFmpeg 7.1: 2.0s
* master branch (08b1bffa49715a9615acc025dfbea252d8409e1f): 2.0s
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11268>
FFmpeg <https://ffmpeg.org>
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