[FFmpeg-trac] #7720(undetermined:new): ffprobe and AVI audio delay
FFmpeg
trac at avcodec.org
Sat Feb 9 14:46:44 EET 2019
#7720: ffprobe and AVI audio delay
-------------------------------------+-------------------------------------
Reporter: DCTing | Owner:
Type: defect | Status: new
Priority: normal | Component:
| undetermined
Version: unspecified | Resolution:
Keywords: AVI | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Comment (by DCTing):
Unfortunately the original AVI file is 1.98Gb length, unless you point a
way for me to upload it.
I've tried to trim it and get a shorter test file to upload, but the
operation doesn't inherit the strange delay property.
For example if I trim it with...
{{{
ffmpeg -i InputFile.avi -t 30 -c:v copy -c:a copy OutputFile.avi
}}}
...I get an invalid video, with the delay "burned" and '''clearly
audible''', in spite of the copy order, that should keep it intact. In the
input file delay '''is not''' audible.
Somehow the metadata that informs about the delay is cleared in the
trimming process (and in '''any''' process, I dare to say). Depending on
the tool used to trim, sometimes the delay gets burned in (ffmpeg,
Avidemux), and sometimes not (because corrected by the tool, as
Handbrake).
But always the final result looses the metadata about the delay info, that
is the one we want to measure with ffprobe.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/7720#comment:2>
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