[FFmpeg-trac] #7720(undetermined:new): ffprobe and AVI audio delay
FFmpeg
trac at avcodec.org
Sun Feb 10 00:13:20 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):
Finally I got a clean test file, thanks for the trimming idea.
Steps to reproduce:
1-Download sample TEST1.AVI file (just 8Mb size):
[https://drive.google.com/open?id=1qsnv7cbWyc3z5mao98dgUpO7venMJkRH]
2-Play it. Note that in t=00:00:28:345 audio pronounces the word: "TOKYO".
This is the correct time where it must appear.
3-Do a simple process with ffmpeg, for example with command:
{{{
ffmpeg -i TEST1.AVI -c:v libx264 -c:a mp3 TEST2.AVI
}}}
(An error appears at the end, caused by the trimming operation, I don't
think its critical).
4-Play "TEST2.AVI" and note that the word "TOKYO" appears at
t=00:00:25:800, i.e. 2.5 seconds before it should. Compressed video gets
unusable!
So there must be a hidden delay in the original AVI file that neither
'''ffmpeg''' can't see nor '''ffprobe''', as states this ticket.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/7720#comment:4>
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