[FFmpeg-trac] #5120(undetermined:new): Incorrect start frame when converting mpeg2video in .mov to mp4
FFmpeg
trac at avcodec.org
Sun Jan 3 23:38:53 CET 2016
#5120: Incorrect start frame when converting mpeg2video in .mov to mp4
-------------------------------------+-------------------------------------
Reporter: sroy8 | Owner:
Type: defect | Status: new
Priority: normal | Component:
Version: unspecified | undetermined
Keywords: mov | Resolution:
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
-------------------------------------+-------------------------------------
Comment (by sroy8):
Yes, iMovie shows the time of the input file as 0.7s, and the time of the
output file as 1.2s. This corresponds to what I see in Quicktime, though
Quicktime doesn't display times at sub-second precision, so I can't
confirm there. I can confirm that in iMovie the two files look very
different.
The output I'm expecting is roughly the equivalent of:
{{{
% ffmpeg -ss 0.522533 -i incorrect-start-frame.mov correct-start-frame.mp4
}}}
This uses -ss with the start time value of the input video. Running
ffprobe on correct-start-frame.mp4 gives:
{{{
% ffprobe correct-s
Duration: 00:00:00.70, start: 0.021333, bitrate: 11945 kb/s
}}}
Inspecting this by eye, the result still isn't quite right, since the
initial frame looks slightly different. You can see that the feet are cut
off at the bottom of the picture in a slightly different position than in
the input video.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/5120#comment:7>
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