#3859: mp4: start_time never zero
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Reporter: blacktrash | Owner:
Type: defect | Status: new
Priority: normal | Component:
Version: git-master | undetermined
Keywords: | Resolution:
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
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Comment (by blacktrash):
Replying to [comment:6 blacktrash]:
> Replying to [comment:5 blacktrash]:
> > With {{{-c:a libfdk_aac -profile:a aac_he -b:a 64k}}} start_time is
reliably {{{-0.114694}}}, even for audio only.
> > So I'm gonna ask there, with the fear to be referred back to here.
>
> Upon further reflection: encoding to raw aac obviously does not know
about start time, and muxing audio only e.g. into an m4a container gives
the abovementioned negative start time.
> So again, it points to some muxing problem - which is done by ffmpeg.
And it may cause indeed problems also with the ffmpeg segmenter with fixed
keyframe positions, as the first keyframe will be outside the
segment_time_delta which is usually lower than 0.114694 if it's set at the
recommended value. I notice that the first segment is always longer than
segment_time.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/3859#comment:8>
FFmpeg <https://ffmpeg.org>
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