[FFmpeg-trac] #3859(undetermined:new): mp4: start_time never zero
FFmpeg
trac at avcodec.org
Mon Sep 15 01:33:45 CEST 2014
#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:1 cehoyos]:
> Are external libraries like libx264 and libfaac necessary to reproduce
this?
1. The problem does not surface if I omit the audio track by {{{ffmpeg -i
input -an test.mp4}}} with libx264
2. With {{{-c:a aac}}} ffmpeg suggests to use an external library like
libfaac - btw. the same problem happens with libfdk_aac - or {{{-strict
-2}}}; with the latter there's less de-sync, and it's negative; but I
don't want to use the native aac encoder anyway
I would argue this is a muxer issue. Basically the result is longer by
roughly one video frame. Therefore people well familiar with the original
material and a fine ear and eye will notice a slight de-sync.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/3859#comment:3>
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