[FFmpeg-trac] #3859(undetermined:new): mp4: start_time never zero

FFmpeg trac at avcodec.org
Mon Sep 15 02:17:27 CEST 2014

#3859: mp4: start_time never zero
             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

Comment (by 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.

Ticket URL: <https://trac.ffmpeg.org/ticket/3859#comment:6>
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