[FFmpeg-trac] #5593(avcodec:new): OS X h264_videotoolbox encoder and codecpar API race condition with extradata when using MP4 / mov

[FFmpeg]

#5593: OS X h264_videotoolbox encoder and codecpar API race condition with
extradata when using MP4 / mov
-------------------------------------+-------------------------------------
             Reporter:  vade         |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
  h264_videotoolbox, extradata,      |  Reproduced by developer:  0
  codecpar                           |
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by heleppkes):

 This would appear to be a bug in the videotoolbox encoder, and unrelated
 to the new encode API.
 Encoders need to set the extradata during init to work properly with
 formats that require global metadata. libx264 does this.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5593#comment:2>
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