[FFmpeg-trac] #9599(avcodec:open): VideoToolbox VP9 hwaccel freezes ffmpeg

[FFmpeg]

#9599: VideoToolbox VP9 hwaccel freezes ffmpeg
-------------------------------------+-------------------------------------
             Reporter:  Eric Karnes  |                    Owner:  ePirat
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
  videotoolbox vp9                   |
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  1            |
-------------------------------------+-------------------------------------
Changes (by ePirat):

 * analyzed:  0 => 1
 * owner:  (none) => ePirat
 * status:  reopened => open
 * component:  undetermined => avcodec
 * reproduced:  0 => 1

Comment:

 Indeed this hang in Videotoolbox can be worked around with the
 `vp9_superframe` bsf, I am currently investigating ways to make this work
 for VT without breaking the rest…

 After some IRC discussion, given that VT expects packets not slices, one
 option would be to make VT its own codec, but downsides of this would be
 lack of software fallback and metadata propagation, which right now is
 parsed by the VP9 decoder IIUC.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9599#comment:27>
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