[FFmpeg-trac] #9599(undetermined:reopened): VideoToolbox VP9 hwaccel freezes ffmpeg

[FFmpeg]

#9599: VideoToolbox VP9 hwaccel freezes ffmpeg
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             Reporter:  Eric Karnes  |                    Owner:  (none)
                 Type:  defect       |                   Status:  reopened
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
  videotoolbox vp9                   |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by FreezyLemon):

 Nice. Good to know that this can be worked around. I assume that forcing
 decoding via `vp9_videotoolbox` without hwaccel would result in a crash,
 or corrupted output? That would make this workaround risky to use... Maybe
 there's a way to define a codec as "HW accelerated only", meaning it
 doesn't provide software decoding at all?
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Ticket URL: <https://trac.ffmpeg.org/ticket/9599#comment:24>
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