[FFmpeg-trac] #5272(avcodec:open): videotoolbox fails to initialize for mpeg2, mpeg4 codec

[FFmpeg]

#5272: videotoolbox fails to initialize for mpeg2, mpeg4 codec
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             Reporter:  lucaswang    |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
  videotoolbox regression            |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by ponpon):

 if not reverted, those functions is waste its abilities in other codecs,
 mpeg2, mpeg4, h263.
 videotoolbox switchs between software and hardware decoding automatically
 if  kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder is
 used.
 i think a new implement of videotoolbox software decoding for  those
 functions  is a waste.
 do i misunderstand videotoolbox decoding?

 should i make a new ticket for those functions?

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Ticket URL: <https://trac.ffmpeg.org/ticket/5272#comment:8>
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