[FFmpeg-trac] #4831(avcodec:reopened): Can't initialize h264_qsv encoder post Aug 29 2015 - Ivy Bridge CPU

[FFmpeg]

#4831: Can't initialize h264_qsv encoder post Aug 29 2015 - Ivy Bridge CPU
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             Reporter:  babgvant     |                    Owner:  IvUs
                 Type:  defect       |                   Status:  reopened
             Priority:  important    |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  qsv          |               Blocked By:
  regression                         |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  1            |
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Comment (by heleppkes):

 The version passed to mfxInit is just the minimal version, not the version
 the actual runtime will end up being in the end.

 So what happens when we request runtime 1.1 on a modern GPU?
 From what I can tell, nothing changes at all, since the actual runtime
 version is still the same.

 What changes on an old GPU? Well, I can't be 100% sure about that. Maybe
 it still fails because unsupported options are set, but from what I can
 tell only the LookAhead RC mode is "new" enough, and HEVC support. So
 would it work, and only fail if LA or HEVC is used?

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Ticket URL: <https://trac.ffmpeg.org/ticket/4831#comment:15>
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