[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
-------------------------------------+-------------------------------------
             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 babgvant):

 Replying to [comment:15 heleppkes]:
 > 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.

 I think initializing at 1.1 is the correct approach (it's what I do in my
 MSDK transcoder). Initializing at this level doesn't limit what the
 application can support.

 After init use m_pmfxSession->QueryVersion(&version) to retrieve the
 client's level and cascade the encoder config based on that:

 if(version.Major >= 1)
 {
       if(version.Minor >= 8)
       {
         // introduced in API 1.8
         m_CodingOptions2.BRefType = MFX_B_REF_UNKNOWN; //default is
 MFX_B_REF_UNKNOWN
         m_CodingOptions2.RepeatPPS = MFX_CODINGOPTION_ON;
         m_CodingOptions2.LookAheadDS = pInParams->nLADS;
 //MFX_LOOKAHEAD_DS_UNKNOWN default
       }

       if(version.Minor >= 7)
       {
         m_CodingOptions2.Trellis = pInParams->nTrellis;
         m_CodingOptions2.LookAheadDepth = pInParams->nLAD;
       }
 ...
 }

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Ticket URL: <https://trac.ffmpeg.org/ticket/4831#comment:20>
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