[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 babgvant):

 I made a mistake when I was testing earlier and didn't set the rate
 control to LA on the IVB system. Specifying -look_ahead 0 enables the
 ffmpeg qsv encoder, I didn't realize it was the default rate control until
 I looked at the code.

 I don't know how to test the hardware for feature support so I asked on
 the Intel MSDK forum. They are usually pretty good about responding;
 hopefully it is possible. In the meantime maybe LA shouldn't be the
 default rate control.

 While I was looking at it I made some of the version testing changes
 mentioned earlier (see attached patch).

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Ticket URL: <https://trac.ffmpeg.org/ticket/4831#comment:31>
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