[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 IvUs):

 Replying to [comment:15 heleppkes]:
 > So what happens when we request runtime 1.1 on a modern GPU?
 Currently we will do not have HEVC codec an LA modes.
 >
 > 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?
 I still not tested yet (my own hardware is haswell). But looks like ivy
 bridge should to work even with build compiled under MINOR=9 if
 look_ahead=0 specified in command line. If yes than it will bad idea to
 make look_ahead=1 by default and all that is necessary is only correct
 default ratecontrol.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4831#comment:16>
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