[FFmpeg-trac] #4831(avcodec:new): 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     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  avcodec      |                  Version:  git-
             Keywords:  Intel Quick  |  master
  Sync, h264_qsv                     |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 How to reproduce:
 {{{
 % ffmpeg -i -c:v h264_qsv -i h264file.mp4 -c:v h264_qsv outputfile.mp4

 ffmpeg version
 git-master

 built on ...
 Anything after August 29th

 Platform
 Windows (built on Linux)
 }}}

 The version of ffmpeg built on August 29th works, after August 30ths does
 not, on my Ivy Bridge PC (i7-3770S). Post-Aug30 builds do work on my
 Haswell PC (i7-4770K). Most likely culprit is
 https://github.com/FFmpeg/FFmpeg/commit/67e87f8050cb8cc61e016cb77be137c18653cbfe
 probably a call that assumes a newer SDK version than is supported on IVB.

 Thanks

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