[FFmpeg-trac] #4659(undetermined:new): Support the MFX Dispatcher from Intel Media SDK

[FFmpeg]

#4659: Support the MFX Dispatcher from Intel Media SDK
-------------------------------------+-------------------------------------
             Reporter:  TheTroll     |                     Type:
               Status:  new          |  enhancement
            Component:               |                 Priority:  normal
  undetermined                       |                  Version:
             Keywords:  qsv          |  unspecified
  quicksync intel                    |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 The current implementation of QSV supposes that the MFX dispatcher will
 open the VA session.

 This is true with the MFX dispatcher available on github, but this version
 does not work properly, specially when closing the session.

 With the official MFX dispatcher from the Intel Media SDK package, FFMPEG
 needs to open itself HW accelerated VA session.

 This can be done like this:
 https://github.com/TheTroll/FFmpeg/commit/69bff7abfcd321a29c23606cec973b75314f3b94
 +
 https://github.com/TheTroll/FFmpeg/commit/725f96bf2c71406ec535b8fed5d5879ec32a9881

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Ticket URL: <https://trac.ffmpeg.org/ticket/4659>
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