[FFmpeg-trac] #7030(avcodec:open): qsv in ffmpeg

[FFmpeg]

#7030: qsv in ffmpeg
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             Reporter:  palich2000   |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  qsv          |               Blocked By:
  regression                         |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Changes (by fulinjie):

 * cc: linjie.fu@… (added)


Comment:

 Double confirmed that it works on windows and this issue occurs on linux
 only in ffmpeg qsv decode, and could be reproducde with any
 clips(H264/H265).

 And this issue could be split into two parts:
 1. which part introduces this regression?
 2. why it works on windows but fails on linux?

 Analysis:
 1.
 This error may be relevant with FactoryCORE::CreateCORE and
 VAAPIVideoCORE::SetHandle.
 On Linux, the created CORE is used in
 MFXVideoDECODE_Init/MFX_Utility::CheckVideoParam without calling
 SetHandle.

 However, Application shall call SetHandle on Linux, but it wasn't called
 in Linux pipeline currently after FactoryCORE::CreateCORE was called.(in
 MFXInit() inside ff_qsv_process_data)


 2.And the reason it works for windows may be:
 "On the past we intentionally didn't implement initialization of vaDisplay
 inside MSDK library on Linux because on Linux there were many back-
 ends(X11, Wayland, headless drm, etc) and that time we didn't want to
 bring this logic inside MediaSDK."

 https://github.com/Intel-Media-SDK/MediaSDK/issues/1611

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Ticket URL: <https://trac.ffmpeg.org/ticket/7030#comment:22>
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