[FFmpeg-trac] #6996(ffmpeg:new): attempting to use QSV on supported Intel system with NVidia primary GPU on Windows 10 causes crash

[FFmpeg]

#6996: attempting to use QSV on supported Intel system with NVidia primary GPU on
Windows 10 causes crash
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             Reporter:  Statick    |                     Type:  defect
               Status:  new        |                 Priority:  normal
            Component:  ffmpeg     |                  Version:  git-master
             Keywords:  qsv crash  |               Blocked By:
             Blocking:             |  Reproduced by developer:  0
Analyzed by developer:  0          |
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 Summary of the bug:
 Hardware is Intel Pentium G4600 with Intel HD Graphics 630, and Nvidia
 Geforce GT 1030 with single display attached to the Nvidia HDMI. No
 display is attached to the Intel HD Graphics HDMI.

 Both sets of graphics drivers are installed and working, and QuickSync is
 working for encodes and decodes in many other softwares (HandBrake
 QuickSync encoding works, StaxRip QuickSync encoding works, LAV Filter
 QuickSync decoding works) under this configuration with the Nvidia as
 primary GPU

 Attempting "ffmpeg -init_hw_device qsv" with this configuration gives
 error in command window output, followed by windows crash report. Removing
 Nvidia GPU and running with Intel HD Graphics as primary GPU does not
 cause the same error.

 Error is "[AVHWDeviceContext @ 0000018fa63c9bc0] Error setting child
 device handle: -6"

 How to reproduce:
 Configure system as described and try "ffmpeg -init_hw_device qsv"

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Ticket URL: <https://trac.ffmpeg.org/ticket/6996>
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