[FFmpeg-trac] #10537(avcodec:new): Unable to create QSV hwdevice context with onevpl and old drivers

[FFmpeg]

#10537: Unable to create QSV hwdevice context with onevpl and old drivers
-------------------------------------+-------------------------------------
             Reporter:  Steve        |                     Type:  defect
  Browne                             |
               Status:  new          |                 Priority:  normal
            Component:  avcodec      |                  Version:
             Keywords:               |  unspecified
  hwcontext_qsv qsv                  |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 After switching over to building with onevpl some systems with older Intel
 Windows drivers will fail to create hwdevice context. One system in
 particular has an Intel HD Graphics 4400 driver 20.19.15.4531 from
 9/29/2016. There was also another system that had drivers dated to 2018,
 but unfortunately that system is no longer available so I can't give more
 driver details than that.

 Upgrading the drivers will resolve it, but we have customers that are
 already working and we don't want them to have to upgrade drivers to get
 the software working again after an upgrade.

 Basically `MFXCreateSession` fails for some of these older drivers. I've
 modified the code to fallback to the else clause version of
 `*_create_mfx_session` which uses `MFXInitEx` instead and it resolves the
 issue.

 How to reproduce:
 {{{
 AVBufferRef* ctx= nullptr;
 AVDictionary* dict = nullptr;
 av_dict_set(&dict, "child_device_type", "d3d11va", 0);
 int result = ::av_hwdevice_ctx_create(&ctx, AV_HWDEVICE_TYPE_QSV, "auto",
 dict, 0);
 }}}

 I'll post the patch I have. It's just a quick and dirty fix of moving the
 else version of the functions out of the ifdefs and calling it from the
 else clause and in case of failure when creating from a loader. I don't
 bother cleaning up the loader and just let it get attached to the
 QSVSession as if it was successfully used.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10537>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker