Hello all!
I was trying to debug my _qsv profiles for Cinelerra-GG (of course) and was
hitting wall due to my machine being AMD CPU/Nvidia (nouveau) GPU.

Then I foundhttps://github.com/oneapi-src/oneVPL-cpu/blob/master/INSTALL.md

Deprecated by intel but still buildable after some fighting.

bash-5.1$ vpl-inspect

Implementation #0: oneAPI VPL CPU Implementation
   Library path: /usr/local/lib/libvplswref32.so.1
   AccelerationMode: MFX_ACCEL_MODE_NA
   ApiVersion: 2.13
   Impl: MFX_IMPL_TYPE_SOFTWARE
   VendorImplID: 0x0000
   ImplName: oneAPI VPL CPU Implementation
   License: MIT
   Version: 1.2
   Keywords: VPL,CPU,x64
   VendorID: 0x8086
   mfxAccelerationModeDescription:
     Version: 1.0
     Mode: MFX_ACCEL_MODE_NA
   mfxPoolPolicyDescription:
     Version: 1.0
     Policy: MFX_ALLOCATION_UNLIMITED
   mfxDeviceDescription:
     MediaAdapterType: MFX_MEDIA_UNKNOWN
     DeviceID: 0000
     Version: 1.1
   mfxDecoderDescription:
     Version: 1.0
     CodecID: AV1
     MaxcodecLevel: 53
       Profile: MFX_PROFILE_AV1_MAIN
         MemHandleType: MFX_RESOURCE_SYSTEM_SURFACE
           Width Min: 64
           Width Max: 4096
           Width Step: 8
           Height Min: 64
           Height Max: 4096
           Height Step: 8
           ColorFormats: IYUV, I010
     CodecID: AVC
     MaxcodecLevel: 52
       Profile: MFX_PROFILE_AVC_HIGH
         MemHandleType: MFX_RESOURCE_SYSTEM_SURFACE
           Width Min: 64
           Width Max: 4096
           Width Step: 8
           Height Min: 64
           Height Max: 4096
           Height Step: 8
           ColorFormats: IYUV
     CodecID: HEVC
     MaxcodecLevel: 51
       Profile: MFX_PROFILE_HEVC_MAIN
         MemHandleType: MFX_RESOURCE_SYSTEM_SURFACE
           Width Min: 64
           Width Max: 4096
           Width Step: 8
           Height Min: 64
           Height Max: 4096
           Height Step: 8
           ColorFormats: IYUV
       Profile: MFX_PROFILE_HEVC_MAIN10
         MemHandleType: MFX_RESOURCE_SYSTEM_SURFACE
           Width Min: 64
           Width Max: 4096
           Width Step: 8
           Height Min: 64
           Height Max: 4096
           Height Step: 8
           ColorFormats: I010
     CodecID: JPEG
     MaxcodecLevel: 0
       Profile: MFX_PROFILE_JPEG_BASELINE
         MemHandleType: MFX_RESOURCE_SYSTEM_SURFACE
           Width Min: 64
           Width Max: 4096
           Width Step: 8
           Height Min: 64
           Height Max: 4096
           Height Step: 8
           ColorFormats: IYUV
     CodecID: MPG2
     MaxcodecLevel: 8
       Profile: MFX_PROFILE_MPEG2_MAIN
         MemHandleType: MFX_RESOURCE_SYSTEM_SURFACE
           Width Min: 64
           Width Max: 4096
           Width Step: 8
           Height Min: 64
           Height Max: 4096
           Height Step: 8
           ColorFormats: IYUV
   mfxEncoderDescription:
     Version: 1.0
     CodecID: AV1
     MaxcodecLevel: 53
     BiDirectionalPrediction: 1
     ReportedStats: 0
       Profile: MFX_PROFILE_AV1_MAIN
         MemHandleType: MFX_RESOURCE_SYSTEM_SURFACE
           Width Min: 64
           Width Max: 4096
           Width Step: 8
           Height Min: 64
           Height Max: 4096
           Height Step: 8
           ColorFormats: IYUV, I010
     CodecID: HEVC
     MaxcodecLevel: 51
     BiDirectionalPrediction: 1
     ReportedStats: 0
       Profile: MFX_PROFILE_HEVC_MAIN
         MemHandleType: MFX_RESOURCE_SYSTEM_SURFACE
           Width Min: 64
           Width Max: 4096
           Width Step: 8
           Height Min: 64
           Height Max: 4096
           Height Step: 8
           ColorFormats: IYUV
       Profile: MFX_PROFILE_HEVC_MAIN10
         MemHandleType: MFX_RESOURCE_SYSTEM_SURFACE
           Width Min: 64
           Width Max: 4096
           Width Step: 8
           Height Min: 64
           Height Max: 4096
           Height Step: 8
           ColorFormats: I010
     CodecID: JPEG
     MaxcodecLevel: 0
     BiDirectionalPrediction: 0
     ReportedStats: 0
       Profile: MFX_PROFILE_JPEG_BASELINE
         MemHandleType: MFX_RESOURCE_SYSTEM_SURFACE
           Width Min: 64
           Width Max: 4096
           Width Step: 8
           Height Min: 64
           Height Max: 4096
           Height Step: 8
           ColorFormats: IYUV
   mfxVPPDescription:
     Version: 1.0
     FilterFourCC: VCSC
     MaxDelayInFrames: 1
       MemHandleType: MFX_RESOURCE_SYSTEM_SURFACE
       Width Min: 64
       Width Max: 4096
       Width Step: 8
       Height Min: 64
       Height Max: 4096
       Height Step: 8
         InFormat: I010
           OutFormats: IYUV, RGB4
         InFormat: IYUV
           OutFormats: I010, RGB4
         InFormat: RGB4
           OutFormats: IYUV, I010
     FilterFourCC: VSCL
     MaxDelayInFrames: 1
       MemHandleType: MFX_RESOURCE_SYSTEM_SURFACE
       Width Min: 64
       Width Max: 4096
       Width Step: 8
       Height Min: 64
       Height Max: 4096
       Height Step: 8
         InFormat: I010
           OutFormats: I010
         InFormat: IYUV
           OutFormats: IYUV
         InFormat: RGB4
           OutFormats: RGB4
   NumExtParam: 0

Total number of implementations found = 1

But ffmpeg still does not work:

bash-5.1$ ./ffmpeg/ffmpeg -i mc.avi -c:v mjpeg_qsv -f null /dev/null
ffmpeg version N-116241-g9bc1678934 Copyright (c) 2000-2024 the FFmpeg
developers
   built with gcc 11.2.0 (GCC)
   configuration: --enable-libvpl
   libavutil      59. 41.100 / 59. 41.100
   libavcodec     61. 21.100 / 61. 21.100
   libavformat    61.  9.100 / 61.  9.100
   libavdevice    61.  4.100 / 61.  4.100
   libavfilter    10.  6.100 / 10.  6.100
   libswscale      8.  4.100 /  8.  4.100
   libswresample   5.  4.100 /  5.  4.100
[aist#0:1/pcm_u8 @ 0xb39c2c0] Guessed Channel Layout: mono
Input #0, avi, from 'mc.avi':
   Metadata:
     software        : MEncoder SVN-r38660-11.2.0
   Duration: 00:00:28.29, start: 0.000000, bitrate: 3259 kb/s
   Stream #0:0: Video: mjpeg (Baseline) (mjpg / 0x67706A6D), yuvj422p(pc,
bt470bg/unknown/unknown), 320x240, 3205 kn
   Stream #0:1: Audio: pcm_u8 ([1][0][0][0] / 0x0001), 7812 Hz, mono, u8, 62
kb/s
Stream mapping:
   Stream #0:0 -> #0:0 (mjpeg (native) -> mjpeg (mjpeg_qsv))
   Stream #0:1 -> #0:1 (pcm_u8 (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
[swscaler @ 0xf4c0e2c0] deprecated pixel format used, make sure you did set
range correctly
[mjpeg_qsv @ 0xb3a7040] Error creating a MFX session: -9.
[vost#0:0/mjpeg_qsv @ 0xb3a6b40] [enc:mjpeg_qsv @ 0xb3a6f80] Error while
opening encoder - maybe incorrect paramet.
[vf#0:0 @ 0xb3a7d40] Error sending frames to consumers: Unknown error
occurred
[vf#0:0 @ 0xb3a7d40] Task finished with error code: -1313558101 (Unknown
error occurred)
[vost#0:0/mjpeg_qsv @ 0xb3a6b40] [enc:mjpeg_qsv @ 0xb3a6f80] Could not open
encoder before EOF
[vost#0:0/mjpeg_qsv @ 0xb3a6b40] Task finished with error code: -22
(Invalid argument)
[vost#0:0/mjpeg_qsv @ 0xb3a6b40] Terminating thread with return code -22
(Invalid argument)
[vf#0:0 @ 0xb3a7d40] Terminating thread with return code -1313558101
(Unknown error occurred)
[out#0/null @ 0xb39cb40] Nothing was written into output file, because at
least one of its streams received no pac.
frame=    0 fps=0.0 q=0.0 Lsize=       0KiB time=N/A bitrate=N/A speed=N/A
Conversion failed!

I tried to look at sourcecode, but changing obvious places in
libavutil/hwcontext_qsv.c to sw implementation changed nothing, and

Error creating a MFX session: -9

was coming from libavcodec/qsv.c (I changed printed message a bit)

decoder also does not work

Any ideas how to convince ffmpeg to use this OneVPL implementation?
_______________________________________________

Perhaps stating the obvious: You can use the software, but in order for it to 
work properly it needs the hardware it was written for.
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