Encoding Discussion Megathread (ffmpeg, Handbrake, AV1, etc...)

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Anybody have experience with mixed acceleration encoding?

Thus far, I've been able to do a mixed encode with libsvtav1 (and will check my results after the encode is complete) like this:

Code:

ffmpeg -y -hide_banner -v verbose -stats \
  -init_hw_device vaapi=hw:/dev/dri/renderD129 -init_hw_device opencl=hw1@hw -filter_hw_device hw1 \
  -i "${i}" \
  -filter:v:0 "yadif=mode=1,hwupload=extra_hw_frames=64,scale_opencl=h=720:w=-1:algo=lanczos,nlmeans_opencl=1.0:7:5:3:3,hwdownload,format=yuv420p," \
  -c copy -c:v:0 libsvtav1 -pix_fmt yuv420p10le \
  -svtav1-params "preset=2:crf=18:tune=0:film-grain=10:lookahead=120" \
  -c:a libopus -b:a:0 160k -ac:a:0 2 \
  out_file.mkv; done

The draws are being able to use lanczos for scaling and nlmeans for denoising, both better than defaults (supposedly), but unavailable with QSV. I guess I'm wondering if it's feasible to do mixed-acceleration encoding with QSV for decode/encode and OpenCL for filtering. Something like this...

Code:

ffmpeg -y -hide_banner -v verbose -stats \
  -init_hw_device vaapi=hw:/dev/dri/renderD129 -init_hw_device qsv=qsv@hw -init_hw_device opencl=ocl@hw \
  -hwaccel qsv -filter_hw_device ocl \
  -i "${i}" \
  -filter:v:0 "yadif=mode=1,hwupload=extra_hw_frames=64,scale_opencl=h=720:w=-1:algo=lanczos,nlmeans_opencl=1.0:7:5:3:3,hwdownload,format=yuv420p," \
  -c copy -c:v:0 libsvtav1 -pix_fmt yuv420p10le \
  -svtav1-params "preset=2:crf=18:tune=0:film-grain=10:lookahead=120" \
  -c:a libopus -b:a:0 160k -ac:a:0 2 \
  out_file.mkv; done

Or is this where derive device comes in handy? I think VA-API has to be used as the source for OpenCL rather than QSV but I'm not sure...any thoughts before I go down this rabbit hole?