[thot_experiment]

Encoding video on CPU is a no-go, AV1 is only supported on Alchemist IIRC. Certainly no hardware I possess has accelerated AV1 encode. I can do HEVC at 8x, SVT-AV1 manages 0.5x for the same file. There's just no comparison.

[peutetre]

On which preset for SVT-AV1? One of the strengths of SVT-AV1 is the presets offer a very wide trade off between quality and complexity. See the chart here:

https://engineering.fb.com/2023/02/21/video-engineering/av1-...

If you try a preset like 8 you may find you get good enough quality and a fast enough encode at a good enough bitrate. Some encoding guides:

https://gitlab.com/AOMediaCodec/SVT-AV1/-/blob/master/Docs/F...

https://trac.ffmpeg.org/wiki/Encode/AV1

You'll have to play around with the parameters to get the results you want. Try 5 minute clips until you're happy with it.

And use SVT-AV1 2.2 since that has more performance improvements:

https://www.phoronix.com/news/SVT-AV1-2.2-Released

[thot_experiment]

Even using -preset 12 and it's still 8x slower than hevc_nvenc. Encoding on CPU just isn't viable, not to mention the enormous perf impact on everything else running on my computer vs next to no perf impact when I use nvenc.

[peutetre]

It's always going to be slower than a hardware encoder.

I have an AMD Ryzen 7 7840U laptop which has hardware AV1 encoding. If I use preset 8 with SVT-AV1 on a 1080p encode I get 30 frames per second:

ffmpeg.exe -i "input.mp4" -c:v libsvtav1 -pix_fmt yuv420p10le -crf 40 -preset 8 -g 240 -svtav1-params tune=0 -c:a libopus -b:a 128k av1.mp4

With preset 12 I get 143 fps. With preset 10 I get 84 fps.

If I use the hardware encoder I get anywhere from 15 fps to 589 fps depending on the settings I use. I get 103 fps with this:

ffmpeg.exe -i "input.mp4" -c:v av1_amf -pix_fmt yuv420p -quality high_quality -preencode true -b:v 4M -c:a libopus -b:a 128k av1.mp4

Hardware encoder parameters: https://github.com/GPUOpen-LibrariesAndSDKs/AMF/wiki/AMF%20E...