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In these tests SVT-AV1 beats x265 on quality:
- FullHD: http://compression.ru/video/codec_comparison/2022/main_repor...
- FullHD 10-bit: http://compression.ru/video/codec_comparison/2022/10_bit_rep...
- 4K: http://compression.ru/video/codec_comparison/2022/4k_report....
SVT-AV1 has seen a number of speed ups in recent releases:
https://gitlab.com/AOMediaCodec/SVT-AV1/-/releases
The hardware encoders are very fast and generally better than x264 (but not by as much as you'd think with the x264 slow preset).
In addition, there are threaded AV1 encoders you may be overlooking, like SVT-AV1. For non-realtime, my favorite is av1an, which also yields better quality than is possible from aomenc: https://github.com/master-of-zen/Av1an
Back when I still cared about saving disk space, I made a cluster of NVidia Jetson Nanos running in a docker swarm configuration [1], but honestly even when you have six computers working at once, H264 on a single computer is still often faster.
On the Jetson Nanos I was lucky to get maybe 1fps in ffmpeg using VP9. Multiply that by six boards and that's about 6fps in total; ffmpeg running x264 in software mode was getting around 11fps on a single board, not even counting using the onboard encoder chip, meaning that I was getting better performance from one board using x264 than all six using VP9.
Now obviously this is a single anecdote on specific hardware, so I'm not saying that this applies to every single case, but it's a big reason why I personally have not used VP9 for anything substantial yet.
[1] https://gitlab.com/tombert/distributed-transcode