overall, using something below preset 6, especially AV1, might be too extreme for pure CPU encoding in Full-HD.
Although I have been using ryzen 9 7950x for few days, The base is considered as 'reasonable costed' as there are 16 cores generic, instead of something Power and Efficient. There are some trade-offs between that liberty codec and some known pay codecs such as storage allocation, complexity of playing, bandwidth requirement, expenses during operation and etc.
It is said, AV1 is a form of dilemma or even worse. You save some money for royalty, highly welcome, with high storage allocation cost and higher initial hardware cost due to complexity of lossy compressing. I have been using 16 cores, this time, I use something very low, the low point is 5, if even lower, then I might have biiger pressure which I am going to test again.
Parameter used during test out
ffmpeg -framerate 24 -i %05d.png -c:v libsvtav1 -pix_fmt yuv420p10le -preset 5 -svtav1-params "tune=0:crf=23:asm=avx2" test1_crf23AV110bit_preset5.mp4
Output result
Output #0, mp4, to 'test1_crf23AV110bit_preset5.mp4':
Metadata:
encoder : Lavf59.34.101
Stream #0:0: Video: av1 (av01 / 0x31307661), yuv420p10le(tv, progressive), 1920x1080, q=2-31, 24 fps, 12288 tbn
Metadata:
encoder : Lavc59.51.101 libsvtav1
frame=14315 fps= 14 q=21.0 Lsize= 222976kB time=00:09:56.41 bitrate=3062.7kbits/s speed=0.575x
video:222943kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.014649%