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I just learned about AV1, and I decided that it would be better than h265 for my needs. I read this guide https://gitlab.com/AOMediaCodec/SVT-AV1/-/blob/master/Docs/Ffmpeg.md to get a basic understanding. My goal is to save space on my stored 4k H264 content, without noticeable quality loss. I'm using preset 5, but What CRF should I use for 4k Content, that is a good balance of visuals and efficiency for reasonable encode times, the above guide recommended 32 for 1080p is that good for 4k also?
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I recommend you do some tests I'd your own with FFMetrics.
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I just let ab-av1 automatically find a CRF that hits a VMAF target on a few samples.