this post was submitted on 26 Oct 2024
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Oh that's a great tip, I set it to "indistinguishable" and it 3x-ed the (almost) same gameplay clip, but it does look the best so far. But if what you are saying is true, with the encoding the previous encoder's artifacts, doesn't that mean I should record in lossless?
I did try a video of my desktop doing almost nothing, and AV1 rf23 compressed it 17x. That's nice. I'll now try re-coding this "indistinguishable" h264 preset video and to record a lossless one and to re-code that as well.
From a technical level you should use something lossless in this situation, but it really quickly becomes impractical. Actually lossless 1080p60 is going to be something like 500mbps, so if you're playing for an hour I hope you have a spare 2tb drive laying around. The artifacts in really high bitrate compressed video are so minimal that they basically don't matter. Often codecs do noise removal first thing so whatever minor artifacts still exist will get smeared over by that anyway.
Also when you are testing make sure there's some movement in the video. AV1 especially has modes for presentations and things that basically make a PowerPoint, so sizes might be unrealistic if you're just recording your desktop. I don't think that gets enabled in handbrake but it's been a while since I looked.
I settled for this:
ffmpeg -i "$file" -map 0:0 -c:v libsvtav1 -preset 3 -crf 23 -maxrate 85M -map 0:a -c:a copy "${file%.mp4}-av1.mp4" -y
The files is still very large, but you can't notice any artifacts or any blurry parts, I transcode it with 7fps.