Comment by mananaysiempre
2 years ago
> AV1 is more magic with better licensing.
AV1 is bloody awful to encode in software.
I was recording videos of lectures (a slowly moving person against a whiteboard with thin sharp lines on it, in a questionably well-lit room) and needed to encode them to smallish 720p files to be posted somewhere (ended up uploading them to the Internet Archive). This is not something that x264’s default encoding profiles do well on, but with a day or two of fiddling with the settings I had something I could run on my 2014-era iGPU-only laptop the night after the lecture and have the result up the next day.
By contrast, libaom promised me something like a week of rendering time for the three hours of video. Perhaps this could be brought down (my x264 fiddling got me veryslow-comparable results several times faster), but the defaults were so bad I couldn’t afford to experiment. (This was some four years ago. Things have probably gotten better since then, but I don’t expect miracles.)
Not at all my experience, 673 movies and counting. I encode at around 10 to 13x with my 12900K using svt-av1.
My command:
ffmpeg.exe -i file.mp4 -r 23.976 -vf scale=1280:720 -c:v libsvtav1 -pix_fmt yuv420p10le -crf 30 -preset 10 -g 600 -c:a libopus -b:a 96k -ac 2 -c:s copy -map 0 out.mp4
Try it.
while the lectures in they were encoding would definitely look fine with these settings, I have to question your baseline for quality if you’re watching full Hollywood movies encoded at CRF 30.
I'm watching these on my second monitor when I play guitar.
Isn’t that the recommended starting point for AV1? What’s an appropriate high quality starting point?
1 reply →
> -crf 30
That would do it.
SVT-AV1 is a much faster AV1 encoder: https://gitlab.com/AOMediaCodec/SVT-AV1/
> libaom promised me
The reference AOM was never a practically useful encoder even 4 years ago.
> I couldn’t afford to experiment
Pity as you'd discover a better encoder...