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Old 15th April 2024, 19:50   #1  |  Link
birdie
Artem S. Tashkinov
 
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Lossless AV1 encoding

SVT-AV1 doesn't support it.

Rav1e neither.

libaom-av1 in my own testing (yuv420p10le source, ffmpeg 6.1.1 params: -c:v libaom-av1 -crf 0 -aom-params lossless=1; libaom-3.8.2) produces lossless output only for I (key) frames.

How did I verify?
Code:
ffmpeg -i input.mp4  -f framemd5 input.txt
ffmpeg -i output.mp4 -f framemd5 output.txt
Are there any free lossless AV1 encoders?

Last edited by birdie; 15th April 2024 at 20:01.
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Old 15th April 2024, 21:05   #2  |  Link
Jamaika
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https://gitlab.com/AOMediaCodec/avm/-/commits/main
av2enc_avx.exe -q 100 -444 -size 280x420 -effort 7 -thread 4 -tune ssim input.png/jxl/tiff/wp2 -d output.av2
avifenc_avm_avx.exe -c avm -l -d 8 -y 444 -r full -s 7 -j 4 input.jpg output.avif

Last edited by Jamaika; 15th April 2024 at 21:08.
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Old 15th April 2024, 21:55   #3  |  Link
birdie
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I'm not sure how to read your message. I'm talking about encoding video.
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Old 16th April 2024, 17:00   #4  |  Link
Jamaika
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These are lossless photos. Video I don't know. I-frames
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Old 24th April 2024, 20:05   #5  |  Link
benwaggoner
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Quote:
Originally Posted by Jamaika View Post
These are lossless photos. Video I don't know. I-frames
The benefit of interframe encoding for natural image content is a lot smaller for lossless than for lossy. Encoding and decoding are much faster as well.

It's quite common for distribution encoders to not support lossless. As the original reference encoder, I imagine libaom would support it.

What's your scenario for lossless interframe AV1 encoding?
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