Lossless AV1 encoding

birdie · 15th April 2024, 19:50

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?

Jamaika · 15th April 2024, 21:05

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

birdie · 15th April 2024, 21:55

I'm not sure how to read your message. I'm talking about encoding video.

Jamaika · 16th April 2024, 17:00

These are lossless photos. Video I don't know. I-frames

15th April 2024, 19:50	#1 \| Link
birdie Artem S. Tashkinov Join Date: Dec 2006 Posts: 345	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.

15th April 2024, 21:05	#2 \| Link
Jamaika Registered User Join Date: Jul 2015 Posts: 705	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.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

15th April 2024, 21:55	#3 \| Link
birdie Artem S. Tashkinov Join Date: Dec 2006 Posts: 345	I'm not sure how to read your message. I'm talking about encoding video.

16th April 2024, 17:00	#4 \| Link
Jamaika Registered User Join Date: Jul 2015 Posts: 705	These are lossless photos. Video I don't know. I-frames