[CruNcher]

Originally Posted by Jamaika

Test Clare codec AV1 vs X165 is underestimated because preset is good, bpg has veryslow.
Preset for X265 is:
0.ultrafast
1.superfast
2.veryfast
3.faster
4.fast
5.medium (default)
6.slow
7.slower
8.veryslow
9.placebo
Preset for VPX/AOM is:
0. rt + 37% quality
5. good (default) + 50% quality
9. best + max.63% quality
I associate it mistakenly with the parameter VPX "cq-level". So you could set for veryslow quality VPX best + max.63%.

No one probably doesn't know what effect it has value of quality "min-q". The first frame is always a big mistake for added value for codec VPX and AV1.

Interesting is also why each encoder VPX&AOM has a different parameter of quality.
FFmpeg has CRF.
What possesses Adobe plugin 1.003? Must enter function "cq-level". Changing the value of quality means a change bitrate and the number of frames P. 37% is 2frames, 50% is 4 frames, 63% is 6 frames. It is a pity that libvpx isn't such fuction. Approached by a characteristic size of the frame to the X265. Changing good to best doesn't change the size of the bitrate, only the number of reference vectors in frame.
Edit: The function pass 2 is a falsification. There is no dynamic frame B. Analyzer video Elecard doesn't show that it has been implemented.

Huh ?

Image compression

All images are compressed losslessly and over a range of qualities for each codec:

BPG:
lossless: bpgenc -m 8 -f 420 -lossless -o [output] [input(PNG)]
between q=3 and q=45: bpgenc -m 8 -f 420 -q $q -o [output] [input(PNG)]

AV1:
lossless: aomenc --passes=2 --lossless=1 -o [output] [input(Y4M)]
between q=5 and q=63: aomenc --passes=2 --end-usage=q --cq-level=$q -o [output] [input(Y4M)]

Daala:
lossless: encoder_example -v 0 -o [output] [input(Y4M)]
between q=5 and q=85: encoder_example -v $q -o [output] [input(Y4M)]

FLIF:
lossless: flif -Q 100 [input(PNG)] [output]
between q=-329 and q=79, with a step of 12: flif -Q $q [input(PNG)] [output]

JPEG2000:
lossless: kdu_compress -no_info Creversible=yes -slope 0 -o [output] -i [input(PPM)]
between q=38912 and q=45056, with a step of 64: kdu_compress -no_info -slope $q -o [output] -i [input(PPM)]

JPEG XR:
lossless: JxrEncApp -d 1 -q 1 -o [output] -i [input(PPM)]
between q=5 and q=85: JxrEncApp -d 1 -q $q -o [output] -i [input(PPM)]

MozJPEG:
lossless: cjpeg -rgb -quality 100 [input(PNG)] > [output]
between q=5 and q=95: cjpeg -quality $q [input(PNG)] > [output]

WebP:
lossless: cwebp -mt -z 9 -lossless -o [output] [input(PNG)]
between q=5 and q=95: cwebp -mt -q $q -o [output] [input(PNG)]

Indeed if the default ist good it would be not the highest preset as bpg uses i wonder why clare decided this