Quote:
Originally Posted by jonatans
Perhaps around -qp 25 would be a good starting point for finding correspond quality and/or bitrate for this test case.
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Thanks jonathans. It means that qp is variable and should be adapted for every movie? If yes, then this is big disadvantage. Business wants one settings for all movies, which give similar quality (like crf).
I've made test again. Different sample of this movie. (I know that this movie is not HQ, specially)
I've uploaded xvc, av1 and y4m to :
https://drive.google.com/drive/folde...vX42bYkM5cp855
It seems that qp25 is ok
http://screenshotcomparison.com/comparison/128563
xvc encoded with params
Code:
./xvcenc -input-file 0007QDNTE7P37UMM-sample.y4m -output-file 0007QDNTE7P37UMM-sample_q25.xvc -max-keypic-distance 120 -qp 25 -threads 8 -verbose 1
av1:
Code:
aomenc.exe --frame-parallel=0 --tile-columns=3 --auto-alt-ref=1 --cpu-used=4 --tune=psnr --passes=2 --threads=4 --end-usage=q --cq-level=36 --kf-max-dist=120 --bias-pct=75 --test-decode=fatal -o 0007QXNOHNT8PWFC-sample_q36_c4_kf120.webm 0007QXNOHNT8PWFC-sample.y4m
And the result... xvc give better compression, but it is not so amazing.
0007QDNTE7P37UMM-sample_q25.xvc - 562.9 kB
0007QDNTE7P37UMM-sample_q36_c4_kf120.webm - 744,9 kB