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Old 27th October 2017, 17:36   #326  |  Link
TD-Linux
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Join Date: Aug 2015
Posts: 34
Quote:
Originally Posted by benwaggoner View Post
I am baffled by the use of such an old x265 build. Even in placebo it'll run a ton faster than the current AV1 reference implementation. So it'd be trivial to rerun the test at the same time the final tests for AV1 are done for a presentation like this.

Are the different command lines used for the different codecs listed somewhere?
Yeah using the old version is not great (which is why I was sure to list it) I want to provide better x265 numbers before presenting numbers with something closer to the "final" codec (the "AV1" here is missing features too). Note it's probably far from the only issue comparing x265 and AV1 - both use very different reference frames and keyframe boosts so doing a comparison with metrics is quite hazard frought. The VP9 numbers are much more comparable. The x265 parameters were:

Code:
--preset placebo --no-wpp --bframes 16 --merange 256--min-keyint 1000 --keyint 1000 --no-scenecut --crf=$x
The bframes and merange options were determined through trial and error to improve x265's metric score. I've run x265 since but haven't tried to re-optimize these on a newer build.

This is done on the AWCY infrastructure. Here are two more recent results, still with the old x265 runs:

https://arewecompressedyet.com/?job=...3A43%3A40.468Z

with --tune psnr

https://arewecompressedyet.com/?job=...3A43%3A40.468Z
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