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Old 29th May 2018, 04:42   #1081  |  Link
iwod
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I was surprised (in a good way) after visiting Netflix tech blog.

They make strong accent on VP9 in pretty every article that includes video compression topics. Good news for VP9.
Like here https://medium.com/netflix-techblog/...g-4b9464204830
or https://medium.com/netflix-techblog/...k-e19f1e3a277f

I can speak from my own experience about Netflix and VP9 on smartphone. Long battery life and very good quality. Thumb up.
Which is basically All Smartphone apart from iPhone.
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Old 29th May 2018, 13:39   #1082  |  Link
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Google is so sorry about Apple users that their own company doesn't care to support open formats. Netflix is next to be sorry about that and many others. What an unfair world for Apple company.
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Old 30th May 2018, 20:06   #1083  |  Link
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Google is so sorry about Apple users that their own company doesn't care to support open formats. Netflix is next to be sorry about that and many others. What an unfair world for Apple company.
I am pretty sure you are talking about VP9 here, and not the AV1 from Open Media Alliance.

And VP9 is less open then H.264. Free /= Open.
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Old 1st June 2018, 15:34   #1084  |  Link
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Old 2nd June 2018, 16:04   #1085  |  Link
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They make strong accent on VP9 in pretty every article that includes video compression topics. Good news for VP9.
Yep but then you'll find this
Quote:
Encoding parameters used in VP9-libvpx were taken from a previous study; its findings were presented at Netflix’s “Open house on royalty-free codecs” in Oct. 2016. Based on that study, which used the same set of 10 full-titles for testing as those chosen for the first experiment reported earlier, the best configuration to use is “fixed-QP, AQ-mode=0, CPU=0, best”, shown to produce highest quality both in terms of PSNR and VMAF quality metrics. The following figures show the effect in terms of average BD-rate loss when choosing different parameters in VP9-libvpx encoding.
as they don't even complaing enabling alt-ref frames for the 2 pass test which give a HUGE quality boost, not even playing with qcomp.
So what their comparisons mean?
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Old 11th June 2018, 10:23   #1086  |  Link
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Old 13th June 2018, 02:42   #1087  |  Link
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Yep but then you'll find this

as they don't even complaing enabling alt-ref frames for the 2 pass test which give a HUGE quality boost, not even playing with qcomp.
So what their comparisons mean?
Maybe. I didn't know about that.
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Old 26th June 2018, 09:19   #1088  |  Link
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Old 20th July 2018, 14:32   #1089  |  Link
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Old 31st July 2018, 15:41   #1090  |  Link
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Old 9th August 2018, 15:02   #1091  |  Link
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Old 14th September 2018, 13:51   #1092  |  Link
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Old 14th September 2018, 14:56   #1093  |  Link
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VPx v1.7.0-1002-gb3a837cbf (MSYS2; MinGW32: GCC 7.3.0 / MinGW64: GCC 8.2.0)
Any meaningful improvements these days?
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Old 14th September 2018, 15:05   #1094  |  Link
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A lot cleanups, fixes, improvements ... but I don't know any especially "meaningful" changes in detail, did not study this list.
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Old 23rd September 2018, 17:32   #1095  |  Link
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Old 7th October 2018, 22:02   #1096  |  Link
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Old 2nd November 2018, 14:07   #1097  |  Link
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Old 13th December 2018, 16:18   #1098  |  Link
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Old 14th December 2018, 01:15   #1099  |  Link
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Netflix dropped a new article.
H264/H265/VP9 comparison using HVMAF with reference encoders and production encoders.
libvpx is doing mediocre'ish, EVE does well
Relative Bitrate savings for low and high quality using three test sets:



https://medium.com/netflix-techblog/...e-d45d0183ca95

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Old 14th December 2018, 02:53   #1100  |  Link
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Netflix dropped a new article.
H264/H265/VP9 comparison using HVMAF with reference encoders and production encoders.
libvpx is doing mediocre'ish, EVE does well
Relative Bitrate savings for low and high quality using three test sets:



https://medium.com/netflix-techblog/...e-d45d0183ca95
Now VMAF gives different scores for mobile, 1080p, and UHD screen sizes. They don’t seem to specify which they used here.
Or perhaps this was done with an older VMAF implementation?

I’m having a hard time figuring out what settings they are actually using. It sounds like it’s fixed QP, with one psychovisual parameter added for each “perceptual” tuned mode. So are x264 and x265 fixed QP encodes with psy-rd=1? Is aq-mode=0? And really QP instead of CRF? And when aiming for PSNR, why not --tune psnr which is EXACTLY for that scenario! Psy-rd=0 is NOT tuning for PNSR!

And odd libvpx gets to use 2 passes while everything else is 1. Although that wouldn’t really matter that much if it’s truly a fixed QP encode with no rate control. But if using --tune psnr for x26? multipass encoding should help mean and harmonic mean PSNR.

This seems a quite poor study for predicting the real-world subjective quality different encoders can produce, as it will substantially underestimate the achievable perceptual quality the x26x codecs can deliver in the real world. I’d expect just adding --tune film to x264 would improve VMAF a bunch in the perceptual case.

It sort of conflates encoder psychovisual tuning and bitstream capabilities. I imagine a port of x264’s psyovisual stuff to a vp9 encoder would offer big improvements, like was seen when x264 algorithms got ported into x265.
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