Evaluation of HEVC decoders (SW, Hybrid and HW)

[Klaus1189]

Originally Posted by mariner

8k mpc playback.

While DXVA checker suggested these 8k clips are well behaved, mpc tells a different story. What's going on?

Originally Posted by NikosD

None of your screenshots are visible.

Doom9, like all forums actually, is very slow approving attachments like these.

Like NikosD already pointed out, we cannot open your files.
Do it like that:
I created a screenshot, here you can see I can not open your files

[littleD]

Originally Posted by mariner

8k mpc playback.

While DXVA checker suggested these 8k clips are well behaved, mpc tells a different story. What's going on?

Win10 hd620 latest drivers

latest mpc hc dxva2 native in lav
4k 10bit hdr 60fps plays fluently
8k 8bit 24 fps plays fluently but its on the edge
8k 8bit 60 fps is slow (not so much, but visible desync with audio)

Dxva cb or d3d11 is slow with intel and lav filters so do not use those options

but using win10 Movies and Tv app i get
8k 8bit 60fp fluently wit rare/occasional glitch. This app uses d3d11 mft filter



I cannot download HDR files from Youtube, only 8k 8bit. Is this hdr real at all? Does chrome cheat or changing metadata or what.

[nevcairiel]

A fully optimized D3D11 video playback chain is the most efficient you can get on a PC. Unfortunately DirectShow is too old to really support that out of the box. You might be able to achieve some improvements using D3D11 native in LAV Video with madVR, but madVR internally still uses D3D9 a lot, so that loses a bit of the efficiency again there, because the image needs to be transfered from D3D11 to D3D9 again.

[NikosD]

Originally Posted by littleD

I cannot download HDR files from Youtube, only 8k 8bit. Is this hdr real at all? Does chrome cheat or changing metadata or what.

It seems that nobody can.

But they are real for sure at least for 4K, because my 4K HDR10 AndroidTV plays them fine as HDR clips using YouTube with real and obvious difference from 8bit non HDR clips.

@nevcairiel
Good post.

[wanezhiling]

https://communities.intel.com/thread/128950
I hate intel..

[nevcairiel]

You can definitely download 4K HDR streams with youtube-dl. Just 8K seems to be either hiding or in fact only be available in 8-bit SDR.

[littleD]

Thanks nevcairiel for this clarifications. Since almost all praise d3d11 then it must be intel drivers or hardware shortcoming. I will try madvr with some fast downscaling algorithm and see results Also Madvr gives proper colors with hdr on laptop screen. Evr custom not :/

my last test with mpc
8k 10bit hdr 24 fps file is fluid in playback on intel hd620
Sample from vimeo


EDIT:

How about to make mpc hc shader: rec. 2020 >> 709 (HD) or whatever renderer could expect???
Just to correctly display colours in EVR Custom?

[nevcairiel]

D3D11 is definitely slower right now if you use it without madVR, because that results in D3D11 copy-back, which is for some reason a tad bit slower then DXVA2 copy-back even. There are some technical reasons for it being slower then DXVA2 copy-back, but I didn't expect them to have such a huge impact - but I guess an Intel iGPU which uses system memory feels it the most.

[mariner]

Originally Posted by nevcairiel

A fully optimized D3D11 video playback chain is the most efficient you can get on a PC. Unfortunately DirectShow is too old to really support that out of the box. You might be able to achieve some improvements using D3D11 native in LAV Video with madVR, but madVR internally still uses D3D9 a lot, so that loses a bit of the efficiency again there, because the image needs to be transfered from D3D11 to D3D9 again.

Greetings nevcairel.

Been testing hevd clips with HD620 in w10:

1. When D3D11 option is selected in LAV filters, mpc reports dxva not in use, and cpu usage hits 100%.

2. The D3D11 option is not available in mpc's internal LAV filters.

Are these expected behavior?

Many thanks and best regards,

[huhn]

try it again with this version: https://github.com/clsid2/mpc-hc/releases

[alex1399]

The win10 Movies and Tv app isn't using D3D11 mft filter but some sort of mvd filter stuff called msmpeg2vdec.dll as shown in the filter chain by GraphStudioNext. The image quality is terrible. That's why it is so fast.

No, the crappy rendering stuff is out of the question to affect the decode stuff. MS made something too cheap to make it fast.

[huhn]

a decoder for a modern codec should not show any difference in image quality what give you the idea the decoder is the reason for the lowered quality?

[littleD]

Originally Posted by alex1399

The win10 Movies and Tv app isn't using D3D11 mft filter but some sort of mvd filter stuff called msmpeg2vdec.dll as shown in the filter chain by GraphStudioNext. The image quality is terrible. That's why it is so fast.

No, the crappy rendering stuff is out of the question to affect the decode stuff. MS made something too cheap to make it fast.

C'mon GSN cannot use media transform, can it?

Edit:
Dxvachecker shows some hints. In d3d11 decoding benchmark, both lavfilters and windows decoder are equally fast. But in playback benchmark, lav filters use 20% video engine while mt decoder over 80%. Such situation gives lower framerate in mphc than in windows app. Im sure lav outputs best quality possible. But comparing things and drawing conclusions aren't bad right? According to new hardware monitor in newest win10, the shared graphic memory is saturated when d3d11 enabled and 8k video played. Shared Graphic ram is full filled with some data. Maybe transfer between small GPU Ram and shared System memory is very costly. Maybe nevcairiel can lower memory requirements or use some texture compression to speed up things at 8k? I dont know where it comes from but win10 shows shared 4GB gpu memory on intel. During mft 8k decoding its half filled.

[foxyshadis]

Originally Posted by Klaus1189

Like NikosD already pointed out, we cannot open your files.
Do it like that:
I created a screenshot, here you can see I can not open your files

I really wish someone would report these attachment posts, even if it's not the OP. It's not the workflow I would have chosen, but it's the only one I have until I have time to browse over the weekends.

[pirlouy]

Maybe this subforum needs another moderator, someone well-recognised and quite active like nevcairiel or clsid for example ?

[nevcairiel]

No thanks

[NikosD]

Actually, this thread doesn't need a moderator.

It's self moderated by the members writing here and the OP does a little moderation, like in all threads.

Please, don't try to make things look like complicated.

[pirlouy]

Like if your thread was the subforum.
It was a general statement about screenshot approval.

[mariner]

8K playback on w10: MTV vs DXVA Checker vs MPC

Test system: Stock i7 7500u/HD620/16GB DDR3 1600 RAM/2k display
OS: w10.1803.285, pagefile disabled.

1. While HD620 can decode 8K HEVC10bit in hardware, MTV plays the 59fps 4in1 clip in slow motion, while MPC and Potplayer cannot display the video. What does the creator of the clip use for playback?

2. The 8K HEVC8bit LondonEye test clip is too short to allow any meaningful conclusion drawn. Longer samples most welcome.

3. 8K VP9 8bits: Test sample used Yellowstone is a randomly selected 8k 59fps yt clip (those numbered 272).
(a) MTV: Plays smoothly, but there could be a hint of video lag at the end. Clip too short to be conclusive. Is there a way to check frame rate in MTV?

(b) DXVA Checker:
(i) Playback performance benchmark comes in lower that playback benchmark. It is also 1/3 slower than w7's benchmark.
(ii) While playback is smooth for both LAV filters and MF decoder, video soon lags behind audio. LAV actually outperforms MF here.
(iii) Does this mean a different decoder unidentified by DXVA Checker is used by MTV for playback?

(c) MPC, POT and VLC; Can't handle any 8K clip. VLC suffers from decoding artifacts.

4. Suggestions to tweak the system for better performance most welcome.

[Klaus1189]

Originally Posted by foxyshadis

I really wish someone would report these attachment posts, even if it's not the OP. It's not the workflow I would have chosen, but it's the only one I have until I have time to browse over the weekends.

I don't understand, did I something wrong?
But I can't watch the attachments, and
again from @mariner, still pending ...

@mariner
we can't open your uploaded files, use any other file hoster, like google drive or whatever ...

Originally Posted by Klaus1189

Like NikosD already pointed out, we cannot open your files.
Do it like that:
I created a screenshot, here you can see I can not open your files

click on red "screenshot"