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17th June 2020, 16:52 | #2201 | Link |
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My 7900X (OC) can also play that video in 8K without drops, at 40% usage at most - straight in Chrome 83. Make sure its not your GPU that struggles downscaling the 8K video.
With Ryzen making 8 cores available to "mere mortals" for relatively low pricing, I don't think you need any particular "beast" right now, nevermind the next decade.
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18th June 2020, 02:04 | #2202 | Link | |
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AV1 is certainly going to be more parallizable than VP9. But how far have the best decoders gone so far? |
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18th June 2020, 04:00 | #2203 | Link | ||
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if there is a AV1 version i could try it with an R7 3700X which could yield up to ~2.5x more performance then a r5 2600 in this special case Quote:
Last edited by huhn; 18th June 2020 at 04:51. |
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18th June 2020, 08:17 | #2204 | Link | |
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I think I activated AV1 on YT, it was under /testtube or so. Just google it.
I used youtube-dl.exe to download the video, it was the av1 version. @nevcairiel I use Vivaldi and have currently over 100 tabs open xD It can have an effect on performance Quote:
Over 300fps for 4k is not bad I hope 10bit decoding will be faster on ARM soon too. My 4k fire tv stick struggles with 1080p 10bit video
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18th June 2020, 11:41 | #2206 | Link | |
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They probably will fill out the ARM32 NEON asm over time, though I'm not sure if the performance will match the ARM64 equivalent code path. 10 bit on x86 is another matter entirely - as far as I am aware there are zero SIMD assembly optimisations currently for AVX2, SSSE3 or SSE2 where 10+ bpc video is concerned. |
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18th June 2020, 13:35 | #2207 | Link | |
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The practical problem in ffvp9 is that it decided (to fit in FFmpeg's more static design) to only allow one threading type (frame or tile) instead of multiple concurrently (frame and tile) like dav1d does. That's the only reason dav1d scales better with multi-threading. We could have resolved that, but it was decided that ffvp9 was fast enough and it wasn't worth it. (I can explain libaom's and libvpx' threading models if you want to learn more, but since they are a subset of dav1d/ffvp9, I was assuming this would be enough. I'm not familiar with gav1's threading model.) |
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21st June 2020, 15:03 | #2209 | Link | ||
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MainConcept Brings Fast, Efficient AV1 Encoding to More Video Platforms
https://www.prnewswire.com/news-rele...301071452.html Quote:
https://code.videolan.org/videolan/dav1d/-/tags/0.7.1 Quote:
Last edited by Mr_Khyron; 21st June 2020 at 15:20. |
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23rd June 2020, 16:44 | #2210 | Link |
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It has some code that can run on the GPU, but from what I can gather it only increases power efficiency on mobile systems.
Whether this is because they only tested 8 bpc content which is optimized up the yin yang on most CPU SIMD ISA's at this point I don't know, I have yet to see a more comprehensive testing of the GPU code shown which encompasses 8 bpc and 10+bpc content separately. From what I can gather there is also not much code that runs on the GPU at this point, this could always change in the future. Last edited by soresu; 23rd June 2020 at 16:47. |
23rd June 2020, 22:26 | #2211 | Link | |
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Stuff like CABAC is not well suited to run on a GPU, so an all GPU compute decoder hasn't really been feasible or worthwhile. Last edited by benwaggoner; 26th June 2020 at 19:13. Reason: software<>hardware! |
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26th June 2020, 14:38 | #2212 | Link |
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You mean hardware, obviously.
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28th June 2020, 10:52 | #2214 | Link | |
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It doesn't seem like the GPU gets a chance to be too slow. By the way I tried these videos' 8k AV1/VP9 streams: https://www.youtube.com/watch?v=zCLOJ9j1k2Y https://www.youtube.com/watch?v=1La4QzGeaaQ Last edited by mzso; 28th June 2020 at 16:29. |
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28th June 2020, 11:41 | #2215 | Link |
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zen 1 and 1+ have a bad AVX/AVX2 implementation they need 2 cycles to do such a operation unlike intel and zen 2 which can do that in 1 giving them 2x the ipc in decoding of modern codecs.
these are 8k 60 this is to much for my CPU too it's not even close. edit:i take it back i get it barely working with EVR-CP. Last edited by huhn; 28th June 2020 at 11:50. |
9th July 2020, 21:57 | #2217 | Link |
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As for Intels Gen12 their Open source driver did enable AV1 decoding: https://github.com/intel/media-drive...3c0e9e945b8062
In one file it says MaxTile is 4096x2304, this coincides with the leak about Tigerlake 4k60 video. |
10th July 2020, 15:52 | #2219 | Link |
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Not even 8K 12 bit sounds strange, there is no real need for 12 bit. Actually it's similar to Gen9.5 which supports 8/10 Bit 4:2:0 VP9/HEVC, even though it did support 8K afaik. Apparently it's not a trivial VP9 copy and paste, you should be happy that at least one major GPU IHV is going to support AV1 this year even if it's not the super highest possible variant.
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10th July 2020, 17:22 | #2220 | Link | |
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For moving image content for humans to watch at a distance where they can comfortably see the action in all four corners of the screen, 8K is pretty much indistinguishable from 4K. No one is actually mastering premium content in 8K (some 8K cameras get used, but all post is done in 4K, and often 2K for VFX). 12-bit has some theoretical value, but it's not like there are native 12-bit panels to watch it on. Given all the dithering that goes on, 10-bit is sufficient in most cases. 12-bit's value would mainly to be to not have to worry about dithering in post and encoding with HDR, like how 10-bit pretty much eliminates those concerns with SDR. All that said, has anyone seen any compelling research on AV1 encoding in HDR or 4K? Pretty much everything I've read at outside of marketing and demos has been SDR and 1080p or lower. |
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