пт, 8 дек. 2023 г., 13:57 Andrew Randrianasulu <[email protected]>:
> > > пт, 8 дек. 2023 г., 13:37 Terje J. Hanssen via Cin < > [email protected]>: > >> >> >> Den 03.12.2023 22:29, skrev Terje J. Hanssen: >> >> Already touched this topic barely in another thread >> https://lists.cinelerra-gg.org/pipermail/cin/2023-December/007346.html >> >> But so many SW and HW pieces are mentioned around, it is almost a >> full-time reading and study: >> VAAPI, MESA, VULKAN, Intel Quick Sync Video etc...... >> >> I realize my aging hardware which is fast enough for other tasks, needs >> some "AV1 upgrade", if possible. >> >> But first I wonder, what is expected possible to do (obtain) with AV1 >> de-/encoding on my existing 64bit hardware: >> >> 1) laptop 2018: Dell XPS 13-9370: quad core i7-8550U CPU (8. gen >> Kabylake) and Intel UHD Graphics >> >> 2) WS infinity: MSI Z170A mobo: quad core i7-6700K CPU (6. gen >> Skylake), NVIDIA GeForce GT-730 graphics >> >> >> A budget friendly first "AV1 HW upgrade" of the workstation 2) if >> possible, would be to add a new GPU as Intel Arc A380. >> But the question is if this will work at all on that much older (2015) >> Skylake platform with i7-6700K CPU? >> I've seen CPU bottlenecks has been mentioned and that Arc A380 is >> targeted at newer generations CPU ... >> >> >> Extracted from the first wikipedia reference below about Intel Alchemist >> GPUs: >> >> - Featuring 8 Xe-cores, the* A380 supports PCI Express 4.0* and has a >> total board power (TBP) of 75W. The graphics card is equipped with 6GB >> GDDR6 memory and a graphics memory interface of 96 bits, providing a >> memory >> bandwidth of 186GB/s. >> - Bus interface A380: PCIe 4.0 x8 and for >=A580: PCIe 4.0 >> x16 >> >> That is, the keyword here seems to be PCIe 4.0 bus speed as a requirement >> to utilize the Arc A380 GPU for HWA AV1 encoding (maybe also for other >> GPUs?) >> > > well, despite so much time spend looking at dev process for mesa3d I still > do not know full details and media encoder process. But isn't it like > putting uncompressed frame in vram (as long as you have enough of it - so > probably n raw frames between keyframe ideally?) let media engine chw on > it, pull resulting compressed bitstream out of vram via pci-express? > > So I speculate pcie bandwidth in itself will only matter if you compress > both big frame size and long keyframes, so dma engine on card must > constantly pump new raw frame data via bus. > > I saw some mention of big (resizeable) BAR as requirement for good > performance, but opengl/vulkan IMO a bit different because they send often > big amount of tiny objects (vertices) via bus for each frame. But may be > default 256 Mb in size bar feels a bit small for sending like 1 second of > 25 4k frames (300 mb/s)? > https://forums.gentoo.org/viewtopic-t-1165048.html?sid=1b9518b86afdcd1fa5e7710f16cd6893 not exactly about av1 in ffmpeg 6.1 but lists some components you need for vaapi/qsv encoder on Arc 380 - also from dmesg resizeable bar support is not essential ? > gpus today use their own memory paging system, so may be this add > additional restriction on how fast you can push frames to them. .... > > Also, windows and Linux drivers might differ ( I bet most reviews are from > windows land). > > May be someone will post linux review of this particular aspect of Arc > graphics, either video or text ... > > If this Suse Studio service still works may be you can compose your own > live image with all components required to test that and walk to some > offline place where you can testdrive new card .... { If weather feels > favourable enough - we have around -14 C airtemp so I and my dog prefer > short dashes around and back to warm place shortly} > > > My existing Skylake WS 2) above has PCie 3.0 only. >> >> PCIe 4.0 >> https://no.wikipedia.org/wiki/PCI_Express >> https://www.techreviewer.com/learn-about-tech/what-is-pcie-40/ >> >> Motherboards Support PCIe 4.0 >> https://www.makeuseof.com/best-budget-pcie-4-motherboards/ >> >> https://www.techreviewer.com/tech-answers/which-motherboards-support-pcie-40/ >> >> Maybe also information of interest for WS building will be clarified >> within a week, when Intel release their new "Meteor Lake, Core Ultra mobile >> processors(?) >> https://en.wikipedia.org/wiki/Meteor_Lake >> >> >> References: >> AV1 Encoding on a Budget: The Intel Arc A380 Approach >> >> https://medium.com/@contact_45426/av1-encoding-on-a-budget-the-intel-arc-a380-approach-d72367f2f349 >> >> https://history-computer.com/intel-arc-a380-full-review-of-intels-entry-level-gpu/ >> >> AV1 fixed-function hardware encoder is included in Alchemist GPUs as part >> of the Intel Quick Sync Video core. >> https://en.wikipedia.org/wiki/Intel_Arc#Alchemist >> https://en.wikipedia.org/wiki/AV1#Hardware >> >> https://en.wikipedia.org/wiki/Intel_Quick_Sync_Video#Hardware_decoding_and_encoding >> >> >> >> >> -- >> Cin mailing list >> [email protected] >> https://lists.cinelerra-gg.org/mailman/listinfo/cin >> >
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