<div dir="auto"><div><br><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">пт, 8 дек. 2023 г., 13:57 Andrew Randrianasulu <<a href="mailto:randrianasulu@gmail.com">randrianasulu@gmail.com</a>>:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div><br><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">пт, 8 дек. 2023 г., 13:37 Terje J. Hanssen via Cin <<a href="mailto:cin@lists.cinelerra-gg.org" target="_blank" rel="noreferrer">cin@lists.cinelerra-gg.org</a>>:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>
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<div>Den 03.12.2023 22:29, skrev Terje J.
Hanssen:<br>
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<blockquote type="cite">
Already touched this topic barely in another thread<br>
<a href="https://lists.cinelerra-gg.org/pipermail/cin/2023-December/007346.html" rel="noreferrer noreferrer" target="_blank">https://lists.cinelerra-gg.org/pipermail/cin/2023-December/007346.html</a><br>
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But so many SW and HW pieces are mentioned around, it is almost a
full-time reading and study:<br>
VAAPI, MESA, VULKAN, Intel Quick Sync Video etc......<br>
<br>
I realize my aging hardware which is fast enough for other tasks,
needs some "AV1 upgrade", if possible.<br>
<br>
But first I wonder, what is expected possible to do (obtain) with
AV1 de-/encoding on my existing 64bit hardware:<br>
<br>
<blockquote><font face="monospace">1) laptop 2018: Dell XPS
13-9370: quad core i7-8550U CPU (8. gen Kabylake) and Intel
UHD Graphics</font><br>
<br>
<font face="monospace">2) WS infinity: MSI Z170A mobo: quad
core i7-6700K CPU (6. gen Skylake), NVIDIA GeForce GT-730
graphics</font><br>
</blockquote>
<br>
A budget friendly first "AV1 HW upgrade" of the workstation 2) if
possible, would be to add a new GPU as Intel Arc A380.<br>
But the question is if this will work at all on that much older
(2015) Skylake platform with i7-6700K CPU?<br>
I've seen CPU bottlenecks has been mentioned and that Arc A380 is
targeted at newer generations CPU ... <br>
</blockquote>
<br>
Extracted from the first wikipedia reference below about Intel
Alchemist GPUs:
<ul>
<li>Featuring 8 Xe-cores, the<b> A380 supports PCI Express 4.0</b>
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.</li>
<li>Bus interface A380: PCIe 4.0 x8 and for >=A580:
PCIe 4.0 x16 </li>
</ul>
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?)<br></div></blockquote></div></div><div dir="auto"><br></div><div dir="auto">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?</div><div dir="auto"><br></div><div dir="auto">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.</div><div dir="auto"><br></div><div dir="auto">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)?</div></div></blockquote></div></div><div dir="auto"><br></div><div dir="auto"><a href="https://forums.gentoo.org/viewtopic-t-1165048.html?sid=1b9518b86afdcd1fa5e7710f16cd6893">https://forums.gentoo.org/viewtopic-t-1165048.html?sid=1b9518b86afdcd1fa5e7710f16cd6893</a><br></div><div dir="auto"><br></div><div dir="auto">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 ?</div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div dir="auto"><br></div><div dir="auto">gpus today use their own memory paging system, so may be this add additional restriction on how fast you can push frames to them. ....</div><div dir="auto"><br></div><div dir="auto">Also, windows and Linux drivers might differ ( I bet most reviews are from windows land).</div><div dir="auto"><br></div><div dir="auto">May be someone will post linux review of this particular aspect of Arc graphics, either video or text ...</div><div dir="auto"><br></div><div dir="auto">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}</div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>
My existing Skylake WS 2) above has PCie 3.0 only.<br>
<br>
PCIe 4.0<br>
<a href="https://no.wikipedia.org/wiki/PCI_Express" rel="noreferrer noreferrer" target="_blank">https://no.wikipedia.org/wiki/PCI_Express</a><br>
<a href="https://www.techreviewer.com/learn-about-tech/what-is-pcie-40/" rel="noreferrer noreferrer" target="_blank">https://www.techreviewer.com/learn-about-tech/what-is-pcie-40/</a><br>
<br>
Motherboards Support PCIe 4.0<br>
<a href="https://www.makeuseof.com/best-budget-pcie-4-motherboards/" rel="noreferrer noreferrer" target="_blank">https://www.makeuseof.com/best-budget-pcie-4-motherboards/</a><br>
<a href="https://www.techreviewer.com/tech-answers/which-motherboards-support-pcie-40/" rel="noreferrer noreferrer" target="_blank">https://www.techreviewer.com/tech-answers/which-motherboards-support-pcie-40/</a><br>
<br>
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(?)<br>
<a href="https://en.wikipedia.org/wiki/Meteor_Lake" rel="noreferrer noreferrer" target="_blank">https://en.wikipedia.org/wiki/Meteor_Lake</a><br>
<br>
<blockquote type="cite"> <br>
References:<br>
AV1 Encoding on a Budget: The Intel Arc A380 Approach<br>
<a href="https://medium.com/@contact_45426/av1-encoding-on-a-budget-the-intel-arc-a380-approach-d72367f2f349" rel="noreferrer noreferrer" target="_blank">https://medium.com/@contact_45426/av1-encoding-on-a-budget-the-intel-arc-a380-approach-d72367f2f349</a><br>
<a href="https://history-computer.com/intel-arc-a380-full-review-of-intels-entry-level-gpu/" rel="noreferrer noreferrer" target="_blank">https://history-computer.com/intel-arc-a380-full-review-of-intels-entry-level-gpu/</a><br>
<br>
AV1 fixed-function hardware encoder is included in Alchemist GPUs
as part of the Intel Quick Sync Video core.<br>
<a href="https://en.wikipedia.org/wiki/Intel_Arc#Alchemist" rel="noreferrer noreferrer" target="_blank">https://en.wikipedia.org/wiki/Intel_Arc#Alchemist</a><br>
<a href="https://en.wikipedia.org/wiki/AV1#Hardware" rel="noreferrer noreferrer" target="_blank">https://en.wikipedia.org/wiki/AV1#Hardware</a><br>
<a href="https://en.wikipedia.org/wiki/Intel_Quick_Sync_Video#Hardware_decoding_and_encoding" rel="noreferrer noreferrer" target="_blank">https://en.wikipedia.org/wiki/Intel_Quick_Sync_Video#Hardware_decoding_and_encoding</a><br>
<br>
<br>
</blockquote>
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