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25th September 2019, 03:58 | #1821 | Link | |
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https://www.techspot.com/news/81905-...l-time-8k.html So if you only need 30fps or 24fps, or perhaps 50fps or 25fps for 50Hz territories, then you could get away with a considerably lower CPU core count. Heck even for 60fps you could probably get away with a 48 core Epyc since, if the multi-threaded encoding scaling was 100%, you'd be seeing 59.25fps on a 48core Epyc. However, since multi-threaded encode scaling almost never perfectly scales with core-count, and since CPUs with fewer cores tend to also have higher base clocks, it'd be quite likely that you could even see slightly above the required 60fps from a "mere" 48core Zen2 Epyc processor.
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25th September 2019, 08:46 | #1822 | Link | |||
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I'm still not sold on HDR for live content tbh, I have played around with both PQ and HLG and both comes with backwards comparability to SDR issues and complexity, and to be frank the live productions I've seen had issues even i HDR. I'm all for "HDR" as a tech, but when it comes to real world live productions it creates a lot of headache, maybe to much for it to ever become mainstream. Something that just going 10bit (which productions in most cases already are) and just increasing the colorspace doesnt (rec2020 specc), and imo is good enough, especially on a high contrast tv-set like an oled. Quote:
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Last edited by excellentswordfight; 25th September 2019 at 09:24. |
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25th September 2019, 18:09 | #1823 | Link |
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If broadcasters were that concerned with quality and bitrate, then they wouldn't be pushing to broadcast 8k in the first place.
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26th September 2019, 09:56 | #1824 | Link |
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Broadcom BCM7218X STB SoC Comes With AV1 Hardware Decoding
https://www.cnx-software.com/2019/09...coding-wifi-6/ |
27th September 2019, 19:04 | #1826 | Link |
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I get 11fps with a 1080p BD source. CPU ryzen 2600. Not bad.
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29th September 2019, 17:33 | #1828 | Link | |
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And they're even testing 10bit AV1 decoding in dav1d! This makes me very happy since, from previous testing, I actually found dav1d's 10bit decode performance on typical consumer CPU thread counts (2 to 8 threads) to be slower than the reference AV1 decoder, so I'll be keeping an eye out for any future performance gains for 10bit AV1 decoding. (for reference, their most recent review had used dav1d v0.3.0 and measured performance by seconds with 8bit only)
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29th September 2019, 21:53 | #1829 | Link | |
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AVX2. SSSE3. NEON. Nevcariel mentioned something about 10 bit content not being available at the moment (broadcast, not test content ala Chimera), so I doubt it's a priority while there are still missing gaps in the 8 bit SIMD code, which there still is on NEON at the very least. Last edited by soresu; 30th September 2019 at 00:52. |
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30th September 2019, 01:22 | #1830 | Link |
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Well, non yar-har-fiddle-dee-dee content anyway.
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30th September 2019, 18:59 | #1831 | Link | |
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An open question would be at what bitrate an 8K signal would look better than a 4K signal. Being able to spend 4x the MIPS per pixel in 4K can be material, and it takes pretty low QPs to preserve detail in an 8K frame that wouldn't be in a 4K downconvert. Practical 8K could well wait for the VVC codec. I've not seen much AV1 in 8K, but only 20% better than HEVC isn't likely to be sufficient. "8K in 4K bandwidth" is a good story, just like HEVC gave "4K in 1080p bandwidth" versus H.264. |
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30th September 2019, 19:03 | #1832 | Link | |
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But when you've got a good HDR PQ source, HDR PQ output can look great; much better than SDR at the same bitrate. |
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1st October 2019, 00:05 | #1833 | Link | |
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Likewise HEVC is at best hitting 70-75% reduction vs AVC for 4K, and even then x265 does not seem to be quite living up to that currently given the recent MSU test results, though maybe I read them wrong? Last edited by soresu; 2nd October 2019 at 01:05. |
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3rd October 2019, 19:08 | #1834 | Link |
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Even more SVT-AV1 v0.7 benchmarks from Phononix, this time all on the i9-7980XE but testing performance between different OSes and distros (including Windows 10):
https://www.phoronix.com/scan.php?pa...creators&num=4
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4th October 2019, 18:21 | #1835 | Link | |
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new bitrate=old bitrate * (width/oldwidth * height/oldheight)^0.75. But with modern codecs that scale better to high resolutions, the factor is going to be lower/ maybe 2/3rds? That works out to about 2x more bits, which gets covered by the 2x efficiency improvement. Also, newer codecs have less objectionable distortions, so PSNR underestimates subjective improvements due to error-suppression features like in-loop deblocking. AV1 has a ton of those, which is presumably why we are seeing its greatest strengths at lower bitrates. This is all ballpark. But H.264 gave 720p at roughly 480p MPEG-2 bandwidth and HEVC gave 4K at roughly 1080p H.264 bandwidth. |
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5th October 2019, 08:59 | #1836 | Link |
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libgav1 new AV1 decoder from Google. Focus on android OS.
https://chromium.googlesource.com/codecs/libgav1/ |
5th October 2019, 22:15 | #1837 | Link | |
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And Phoronix has already managed to benchmark it against dav1d v0.4.0 on a bunch of different AMD and Intel CPUs: https://www.phoronix.com/scan.php?pa...V1-performance
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6th October 2019, 01:06 | #1838 | Link |
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Yeah seems libgav1 has a long way to go for x86 at least.
ARM NEON is almost fully accelerated for 8 bit video in dav1d, so until Phoronix does some tests with ARM cores I'd assume a similar result there too. On a different note, I've been keeping an eye on the experimental AOM/AV2 code branch for a while now. Seems like a fair amount of work has gone in to it already - though judging any current cumulative improvement is difficult without an obvious AWCY link that compares the AOM master to the experimental code. Can anyone point me to something here? |
6th October 2019, 02:04 | #1839 | Link | |
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8th October 2019, 16:33 | #1840 | Link |
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AV1 is ready for prime time: SVT-AV1 beats x265 and libvpx in quality, bitrate and speed
https://medium.com/@ewoutterhoeven/a...d-31c1960703db |
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