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21st April 2019, 15:04 | #1621 | Link | |
I am maddo saientisto!
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Quote:
When calculating the SROCC for only the "compression" distortions (JPEG and J2K) these are the results: Code:
--- top 33% PSNRHA 0.9686 DSSIM -0.9683 PSNRHVS 0.9677 PSNRHMA 0.9651 PSNRHVSM 0.9603 FSIMc 0.9589 FSIM 0.9580 VMAF_rb_v0.6.3 0.9524 SSIMULACRA -0.9519 VMAF_v0.6.1 0.9505 WSNR 0.9468 --- middle MSSIM 0.9427 VIFP 0.9380 --- low 33% PSNRc 0.9200 CQM 0.9190 PSNR 0.9170 VSNR 0.9162 SSIM 0.9147 NQM 0.9023 |
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24th April 2019, 17:41 | #1622 | Link |
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dav1d decoder v0.3.0 is out:
Changes for 0.3.0 'Sailfish': ------------------------------ This is the final release for the numerous speed improvements of 0.3.0-rc. It mostly: - Fixes an annoying crash on SSSE3 that happened in the itx functions |
24th April 2019, 19:14 | #1623 | Link |
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Just because someone updates the changelog doesn't mean it has been released already. You can see actual release tags here, hopefully to help avoid confusing premature announcements:
https://code.videolan.org/videolan/dav1d/tags There is no 0.3.0 yet. There will need to be one or two additional maintenance changes before that is the case. Probably in a day or two.
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LAV Filters - open source ffmpeg based media splitter and decoders Last edited by nevcairiel; 24th April 2019 at 19:16. |
25th April 2019, 12:35 | #1625 | Link | |
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Interesting snippet here:
https://www.streamingmedia.com/Artic...ng-131160.aspx Quote:
Basically claims the AV1-SVT encoder has barely begun development. If that's the case should be interesting to follow it's progress. I noticed a ticket on their tracker where people were asking them to tag a pre-release so they could begin the process of integrating with Austria etc and the Devs didn't think it was ready for even a pre-release status, then a press release came out announcing version 1.0 was ready. Last edited by dapperdan; 25th April 2019 at 21:54. |
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25th April 2019, 15:51 | #1627 | Link |
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Really nice writeup of adding tiles to rav1e - explains what tiles are nicely:
https://blog.rom1v.com/2019/04/imple...ding-in-rav1e/ (credit: reddit av1 channel https://www.reddit.com/r/AV1/) |
25th April 2019, 16:16 | #1628 | Link | |
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Quote:
[edit] removed some nonsense because I misread your reply, sorry about that. Last edited by Beelzebubu; 25th April 2019 at 16:19. |
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25th April 2019, 19:12 | #1629 | Link | |
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26th April 2019, 00:11 | #1631 | Link |
Derek Prestegard IRL
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Good interview. I spoke with Oliver from NGCodec at NAB this year and I agree with a lot that was said.
FPGA is neat and disruptive because it's cloud native now, so you can get a lot of the flexibility of a pure software solution. I think there's a span of a few years where FPGAs make a lot of sense for dense live encoding, but then eventually ASIC encoders get even better / faster / more power efficient, and software encoders continue to offer better quality. I think offline encoding for VOD streaming will still be done in software no matter what. I thought maybe there'd be a use case for FPGA AV1 encoding in the next year or so while software encoders (and CPUs) get fast enough to make AV1 encoding practical, but Oliver didn't seem to think this was a great use case. In retrospect, I'm inclined to agree. |
27th April 2019, 21:09 | #1632 | Link | |
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Quote:
It's very difficult for a sporadic doom9 reader like myself to follow with what has been discussed in this thread... |
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3rd May 2019, 08:50 | #1633 | Link |
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dav1d 0.3.0 decodes AV1 video’s 24% faster on SSSE3, 26% on SSE4.1 and 4% on AVX2 (all PC), and 12% faster on Arm64 (mobile).
https://medium.com/@ewoutterhoeven/d...h-af5bbf845a16 |
6th May 2019, 15:10 | #1634 | Link |
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https://www.singhkays.com/blog/its-t...ith-av1-video/
I did a quick comparison of AV1 vs x264 vs VP9 at ultra low bitrates and how it can be used to replace GIFs in the browser |
6th May 2019, 17:47 | #1635 | Link | |
VP Eng, Kaleidescape
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Quote:
The claimed 50% bit rate reduction of VP9 vs. AVC is not substantiated by independent studies, or in practice by anyone. Also, you can't add bit rate reductions, you have to multiply bit rate ratios. If B encodes to the same quality as A at 0.5x the bit rate, and C encodes to the same quality as B with 0.7x the bit rate, C theoretically is 0.7 x 0.5 = 0.35x the bit rate of A... a 65% reduction, not 80%. But in practice studies have shown that AV1 is roughly on par with HEVC when measured with objective metrics (PSNR, SSIM, VMAF, etc.), delivering roughly a 50% bit rate reduction over AVC. However, measured subjectively it's behind HEVC. Although all of the above measures video, and not still still image compression, I expect the results for image (I frame only) compression to be quite close. Mozilla published a study in 2013 which confirmed the superiority of HEVC still image compression over other existing formats. Strangely, the link to the study no longer works, but I saved a copy. Maybe one of the Mozilla guys can reshare it. I agree that content publishers and web sites should be leveraging more powerful video codecs for still image compression. They can start with AVC, as device support is ubiquitous, and it is an improvement over JPEG and GIF. If/when they add support for an advanced codec, they will want the largest range of devices to support that codec, and they will want hardware decoding (for speed and vastly reduced power consumption). They can leverage HEVC (in HEIC container files... based on the ISO Base Media File Format, the evolution of .mov and .mp4) for the majority of devices which already have hardware HEVC support. See https://nokiatech.github.io/heif/comparison.html Google developed the WebP standard for still image compression, based on VP8 technology. It's only 10% more efficient than JPEG. What you're proposing would seem to be a new version of WebP. |
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6th May 2019, 22:27 | #1636 | Link | |
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7th May 2019, 16:28 | #1637 | Link |
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Possible partial GPU acceleration coming in Dav1d during this years GSoC.
I wonder how much latency is incurred for only partial GPU decode, some guy going by atomnuker discussed possible GPU AV1 at FOSSDEM last year I think. |
7th May 2019, 17:45 | #1638 | Link | |
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Win 10 x64 (19042.572) - Core i5-2400 - Radeon RX 470 (20.10.1) HEVC decoding benchmarks H.264 DXVA Benchmarks for all |
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7th May 2019, 18:19 | #1639 | Link |
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Don't get too excited quite yet, such efforts have in the past been problematic to get truely faster. We'll have to see.
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LAV Filters - open source ffmpeg based media splitter and decoders |
7th May 2019, 19:57 | #1640 | Link |
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I'd be less interested in faster playback using GPU in favor of lower power for phones prior to decoder ASIC rollouts, which probably wont be until at least next year.
I think Rockchip's recently announced RK3588 SoC for 2020 has an AV1 decoder, but details were sparse in the announcement. The thing which concerns me most is the lack of any announcement from Qualcomm in support of AV1, considering their huge market share in Android devices |
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