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13th April 2020, 20:21 | #201 | Link | |
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13th April 2020, 23:44 | #202 | Link | |
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To the extent they get SIMD and other speedups, it's really just to make testing iterations fast enough to be practical to do during development. |
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14th April 2020, 06:22 | #203 | Link |
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Here is a recent paper [1] comparing VVC and HEVC along with AV1. Although it is using an ancient VTM 4.0. For the bitrate I care about ( which is sub 4Mbps ) it seems to be doing well at anywhere between -30 -40% in terms of PSNR and VMAF. These are reference encoder anyway so I think the stats are good enough for now.
They are using AOM AV1 0.1.0-9647-ga6fa0877f, I am not familiar with libaom build number? But 1.0 was released a long time ago, does anyone know what version does this represent? Edit: The same presentation with updated results [2], the libaom used was basically initial AOM 1.0 release in 2018, the presentation included updated results with encoder from late 2019. [1] https://arxiv.org/pdf/2003.10282.pdf [2] https://aomedia.org/wp-content/uploa...niversity.pptx Last edited by ksec; 14th April 2020 at 06:29. |
14th April 2020, 20:55 | #204 | Link | |
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We've seen cases where even a 20% "advantage" in objective metric bd-curves can still wind up as a lower subjective ranking. Bear in mind that VMAF is just machine learning trying to estimate subjective quality ratings based on some basic objective rankings per frame. But it was only trained on what it's been trained on. Since no one has ranked VVC versus AV1 artifacts in the training set, VMAF simply hasn't been exposed to those, and I am skeptical of its scores for novel codecs until there is an updated model trained on examples of the codecs in question. We've seen VMAF provide lower scores when adaptive quantization is used in H.264 or HEVC even when subjective ratings improved. VMAF is still the least-bad objective metric we've had, and much more useful than PSNR. And it's gotten successively better as new models have come out (which is why talking about "VMAF" without specifying a version number is dangerous, as the same video will have a different VMAF score with today's model than with older ones). But it's far from reliable for novel codecs or psychovisual algorithms. |
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14th April 2020, 21:16 | #205 | Link | |
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I note some limitations that make extrapolation to real-world implementations quite limited.
But in the real world, differences between encoders are bigger than between codecs. Recall x264 beat libaom for a lot of real-world scenarios early on, and x265 can beat libaom for a lot right now, especially when encoding time is constrained. This is at least as much about the maturity of the encoder implementation than fundamental advantages/disadvantages of the bitstream syntax and features. |
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25th April 2020, 09:19 | #206 | Link |
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vvc vtm v8.1 out: https://vcgit.hhi.fraunhofer.de/jvet...leases/VTM-8.1
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25th April 2020, 11:22 | #207 | Link |
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https://nofilmschool.com/three-new-codecs-are-coming I'm afraid this will be the last version this year. There is currently no interest in developing on the European market. |
25th April 2020, 12:46 | #208 | Link | |
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25th April 2020, 13:12 | #209 | Link |
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If you analyze the VVC library, you can see how much the addition of new functions or major corrections has decreased. Now these are minor corrections for a month. This has good sides, but the project has stopped. There are hardly any European creators although the project is German. It also amazes me. Disinterest? Why do I complain? This project isn't for hobbyist only for TV corporation and I have the impression after the advertisement that it is far from being implemented.
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25th April 2020, 13:32 | #210 | Link | |
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25th April 2020, 16:55 | #212 | Link |
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Most users of VVC will indeed be using hardware decoders, which is the same as AV1. Youtube doesn't stream in AV1 by default, you need to enable it in your settings. Phone apps don't use it by default either except for netflix at low resolutions.
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25th April 2020, 19:20 | #213 | Link |
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There were lots of draft update in between Jan and March. So it is in the very final stage of the standard. VVC was suppose to be ratified by July, with first official release of the standard in Oct 2020. Judging from the way things are handled it doesn't seems COVID will cause any delay to the standard.
MC-IF on the other hand looks a little uncertain. |
26th April 2020, 23:25 | #214 | Link | |
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I have default settings and Youtube frequently streams in AV1 https://www.youtube.com/testtube |
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27th April 2020, 23:38 | #215 | Link | |
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I don't know why VVC wouldn't be any less hobbyist-friendly than other MPEG codecs, although, since the patent licensing issues don't really apply to home use. There are certainly a huge number of tools that allow for deep experimentation and tweaking like we saw in x264's development for H.264. |
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27th April 2020, 23:58 | #216 | Link |
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I'd say AV1 is somewhat unique as it has a much stronger emphasis in use on web browers given Google and Mozilla are big supporters. We still don't have announced GPUs with AV1 for Win/Mac or high volume SoCs for mobile. The only HW decoders I know of are in a few high end TVs, as Google requires AV1 for 8K streaming.
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28th April 2020, 06:04 | #217 | Link |
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For maniacs: jvetvvc v8.2 + little fixes
https://www.sendspace.com/file/g3uurw https://www.multichannel.com/pr-feed...d-supports-vvc https://www.allegrodvt.com/video-ip-...-vvc-standard/ https://arxiv.org/abs/2003.10282 https://www.ibc.org/manage/2020-crun...s/5569.article Since VVC will require hardware implementations it will likely take at least a couple of years for initial adoption. It is also hard at this stage to predict the cost of the licence for VVC but everyone is keen to avoid a repeat of what happened with HEVC. Last edited by Jamaika; 28th April 2020 at 06:26. |
28th April 2020, 19:01 | #218 | Link |
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I don't know that it'll still be 2+ years. VVC is getting lots of input from SoC and other HW companies to make decoder implementation more performant and parallelizable than AV1 was. We had HEVC HW encoders in the wild in 2014, within a year of HEVC's final standard being approved.
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29th April 2020, 13:15 | #219 | Link | |
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I don't think either codec will spread as quickly as the previous ones |
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30th April 2020, 04:14 | #220 | Link | |
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Anyway, back to 8K. There has always been a lot of confusion about how things were going to be but we couldn't rest cause Tokyo Olympics were getting closer and Japanese were 100% sure that they were going to shoot and air it in 8K thus providing an 8K feed to broadcasters who bought the rights. So we tried to do what we could with what we had available. The plan: Sony UHC-8300 cameras, different video servers and two teams. The reason for these cameras is that they provide simultaneous 8K/4K/FULL HD streams in HDR and SDR and you can choose between S-Log3, HLG and the plain old linear BT709. There's been quite a debate about doing simultaneous streams as I didn't quite agree. My suggestion was to get a single 8K HDR stream out of octal 12G-SDI in HLG and then downscale and frame convert it live to 4K and also downscale, frame convert and divide in fields (interlace) it live to FULL HD and apply a linear transformation with a LUT made ad hoc. They didn't like it, they said that I shouldn't bring back old arguments and that we've been over this again, so the plan they wanted to go for was to have different outputs from the camera and then two different teams working on the HDR HLG 4K/8K stream and the other working on the SDR FULL HD one like we do now for 4K/FHD events 'cause the idea is to get as much as possible from both technologies and NOT to penalize SDR viewers only because of HDR workflows since (believe it or not) they still make a big fat chunk of our viewers. Now comes the funny part: how are we going to encode it? H.266 is still at a very early stage and it's really not practical to use it (heck, the standard isn't defined yet and there are no hardware encoders for it), so what do we do? Go with H.265? Well that's... Impossible... Although H.265 is the best thing we have, you gotta keep in mind that a master 8K stream is over 48 Gbit/s and if you wanna encode it live you gotta do it fast so you don't have much complexity anyway unless you wanna add a huge delay to your customers (and many live encoders are between 1 and 4 seconds but even if you set it to the maximum, they don't let you choose anything higher than 20 seconds which is a huge amount of time). So, even with H.265 set for live encoding at its best but with a reasonable delay we couldn't really get anything good out of it lower than 70 Mbit/s and if we push the delay really up we can squeeze it to around 50 Mbit/s but that's it, really, so the question is: how the hell are we going to air it?! Sadly everything stopped because of COVID-19 now but this is to give you an overview on how things were going before this disease... Honestly, I have no idea about what Japanese wanted to do with the Olympics, but still... I also heard that BTSport guys were ready to offer the Champion's League final in 8K HDR10+ PQ H.265 50fps but via internet only and not on their linear channels, which is reasonable considering that with internet you can overcome pretty much everything as long as you're willing to pay for the CDN bandwidth. Now everything is frozen and we're in this limbo waiting for things to go back to normal: Olympics have been postponed for a year and we don't even know if there will be a Champion's League final this year as it becomes less and less likely as day passes... This is all to say: we're not ready, but I'd very much like to see H.266 begin to be implemented in real hardware encoders and TV decoders... Last edited by FranceBB; 30th April 2020 at 04:27. |
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