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25th April 2023, 09:22 | #2521 | Link |
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I concur with Ben that high-quality adaptive bitrate (ABR) live streaming requires powerful hardware to attain high-quality compression. As codec standards and standards become increasingly complex, hardware encoders may find it difficult to keep up. Software-based streaming solutions that leverage the power of fast core processors will continue to be the preferred method for high-quality live streaming.
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13th June 2023, 14:15 | #2522 | Link |
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The AOMedia Research Workshop Europe 2023 will take place in a few days (June 19th), in Ghent, Belgium.
The conference program is in the image below, more details about each presentation can be found at the official website. The focus seems to be on AV2 and a retrospective of AV1 development and the technologies that were used in it. Last edited by Spyros; 14th June 2023 at 08:28. |
14th July 2023, 15:51 | #2523 | Link | |
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The progress in comparing AV1 with highly efficient encoding methods like H.264 Baseline VeryFast and x265 slow is impressive, especially considering the historical challenges in achieving high-quality live AV1 encoding. |
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17th July 2023, 22:07 | #2524 | Link |
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New uploads: (MSYS2; MinGW32 / MinGW64: GCC 13.1.0)
AOM v3.6.1-843-g93ca91b96 rav1e 0.6.1 p20230711-1-g2447fcc dav1d 1.2.1-43-g9278a14 SVT-AV1 v1.6.0-2-gba18204e avif 0.11.1-41ed914 dav1d [dec]:1.2.1-43-g9278a14, aom [enc/dec]:3.6.1-842-gff3c4c8a6, rav1e [enc]:0.6.1 (p20230711-1-g2447fcc) |
2nd August 2023, 15:20 | #2526 | Link |
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Just like VP9 ?
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2nd August 2023, 20:05 | #2528 | Link |
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It is historically relevant, as YouTube has been the primary user and driver of VP8, 9, and 10/AV1. VP8 and VP9 were really limited by the reference/sample encoder being highly tuned for YouTube scenarios and not well suited for for other use cases, like highly parallelized encoding of premium content. That caused some chicken/egg problems that prevented VP9 from getting encoders nearly as refined as those for H.264 and HEVC. I don't think VP9 as a bitstream could have outperformed HEVC in real-world applications, but VP9 encoders weren't able to capture as much of the potential of the bitstream as H.264 and HEVC encoders have, as the market for those commercial encoders is orders of magnitude higher.
For example, VP8/9 had very serialized decoding and limited on encoding. Which was fine for YouTube, which encodes in little slices of times on lots of different edge compute nodes as available. But premium content where time-to-publish is essential and encoding 3x more slowly to reduce bitrate by 10% is excellent ROI, it's a big limitation. And when secure DRM is a hard requirement and dropped frames cause cancelled subscriptions or purchase/rental refunds, having reliably fast decoders, preferably HW, are much more important. While user generated content gets a lot of eyeball hours, the economic value of improved quality and speed/efficiency tradeoffs are very different, and the $/hour invested are a tiny fraction of what premium content gets. AV1 has a much healthier ecosystem than any prior VPx version (going back to VP3 even), with more and better encoders available. So it's a compare and contrast. |
3rd August 2023, 22:28 | #2529 | Link |
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Hello! Today, I bring some exciting news about the AV2 codec developed by the AVM team. As many of you might be aware, AV2 is the successor to AV1 and aims to provide even better video compression and quality. In this post, I'll be discussing the recent advancements in AV2 and how it compares to its predecessor, AV1.
Active Development of AV2 Codec: The AVM team has been hard at work, continuously refining the AV2 codec to enhance its performance. Over the last couple of years, they have released several research tags to showcase their progress. In August 2021, the research2 tag was unveiled, followed by research3 in May 2022, and research4 in April 2023. Comparative Analysis on AOM AV2 CTC Streaming Classes: Recently, a comprehensive report was published that compared the performance of these three AV2 implementations on AOM AV2 CTC Streaming classes, namely A5, A4, A3, and A2, focusing on resolutions up to FullHD. The objective was to evaluate the quality metrics of PSNR (Peak Signal-to-Noise Ratio), VMAF (Video Multi-Method Assessment Fusion), and SSIM (Structural Similarity Index) for the different research releases. Steady Quality Improvements: The results of the study were nothing short of impressive. Across all quality metrics, there was a consistent improvement as the research progressed from version 2 to version 4. For example, the PSNR: Y (luma) with BD-Rate data aggregation showed a remarkable 8.76% improvement between research3 and research4. This demonstrates the commitment of the AVM team to refining their codec and pushing the boundaries of video compression technology. Spread and Variance: It's important to note that while the best and worst results also improved with each iteration, the spread and variance between different video streams increased. This suggests that the AV2 codec is becoming more specialized in handling certain types of video content optimally. Conclusions from the Study: Based on the findings of this study, some significant conclusions were drawn: On average, the AOM_post-AV1 (research 3 released in 2022 ) codec showed an 8.76% improvement over the AOM_post-AV1(research 2 released in 2021) reference codec across all video streams. Comparing the average performance on all video streams, the AOM_post-AV1 (research 4 - Apr23) codec outperformed the AOM_post-AV1 (research 3 - 2022) reference codec by an impressive 15.15%. In summary, the AV2 codec is showing immense promise and dedication from the AVM team. As the development progresses, it is evident that AV2 is significantly surpassing its predecessor, AV1, in terms of video quality and compression efficiency. However, with the increasing specialization, the codec might perform differently depending on the content being encoded. It's an exciting time for video compression enthusiasts, and we can't wait to see how AV2 evolves further. Feel free to share your thoughts and insights in the comments below! Let's discuss the future of video codecs together. Source: https://codecwar.com/compare/av2-research-evolution Last edited by CodecWar; 8th August 2023 at 07:31. Reason: clarifications |
4th August 2023, 22:30 | #2530 | Link |
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If all we are seeing on net is a 15.15% efficiency improvement, that is very overwhelming. A new codec needs a plausible path to around a 100% efficiency improvement (same quality, half the bitrate) to displace a prior one, or needs to add a substantial and compelling new feature (like broadcast-grade interlaced SD and HD video for MPEG-2, HDR for HEVC). 15% over AV1 is still a lot worse compared to VVC, which will have HW decoders shipping in products by end of 2023. It's also lower than the delta from VVC to current post-VVC test implementations from MPEG.
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6th August 2023, 13:39 | #2532 | Link | |
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8th August 2023, 20:11 | #2534 | Link | |
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Hence H.264, which was a pretty ground-up rethink of how to encode video that could deliver on 100% efficiency improvements. |
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8th August 2023, 20:15 | #2535 | Link | |
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I'm still surprised that the rate of improvement isn't higher, though. Lots of H.264 patents have expired, and thus don't have to be worked around, plus years more of academic research and work on the specific codec. I am guessing that the ML stuff isn't refined enough to deliver material benefits yet. That's probably the make or break for AV2. I find myself atypically unsure of how big a real-world difference that could make. We could well wind up still not knowing even at release, as there are SO many new ways an encoder can be tuned and can optimize a bitstream with ML as an option. Incorporating ML model overhead into rate control alone is a chewy interesting challenge. |
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29th August 2023, 10:00 | #2536 | Link |
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avif 1.0.0 has been released: https://github.com/AOMediaCodec/liba...ses/tag/v1.0.0
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29th August 2023, 17:26 | #2537 | Link | |||
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Improvement in percentage also doesn't make sense. It is BD-Rate ( Which the report actually suggest ). i.e Reduction. ( Which is why I assume benwaggoner was confused and mentioned 100% improvement as in efficiency as 50% BD-Rate ) Now if I remember correctly, R2 is something like 10% BD-Rate on AV1. So that is 15.5% on top of 10%, multiply to less than 25%. Which if I have to guess AV2 at R4 isn't even at VVC level. On the other hand, latest H.267 development is already at 30%+ on top of VVC. Did I mention AV2 was suppose to be out in ( *cough* ) 2020. So yes, I do think it is quite underwhelming. Previously Google was so fixated that next gen video codec being ML based and doesn't seems to offer any alternative. I wonder if R1- R4 is still ML based.
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30th August 2023, 16:25 | #2539 | Link | ||
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I'd hoped that the expiration of so many H.264 and other patents since AV1 would allow the use of tools AOM had wanted to use in AV1 but couldn't. It doesn't seem to have been the case. Perhaps the VPx core structure to avoid patents was so far off from the MPEG codec development process that tools weren't easily reusable? |
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2nd September 2023, 19:11 | #2540 | Link |
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libaom 3.7 is out: https://aomedia.googlesource.com/aom/+/refs/tags/v3.7.0
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