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13th January 2021, 09:03 | #2361 | Link | |
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I'm not sure if Chrome has an equivalent easily found switch to control AV1 playback capability. |
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13th January 2021, 09:40 | #2362 | Link | |
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When I wrote ">10 bpc" I only meant above 10 bpc, not 10 bpc and above. Some people write > to mean 'more than or equal to', for me it just means 'more than', and >= means 'more than or equal to'. Linguistic consequence of Python dabbling I think. As to the difference between 2K and 4K being visible without HDR, I would say that depends upon display size and the viewing distance. IMHO many people get screens too small to even appreciate the resolution uptick from SD to 1080p, and often sit too far away from the screen which only makes the issue worse. I have a 40 inch 1080p TV which I use as a PC monitor (50 cm away at most), and I can just about see the screen door effect of the pixel separation. Obviously this gets much worse for a 4K screen, and 8K is never going to be anything but a placebo to the consumer, unless viewing through VR with insane pixel res per eye and the right optics to capitalise on it. |
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14th January 2021, 13:52 | #2363 | Link |
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rav1e v0.4.0 is out: https://github.com/xiph/rav1e/releases/tag/v0.4.0
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14th January 2021, 18:55 | #2364 | Link | |||||
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14th January 2021, 21:14 | #2365 | Link |
Derek Prestegard IRL
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Another aspect of VR is that when it comes to pre-produced content you're effectively rendering a 360 degree scene and then using equirectangular projection to fit that into a standard video frame size. During playback the player wraps that video inside a sphere and drops your viewport inside of that sphere. This means that you actually look at a small piece of the video. With a ~4K video and a ~2.5K head mounted display / headset with a typical FOV you're going to be looking at maybe 1/4 of the encoded resolution. The player of course has to upscale to hit the native HMD display. All of this means that you're basically watching sub HD video on a very dense screen as close as your eyes can focus
360 video is generally pretty boring, but to really maximize the potential you'd basically want a 16k video. Some companies (Pixvana) tried to get around this by cutting the video into slices and only streaming one or two at a time. This theoretically lets you get higher resolution during playback and lower bandwidth (since you're not streaming / decoding / processing everything you can't see). Ultimately 360 video just does not scale though, and the lack of parallax is disturbing and uncomfortable for many. Here's hoping for lots of neat developments in light field capture, compression, and delivery. The guys at Lytro were doing wild and crazy stuff a few years ago before they ran out of money. I wonder what Google is doing with all that IP... |
15th January 2021, 19:24 | #2366 | Link |
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Yeah, I've got ~7 patents on VR encoding and playback, and it's not something I see a way to make work for customers for scripted content. Video games are obviously a good fit for some genres, and some experiences more like museum curation can be great. But VR is mainly a new thing, not a new way to deliver old things.
And video quality is at least 15 years behind what we can do with a 2D flat screen. |
17th January 2021, 14:57 | #2367 | Link |
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Google to require all new android tv device model released after march 31st 2021 must include AV1 decode support: https://www.xda-developers.com/googl...ideo-decoding/
We will therefore see all new android tv box models having support and also some tv's also use android tv so they will support av1 too. |
18th January 2021, 10:06 | #2368 | Link | |
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His impression was that it was potentially amazing (especially for potentially rendering green screen filming redundant), but that the processing and storage hardware was reminiscent of the early days of computers size wise, and not at all practical for production film use at that time (this was maybe early 2018). Google may well be simply concentrating on downsizing the technologies problems at the moment. Decreasing compute and storage demands to a reasonable level would go a long way towards making it viable for wider use, even if just for the VFX industry to begin with. OTOH if Lytro's patents are broad enough they may just be sitting back and waiting for a gold mine to mature when some other company does all that R&D heavy lifting for them. As someone who had to monkey about with messy green screen footage in NUKE I'm definitely excited by the possibilities in lightfield capture - though I would probably settle for just high res depth map data captured for each frame of video. |
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19th January 2021, 18:11 | #2369 | Link | |
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The stuff was really complex on-set. It made early 3-strip Technicolor look simple. And while some components could be shrunk down, fundamentally you need a lot of lenses over a pretty wide area for the tech to work. |
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19th January 2021, 21:44 | #2370 | Link | |
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They not only increase the versatility of lenses (much lighter, thinner, and even achromatic focusing in a single lens element) but make them much easier to manufacture en masse. Making a metalens is more like manufacturing a computer chip with photolithography processes, rather than the cutting and polishing of conventional curved lenses used today. It makes sense to make a big change all at once for lightfield capture considering LF itself is a big change from conventional camera technology - might as well make a clean break. |
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17th February 2021, 12:57 | #2376 | Link |
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New uploads: (MSYS2; MinGW32 / MinGW64: GCC 10.2.0)
AOM v2.0.1-1254-gdb9ae9d7a rav1e 0.5.0-alpha (1869a8b2 / 2021-02-15) dav1d 0.8.1-70 (gb768fdb / 2021-02-15) avif 0.8.4-ac14571 dav1d [dec]:0.8.1-61-g2e73051, aom [enc/dec]:2.0.1-1224-g89fc93496, rav1e [enc]:0.4.0 (p20210202-11-gbc17f485) |
22nd February 2021, 12:56 | #2377 | Link |
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dav1d 0.8.2 'Eurasian hobby' the fast and lean AV1 decoder
This is a middle-size update of the dav1d decoder, from the 0.8.x branch.This release adds most of the remaining NEON optimizations for ARM, especially for 10/12bit bitdepth, in both ARM32 and ARM64.This release also split the post-filters into their own threads. This release speeds up quite a bit the desktop version, notably in the coefficient decoding and the MSAC parts. It also introduces the first 10bit optimizations for x86. Finally, this release improves the speed in numerous parts of the decoder, improves the player shipped and brings other fixes. Marco Sousa Last edited by marcomsousa; 22nd February 2021 at 22:18. |
19th March 2021, 03:03 | #2379 | Link |
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NETINT Announces the World’s First Commercially Available Hardware AV1 Encoder for the Data Center
https://netint.ca/netint-announces-t...e-data-center/ |
19th March 2021, 06:00 | #2380 | Link | |
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In general, the more complex the codec, the bigger advantage SW encoders have had in quality over HW. AV1 is the most complex video codec, ever. It's hard for me to imagine how an ASIC could deliver competitive quality. But maybe they've found magic! I look forward to seeing its output. |
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