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5th September 2018, 22:32 | #882 | Link |
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I ask information to Google and they said that the AV1 note in the media update is an error.
They pulled AV1 support in M69 as there were late changes made to the MP4 specification. The spec has been finalized by AOM, so they have moved launch scheduling to M70. This pull request in MP4 specification repository suggests that will be finalized soon. Last edited by marcomsousa; 5th September 2018 at 22:42. |
8th September 2018, 07:08 | #884 | Link |
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The AV1 MP4 specification was finalized yesterday.
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10th September 2018, 02:20 | #885 | Link |
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Youtube has started to encode videos to AV1
https://www.youtube.com/watch?v=F1B9Fk_SgI0 You must have youtube-dl (2018-09-10) |
10th September 2018, 08:06 | #886 | Link |
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And you can download it like this
Code:
youtube-dl.exe -f 396 https://www.youtube.com/watch?v=F1B9Fk_SgI0
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10th September 2018, 08:22 | #887 | Link | |
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Quote:
1080p Interesting to compare this 3 formats AV1 - 33.37MiB Code:
youtube-dl.exe -f 399 https://www.youtube.com/watch?v=F1B9Fk_SgI0 Code:
youtube-dl.exe -f 248 https://www.youtube.com/watch?v=F1B9Fk_SgI0 Code:
youtube-dl.exe -f 137 https://www.youtube.com/watch?v=F1B9Fk_SgI0 Last edited by marcomsousa; 12th September 2018 at 10:13. |
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10th September 2018, 12:02 | #889 | Link | |
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Quote:
And it only goes up to 480p? |
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10th September 2018, 13:10 | #890 | Link |
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Higher resolutions are probably still encoding
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10th September 2018, 13:23 | #891 | Link | |
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Quote:
https://aomediacodec.github.io/av1-isobmff/#codecsparam av1, Main Profile (0), Level 3.1 (05), Main Tier (M), 8 bit (08)
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10th September 2018, 13:23 | #892 | Link | ||
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Quote:
Chrome/Firefox don't add any features that can be incompatible in the future. Quote:
It's beginning encoding videos with AV1 as a testing or to push the standard. It's too expensive encoding all videos at this moment, maybe it's better waiting 1 year (with custom capable encoding hardware). |
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10th September 2018, 20:36 | #893 | Link | |
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Quote:
So, is LAV holding back support until some sort of wider adoption of AV1 is accomplished? I didn't suggest that YT should start converting all videos. But converting all resolutions makes sense, for the few that are encoded. |
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11th September 2018, 07:33 | #896 | Link | |
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Quote:
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11th September 2018, 07:56 | #897 | Link |
I am maddo saientisto!
Join Date: Aug 2018
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Hi y'all!
So, since I keep finding more and more alignment-related bugs that only show up on GCC 8.2, but not on 7.3 (compiler's fault? aomedia's fault? Who knows <rant>they have barely gotten any attention despite the community's effort and the fact they involve common configurations and major compiler releases</rant>) I decided to just go for it and build a GCC 7.3 cross compilation VM Builds specs: GCC 7.3, 64bits only, statically linked, secure api enabled, so no Win XP support lbd binaries have been compiled with -DCONFIG_LOWBITDEPTH=1 hbd binaries have been compiled with -DCONFIG_LOWBITDEPTH=0 Use the former for all your 8bits needs since they are considerably faster, the latter for 10-12bits av1-1.0.0-541-g7d447f5b0: https://mega.nz/#!0wxmgCqS!vBuViCEA7...v1MubYI0lJnluI Last edited by SmilingWolf; 11th September 2018 at 09:40. |
11th September 2018, 11:08 | #899 | Link |
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@SmilingWolf: I'll keep an eye on it, as soon as MABS passes in both branches again. But for now, there is a greater evil breaking the building of ffmpeg. If the API for AV1 was ever "frozen", it seems to melt already.
And yes, I shared one of the issues of GCC 8.2.0 creating unaligned RAM access when vector optimization is enabled, several weeks ago, and apart from adding more CC's, not much happened about it. Last edited by LigH; 11th September 2018 at 11:12. |
11th September 2018, 11:46 | #900 | Link | ||
I am maddo saientisto!
Join Date: Aug 2018
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Quote:
Shouldn't take much more than removing lines 741-744 from libavcodec/libaomenc.c This one's on FFMPEG, and will probably be fixed in a day or so What bothers me much more is the same as the second part of your post, the inertia over months-long periods of time in the AOM tracker Quote:
Side note: unaligned memory access is fine AS LONG AS the ASM instructions emitted take into account memory could be unaligned. In this instance GCC 8.2 -O3 emits instructions that expect memory to be aligned to a 16-byte boundary (movdqa and movaps), while GCC 8.2 -O3 -fno-tree-slp-vectorize emits instructions fit for unaligned memory access (movdqu and movups) My advice is to stay on GCC 7.3 for AV1 for the time being. I found the laptop I was using back in june to build A/V stuff with an old toolchain, if you want I can zip it up and upload Last edited by SmilingWolf; 11th September 2018 at 11:59. |
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