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Old 22nd January 2020, 19:32   #2081  |  Link
paul97
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https://www.reddit.com/r/AV1/comment...est_av1_build/
I asked the question on Reddit some months ago. Here it is.
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Old 22nd January 2020, 19:38   #2082  |  Link
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https://www.reddit.com/r/AV1/comment...est_av1_build/
I asked the question on Reddit some months ago. Here it is.
Thanks for the reply.

I'm starting the encoding process now.

Thanks again.
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Old 22nd January 2020, 21:39   #2083  |  Link
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You're welcome.
Rav1e has still 80% 120% 340% difference in quality/bitrate in videos on arewecompressed.yet AWCY. A site that codec developers use to test. SVT is too far from libaom as encoder if you see Mrsmilingwolf's user test on Reddit or on Doom9 like comparable to VP9 a bit not better. I don't know if he tests with anime or like action.

Also FFmpeg has included a build of encoders (Libaom) which you check the readme file in the archive (.zip) or in lower section "Other Downloads" by clicking Readme to see which version it is. Handbrake GUI doesn't support the encoding because it's too slow and AV1 support it's only in beta.
But it supports dav1d (Videolan) decoding, only 8bit is completed on general SIMD, 10 bit lacks support, so it runs without SIMD instructions.
If you use a GUI like Hybrid other than ffmpeg, to encode with libaom you will need aomenc.exe.
Artificial noise isn't possible with a GUI, you need ffmpeg and use libaom.

Last edited by paul97; 22nd January 2020 at 21:53.
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Old 23rd January 2020, 00:47   #2084  |  Link
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You're welcome.
Rav1e has still 80% 120% 340% difference in quality/bitrate in videos on arewecompressed.yet AWCY. A site that codec developers use to test.
What do those percentages mean specifically?

Quote:
SVT is too far from libaom as encoder if you see Mrsmilingwolf's user test on Reddit or on Doom9 like comparable to VP9 a bit not better. I don't know if he tests with anime or like action.
Given the configurability of SVT-AV1 in terms of quality/perf and tuning, it's hard to know what to make of encoder versus encoder comparisons. There are literally dozens of values that could impact quality. It would be more useful to compare quality at known best parameters, or quality at same bitrate and encoding time on a given system config.

It seems that there should be scenarios and highly multicore systems where SVT-AV1 would beat libaom in quality @ bitrate @ perf, just because it would have so many more MIPS/pixel available.
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Old 31st January 2020, 04:15   #2085  |  Link
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Thank you so much for the reply.



How do I check that I get the latest AV1 encoder?



Thank you in advance.
https://www.singhkays.com/blog/docke...ffmpeg-libaom/

I compile a docker image with the latest libaom source + ffmpeg every weekend
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Old 5th February 2020, 21:10   #2086  |  Link
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Optimisation for dav1d happening for 16 bpc on ARM64 apparently - whether that means everything between 16 and 8 I don't know.

Apparently Netflix are pushing out AV1 now too (possibly even sponsoring the new optimisation efforts?).

Are we finally at the point where AV1 deserves its own sub forum?
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Old 6th February 2020, 00:07   #2087  |  Link
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https://netflixtechblog.com/netflix-...d-d5264a515202
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Old 6th February 2020, 01:08   #2088  |  Link
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Optimisation for dav1d happening for 16 bpc on ARM64 apparently - whether that means everything between 16 and 8 I don't know.
Apparently it means code written for both 10 and 12 bit at the same time, but since they don't fit into 8 bit, they jump to 16.
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Old 6th February 2020, 05:02   #2089  |  Link
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Is YouTube starting to roll out AV1 for less popular videos and/or YouTubers?

I noticed AV1 encodes on the following video with less than 100k views that's only 5 days old: https://www.youtube.com/watch?v=g6NvMpzRoyU


Also I always found it a bit odd that YouTube used MP4 rather than WebM for AV1. I realize MKV and therefore WebM support was not available when YouTube started introducing AV1, but considering they themselves created WebM (albeit not from scratch as it's a derivative of MKV), and they previously chose to use WebM rather than MP4 for VP9 tells me that they would prefer WebM when given the choice...

(personally I greatly prefer the WebM and by extension MKV container vs MP4 when it comes to streaming assuming the codec used is the same, but I realize that for 99.9999% of people WebM/MKV vs MP4 container would make absolutely no impact on how they consume video)
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Old 6th February 2020, 06:38   #2090  |  Link
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Probably wider support for fMP4 on various platforms. What benefits does WebM offer over fMP4 for ABR streaming via DASH?
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Old 6th February 2020, 10:06   #2091  |  Link
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What benefits does WebM offer over fMP4 for ABR streaming via DASH?
So the following is a super niche use-case... (this is even why I specifically said "99.9999%" to 4 decimal places rather than the more typical "99.9%" or "99.99%", because I'm fully aware just how super niche this use-case is).


I notice that opening an incomplete DASH MP4 stream in MPC-HC or mpv that is downloading via youtube-dl will have the video stream eventually stop at whatever point the video had downloaded when you launched the file even if the download is finished (thereby requiring you to relaunch the video).

With YouTube's DASH WebM encodes though, if you open an incomplete but still downloading DASH WebM video in MPC-HC or mpv, it's able to completely play through the video without issue as long as it's downloading quicker than you're viewing it.


It is worth noting however that sometimes I notice that a rare DASH WebM video will instead be downloaded into individual chunks via youtube-dl which are then reassembled into a single file as it downloads. These are notable in that trying to watch the reassembled albeit still downloading video gives you the exact same behavior as the DASH MP4 videos.
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Last edited by Nintendo Maniac 64; 6th February 2020 at 10:08.
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Old 6th February 2020, 10:06   #2092  |  Link
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Originally Posted by Nintendo Maniac 64 View Post
Is YouTube starting to roll out AV1 for less popular videos and/or YouTubers?

I noticed AV1 encodes on the following video with less than 100k views that's only 5 days old: https://www.youtube.com/watch?v=g6NvMpzRoyU
720p only. 1080p is still distributed using VP9.

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This announcement makes no sense: I don't know a single mobile SoC which supports AV1 HW decoding acceleration right now which means the poor users who will watch AV1 content will decimate their battery life.
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Old 6th February 2020, 10:09   #2093  |  Link
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720p only. 1080p is still distributed using VP9.
1080p AV01 (fmt 399) is listed in youtube-dl though and does indeed successfully download.


Quote:
Originally Posted by birdie View Post
I don't know a single mobile SoC which supports AV1 HW decoding acceleration right now which means the poor users who will watch AV1 content will decimate their battery life.
I would imagine they're probably only using it for SD, likely with a focus on markets where bandwidth speed and the like is quite low (think maybe less than 1mbps?)
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Old 6th February 2020, 10:12   #2094  |  Link
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1080p AV01 (fmt 399) is listed in youtube-dl though and does indeed successfully download.
Yet both Google Chrome and Mozilla Firefox defaulted to VP9 when I switched to 1080p.
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Old 6th February 2020, 10:15   #2095  |  Link
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Yet both Google Chrome and Mozilla Firefox defaulted to VP9 when I switched to 1080p.
Perhaps YouTube is "holding back" on playing more than 720p AV1 in browsers because they know that no hardware decode support is available on PCs?

They did something similar back when they were rolling out VP9 whereby it would fallback to AVC if your user agent listed Windows XP (one of the few cases of user agent sniffing that I feel is not actually terrible)



Also here's a youtube-dl screenshot for reference showing the 1080p AV1:

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Old 6th February 2020, 10:44   #2096  |  Link
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Yet both Google Chrome and Mozilla Firefox defaulted to VP9 when I switched to 1080p.
I get 1080p AV1 in Firefox on Windows
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Old 6th February 2020, 11:17   #2097  |  Link
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I get 1080p AV1 in Firefox on Windows
Are you sure about that?

Firefox 72, UA: Windows 10 64: https://i.imgur.com/nkZRiUZ.png

Last edited by birdie; 6th February 2020 at 11:19.
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Old 6th February 2020, 11:42   #2098  |  Link
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Am I sure?
https://imgur.com/WG8icgu

Jokes aside that's probably a setting somewhere on the YouTube account, I kind of remember something like that.

Last edited by Are_; 6th February 2020 at 11:45.
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Old 6th February 2020, 11:52   #2099  |  Link
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Am I sure?
https://imgur.com/WG8icgu

Jokes aside that's probably a setting somewhere on the YouTube account, I kind of remember something like that.
Yeah, and I didn't touch it, so in terms of defaults YouTube does not yet offer AV1 for 1080p videos.
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Old 7th February 2020, 09:02   #2100  |  Link
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This announcement makes no sense: I don't know a single mobile SoC which supports AV1 HW decoding acceleration right now which means the poor users who will watch AV1 content will decimate their battery life.
They note that they're using Dav1d and supporting development of 10-bit assembly speedups so that's what wil be used until hardware arrives.

Currently it's opt in, you need to flick the pre-existing switch that says you want to save data when watching on mobile. I assume most of the time this just reduced file size and therefore quality, but now they have the extra option of switching codec as well.

It would be nice if they'd run the numbers and publish them, but against the backdrop of mobile streaming and a phone screen fully on, I'm not sure the lack of hardware decode will be that noticeable. I think Instagram were already shipping a VP9 software decoder on Android I don't think they were even using the fast ffmpeg decoder, just libaom.
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