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Old 13th November 2017, 18:47   #341  |  Link
cheerow
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I just did some test encodes with the recent git version. All the now default enabled features (experiments) have massively increased the VMAF score compared to a few months ago. Just judging by VMAF, as flawed as it may be, AV1 is now way above x265.

Also tried some options to speed up encodes. Seems like --cpu-used has very limited effect. Encoder always ran on just one cpu until I supplied --tile-columns=X but that is bugged, only the leftmost columns comes out correctly, the others are basically broken. And even then it doesn't saturate any cpu completely.
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Old 13th November 2017, 21:57   #342  |  Link
mzso
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Also tried some options to speed up encodes. Seems like --cpu-used has very limited effect. Encoder always ran on just one cpu until I supplied --tile-columns=X but that is bugged, only the leftmost columns comes out correctly, the others are basically broken. And even then it doesn't saturate any cpu completely.
Well, vpx also has crappy multi-processing which never saturates my cpu, so not really surprising.
Hopefully eventually it'll get decent multi-processing like x264.
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Old 13th November 2017, 22:01   #343  |  Link
Blue_MiSfit
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I wouldn't hold your breath. The main use case for AV1 and VP9 is cloud scale distributed encoding which can very happily be single threaded because inputs are broken into small chunks and encoded in parallel across many many many small cloud VMs. Given the availability of a system to do this, it's a much better solution than trying to do per-encode-instance multithreading because it's way simpler and has zero downsides.

Multi-threading is more important for live, and for desktop encoding.
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Old 13th November 2017, 22:19   #344  |  Link
LigH
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The more complex an algorithm, the more probable are dependencies between intermediate results, the less probable is optimal parallelizability...
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Old 18th November 2017, 10:22   #345  |  Link
bstrobl
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IETF 100: https://www.youtube.com/watch?v=_wRLR8ypCg0
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Old 20th November 2017, 18:11   #346  |  Link
wiak
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Well, vpx also has crappy multi-processing which never saturates my cpu, so not really surprising.
Hopefully eventually it'll get decent multi-processing like x264.
there is hope now that vp9 has row-mt

and on a related note streaming media C104 video with alot of AV1/HEVC talk
http://streamingmedia.brightcovegall...rt=true&page=1
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Old 21st November 2017, 18:44   #347  |  Link
Clare
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http://demo.bitmovin.com/public/firefox/av1/
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Old 21st November 2017, 19:50   #348  |  Link
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MPEG-DASH Adaptive Streaming with AV1 by Mozilla and Bitmovin

Content encoded in AV1 by Bitmovin Encoding and played back with Bitmovin Player (7.3.0-b7) in Firefox (**.*)
Seems to require a nightly Firefox to be installed.
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Last edited by LigH; 21st November 2017 at 19:54.
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Old 21st November 2017, 19:57   #349  |  Link
mzso
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To me video hangs every few seconds for several seconds in FF Nightly. Any better way to view it?

Can I download it somehow? It might be that something glitchy with networking.

Last edited by mzso; 21st November 2017 at 20:05.
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Old 21st November 2017, 20:00   #350  |  Link
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Possibly if you somehow manage to record the MPEG DASH video stream locally and play it afterwards; but that's the opposite of the intended use: Video streaming. Who knows whether the streaming or the player is the bottleneck here (but it is hosted on Akamai network servers...).
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Old 21st November 2017, 20:21   #351  |  Link
mzso
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Possibly if you somehow manage to record the MPEG DASH video stream locally and play it afterwards; but that's the opposite of the intended use: Video streaming. Who knows whether the streaming or the player is the bottleneck here (but it is hosted on Akamai network servers...).
I can't know, that's why I wanted to download the video file. To exclude networking issues.
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Old 21st November 2017, 20:22   #352  |  Link
IgorC
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1080p streams have the issue. 720p and below play all fine.

Quality is less than impressive (even for highest bitrate, 1080p@3 Mbps). A lot of blur.
Probably lately AV1 will be tuned visually.
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Old 22nd November 2017, 17:07   #353  |  Link
wiak
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To me video hangs every few seconds for several seconds in FF Nightly. Any better way to view it?

Can I download it somehow? It might be that something glitchy with networking.
well thats one of the long time quirks of that decoder, i suspect they use the same decoder firefox used in a another older demo, what hw do u got?
i suspect its very single core depenant on decoding just like the current encoder

wait for the bitstream to freeze to check it out, thats when all the encoders and decoders align to decode the same file, atm the decoder cant decode another version of the encoder
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Last edited by wiak; 22nd November 2017 at 17:19.
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Old 22nd November 2017, 17:41   #354  |  Link
mzso
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well thats one of the long time quirks of that decoder, i suspect they use the same decoder firefox used in a another older demo, what hw do u got?
i suspect its very single core depenant on decoding just like the current encoder

wait for the bitstream to freeze to check it out, thats when all the encoders and decoders align to decode the same file, atm the decoder cant decode another version of the encoder
I have a Ryzen 1600 right now.
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Old 22nd November 2017, 18:39   #355  |  Link
wiak
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I have a Ryzen 1600 right now.
hello there, your zenpai here! i got a 1700X
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Last edited by wiak; 22nd November 2017 at 18:43.
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Old 25th November 2017, 17:45   #356  |  Link
Clare
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hello there, your zenpai here! i got a 1700X
I'm looking to buy one too (or maybe wat for the Zen+ in February), what kind of fps do you get for AV1 or x265?
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Old 27th November 2017, 17:36   #357  |  Link
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Streaming Tech Sweden AV1/HEVC comparison by Jan Ozer: https://www.youtube.com/watch?v=KzqOIddTNPQ

Hopefully the AV1 update by Jai Krishna will be uploaded soon. For those who are impatient, the slides are here: https://speakerdeck.com/stswe/av1-up...an-from-google
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Old 27th November 2017, 22:37   #358  |  Link
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Streaming Tech Sweden AV1/HEVC comparison by Jan Ozer: https://www.youtube.com/watch?v=KzqOIddTNPQ

Hopefully the AV1 update by Jai Krishna will be uploaded soon. For those who are impatient, the slides are here: https://speakerdeck.com/stswe/av1-up...an-from-google
only ~25% better compression than vp9 so far. They were claiming 30% by bitstream freeze, lets hope they make it.

They have delayed the bitstream freeze to January now instead of end of year, not a big deal.

Last edited by hajj_3; 28th November 2017 at 02:09.
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Old 29th November 2017, 21:06   #359  |  Link
VincAlastor
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https://demo.bitmovin.com/public/firefox/av1/

how can i grab this demo stream? I wanna analyse and test this stream outside of firefox.
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Old 29th November 2017, 21:12   #360  |  Link
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Code:
youtube-dl https://bitmovin-demos.commondatastorage.googleapis.com/mozillaAV1_Oct2017/e87fb2378f01103d5d6e477a4ef6892dc714e614_v1/stream.mpd
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