Experimental VP9 SVC support

[Lorenzo Miniero]

Hi guys,

as part of a joint effort with Cosmo software, I just published an experimental PR that provides VP9 SVC support in the VideoRoom plugin:

https://github.com/meetecho/janus-gateway/pull/925

Feedback welcome!

Lorenzo

[Ju Ju]

you can count on me ;)

I think the most important is to look VP9 impact on device CPU

[Ju Ju]

Just read your PR, just to be sure I have well understood

You now support the 3 layer types ? :

spatial -> ok

temporal -> ok

quality (different encoding qualities) ? it seems to me the anwser is "yes" but just to be sure

J-

[Ju Ju]

Found my answer

With the above setting, the VP9 encoder will produce 2 spatial layers (with size and size/2) and 3 temporal layers (at FPS, FPS/2 and FPS/4) and no quality layers.

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[Lorenzo Miniero]

The webrtchacks link explains how it all works better than I can do.

L.

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[Ju Ju]

Actually I can’t find any information about support of quality layer (SNR)  in VP9 (possible/not possible, planned or not) ?

Too bad as it is the most important layer IMHO for scaling.

The major issues with VP9 are :

VP9 asked a lot of CPU to run (even more to encode !)

VP9 is not supported by many devices even for decoding (like my testing Samsung ACE) 

It will takes a lot of time before you could use it without asking you how many customers would be able to compatible.

IMHO the next best layer behind the quality one is the spatial layer.

I’m sure you are aware H264 (I know you are not a big fan :-) )  is already able of scaling using spatial layer (as VP8 is able to use temporal layer) but need some work on SFU side to support this feature.

It would be really great to have this feature while VP9 is not widely support by all the device, which could be not before several years.

J-

[Lorenzo Miniero]

That may be, but no browser does that. VP9 SVC is the only experiment right now.

L.

[Lorenzo Miniero]

FYI, http://www.meetecho.com/blog/availability-of-chrome-interoperable-vp9-svc-in-janus-a-meetecho-cosmo-collaboration/

L.

[Lorenzo Miniero]

After merging the VP8 simulcast branch, I decided to merge the VP9 SVC branch as well. Apparently that's the only way to force people to look at something and play with it ;-)

Lorenzo

[Ju Ju]

For whom who want to test it using un mac :

start chrome using the terminal like this :

/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --force-fieldtrials=WebRTC-SupportVP9SVC/EnabledByFlag_2SL3TL/

It works pretty well with all the layer but it seems FPS drop hard after few minutes

My MBP is at 40% CPU and I m using wired gigabit connection, so I can't explain the FPS drop

J-

[Victor Duvanenko]

I tried to get VP9 SVC Janus Demo going, launching Chrome browser with "--force-fieldtrials=WebRTC-SupportVP9SVC/EnabledByFlag_2SL3TL/" but the UI element to select the layers didn't show up.

Is there something else that needs to be done, or is there something else that needs to be done to get the SVC Demo going?

Thanks,

-Victor

[Lorenzo Miniero]

Are you using the VP9 demo page and not the regular VideoRoom demo?

L.

[Victor Duvanenko]

Yes, I'm using the VP9 SVC Demo room (https://janus.conf.meetecho.com/vp9svctest.html)

[Lorenzo Miniero]

Then you probably did something wrong launching the browser, or maybe you had another instance of Chrome already running. Either close all Chrome instances before launching with those flags, or pass the fags to a new Chrome profile.

L.

[Mirko Brankovic]

I also can't get the layers, but I can't remember when this PR appeared i remember I maybe could...

I think that SVC vp9 was removed from WebRTC 1.0 and will be added in NV version so maybe that is the reason why this happens?

[lmin...@gmail.com]

It seems to still be working for me. Make sure you're launching Chrome with the right flag, as it's disabled by default.

L.

[Mirko Brankovic]

I do start it with:

~ $ google-chrome-stable --force-fieldtrials=WebRTC-SupportVP9SVC/EnabledByFlag_2SL3TL/

killed all previous browsers opened but I guess i'm doing something wrong.

Tried both Chromium and Chrome.

Out of curiosity, which Chrome version are you on?

Mine is: Version 69.0.3497.81 (Official Build) (64-bit)

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Regards,

Mirko

[lmin...@gmail.com]

Il giorno mercoledì 16 gennaio 2019 11:29:17 UTC+1, Mirko Brankovic ha scritto:

I do start it with:

~ $ google-chrome-stable --force-fieldtrials=WebRTC-SupportVP9SVC/EnabledByFlag_2SL3TL/

killed all previous browsers opened but I guess i'm doing something wrong.

Tried both Chromium and Chrome.

Out of curiosity, which Chrome version are you on?

Mine is: Version 69.0.3497.81 (Official Build) (64-bit)

73.0.3642.0, I'm always on Canary.

L.

 

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Regards,

Mirko

[Mirko Brankovic]

oh thx, let me try canary

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Regards,

Mirko

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Regards,

Mirko

[Mirko Brankovic]

oh no i need  windows :D

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Regards,

Mirko

[lmin...@gmail.com]

Windows? No, I'm on Fedora and it works for me.

L.

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Regards,

Mirko

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Regards,

Mirko

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Regards,

Mirko

[Mirko Brankovic]

So on canary download site i get not suppoerted for Linux, so I guess i need to build it from source maybe.

and google-chrome-beta is Version 72.0.3626.64 (Official Build) beta (64-bit)

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Regards,

Mirko

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Regards,

Mirko

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Regards,

Mirko

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Regards,

Mirko

[lmin...@gmail.com]

Ah, I wouldn't know about that. I didn't install it manually, I have all the Chrome versions available in a repo through dnf/yum.

L.

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Regards,

Mirko

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Regards,

Mirko

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Regards,

Mirko

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Regards,

Mirko

[Mirko Brankovic]

hehe nice but how :D i can't :cry:

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Mirko

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Regards,

Mirko

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Mirko

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Regards,

Mirko

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Mirko

[Alessandro Amirante]

What's your distribution? If you use apt and have the google-chrome.list, Canary is called google-chrome-unstable.

A.

[Mirko Brankovic]

Also on fedora dnf but was adding google repo manually 

[Mirko Brankovic]

===========================================================================================================================================

 Package                                                          Arch                                             Version                                                 Repository                                                    Size

===========================================================================================================================================

Installing:

 google-chrome-unstable                                           x86_64                                           73.0.3673.0-1                                           google-chrome-beta                                            56 M

===========================================================================================================================================

So

rry for my noobishness :D now i see the package that provided me with 73 :)

Thanks Alessandro and Lorenzo 

[Mirko Brankovic]

But still on the VP9 demo i still don't see anything special, so not sure how SVC demo should look like, I suspect I should see buttons like on ?simulcast=true demo

I did start 73 with this flags:

google-chrome-unstable --force-fieldtrials=WebRTC-SupportVP9SVC/EnabledByFlag_2SL3TL/

[lmin...@gmail.com]

Mh not sure, it definitely works for me. Yes, you should see something like this: https://www.meetecho.com/blog/wp-content/uploads/2017/06/janus-vp9svc.jpg

Make sure all Chrome instances are closed before launching it with the flags, though, otherwise they will be ignored.

L.

[Mirko Brankovic]

aaaah silly me, I was using my older version of janus :D

I just tried it on https://janus.conf.meetecho.com/vp9svctest.html and works perfectly.

Thanks