Dropping frames vs. reducing resolution

[Waikit Lau]

Hi friends, we are webRTC newbies and need some help here.

We have a peer sending webRTC video to 1-4 peers (half-duplex). When we get up to 2-4 peer receivers, we see degradation in resolution over time. We think it's the sender's encoder chewing up too much CPU, therefore it's lowering resolution. Is there a way to force it to drop frames rather than lowering resolution. If there's congestion, we want to keep resolution as high as possible and are ok dropping as many frames as possible.

Are there any flags we can set on webRTC to do this?

Appreciate any help!

[Ben Schwartz]

Have you tried just disabling cpu overuse detection?

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[Waikit Lau]

Thx for suggestion. Will try that next.

Where do we insert the flag? In createOffer, createAnswer or when creating a new RTCPeerConnection?

[Ben Schwartz]

It's in VideoOptions:

https://code.google.com/p/chromium/codesearch#chromium/src/third_party/libjingle/source/talk/media/base/mediachannel.h&sq=package:chromium&type=cs&l=396&rcl=1446218928

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[Alexandre GOUAILLARD]

hi waikit:

are you looking for a flag in the browser, in JavaScript,

or a flag in the native C++ code for a native app?

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[Waikit Lau]

Alexandre - in the browser in JS. 

[Alexandre GOUAILLARD]

Hi waikit,

You have no such flag available today.

However, the draft of the specs has a new flag to help you: RTCDegradationPreference (here)

Do not expect an implementation in browsers before Q2 2016 though.

HTH.

Alex.

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[Christoffer Jansson]

You can turn off the cpu overuse detector by passing in the "googCpuOveruseDetection": true as an optional constraint when creating the peer connection. This used to work, not sure if it does anymore, we used it in this old test page: https://github.com/webrtc/testrtc/blob/master/src/manual/peer2peer/js/main.js#L528.

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[Christoffer Jansson]

And by true i mean false off course:) E. G. googCpuOveruseDetection": false 

[Emin DENİZ]

Hi Cristoffer,

I tried to set googCpuOveruseDetection parameter as false but video Resolution keep decreasing. Have you ever try this method? Or do you have any other suggestions? Any help will be appreciated. 

Thank you 

5 Kasım 2015 Perşembe 09:00:08 UTC+3 tarihinde Christoffer Jansson yazdı:

[Christoffer Jansson]

Turns out you cannot disable it entirely, take a look at this thread.

/Chris

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/Chris

[Emin DENİZ]

Hi Chris,

Actually I start that mail thread :) I found solution for cpu limited resolution. I mention it on the last post. Now I am dealing with disable band with limited resolution. 

6 Nisan 2016 Çarşamba 10:47:06 UTC+3 tarihinde Christoffer Jansson yazdı:

[Christoffer Jansson]

Ow ;) I was replying on my phone and did not check the names on the thread, sorry.

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/Chris

[Shashank Gupta]

Hi Waikit Lau,

I am facing the exact same issue in android during webRTC integration. and from last, one week and didn't find any solution. Did you fix this issue? Could you please help me to solve this problem.

Thanks.