asterisk users - Mar 2019 - Does anyone know if there is a problem with the Chrome browser and asterisk cmp2k video

Thank you Kevin.

Any idea if Google developers may decide to reset the decoder, per Joshua’s
experience?
Or perhaps asterisk developers would consider eventually add the rewrite support
in asterisk?

Always fun dealing with newer technology as it goes through several revisions.

Have a great day!

Dan

From: asterisk-users <asterisk-users-bounces at lists.digium.com> On
Behalf Of Kevin Harwell
Sent: Thursday, March 14, 2019 4:50 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion <asterisk-users
at lists.digium.com>
Subject: Re: [asterisk-users] Does anyone know if there is a problem with the
Chrome browser and asterisk cmp2k video

On Wed, Mar 13, 2019 at 10:15 AM Dan Cropp <dan at amtelco.com<mailto:dan
at amtelco.com>> wrote:
Using asterisk 16.1.1.

I’m setting up a test using the cmp2k (Cyber Mega Phone 2K Ultimate Dynamic
Edition).

I have noticed Chrome 72 had some issues with video streams.  I just upgraded to
Chrome 73 and see they still have some issues.  If I have 2 calls in a
confbridge with video set to none.  I then set the video source to a Chrome
browser and the Remote Video shown to both calls from Firefox and Chrome do not
update.  However, if I set the video source to the Firefox browser, my Remote
Video is accurate in both Firefox and Chrome.
I confirmed that asterisk is indicating the video source changed by looking at
the AMI BridgeVideoSourceUpdate event.

When I use the Firefox (65.0.2) browser I can set either call to be the video
source and the Remote Video updates accordingly.

Is this caused by Chrome’s video sent to asterisk being some format which
asterisk can’t use in the confbridge?

The way I understand it is that video stream has changed, so the browser needs
some way to know that. Otherwise the decoder thinks it's invalid data and
drops it. In these cases either Asterisk needs to issue a renegotiation
(currently not supported), or the codec needs to contain video stream
information in their payload. I spoke with Joshua Colp about this some as
he's had some dealings with this and he had the following to say:

"Some codecs (such as VP8/V9) embed information about the video stream
within their payload. Asterisk does not currently rewrite this information, so
when a stream change occurs in Asterisk using the selective source functionality
this can cause the receiving side (the browser) to drop the payload as it sees
it as not being part of the existing stream. Different browsers can behave
differently, such as resetting the video decoder to handle the new stream.
Rewriting this information in the video payload is not currently
supported."

So you are probably seeing it work or not in Chrome vs Firefox due to browser,
and codec support of such occurrences.

   .... <snip config> ....

--
Kevin Harwell
Digium - A Sangoma Company | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: https://digium.com & https://asterisk.org
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On Fri, Mar 15, 2019, at 11:29 AM, Dan Cropp wrote:
>  
> Thank you Kevin.
> 
> 
> Any idea if Google developers may decide to reset the decoder, per 
> Joshua’s experience?
It's hard to really know the way things will go in the end, it's always
evolving.
 
> Or perhaps asterisk developers would consider eventually add the 
> rewrite support in asterisk?
It's certainly something that could be done, I just don't know of anyone
working on it right now or if anyone plans to.

-- 
Joshua C. Colp
Digium - A Sangoma Company | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: www.digium.com & www.asterisk.org

Thank you Joshua


-----Original Message-----
From: asterisk-users <asterisk-users-bounces at lists.digium.com> On
Behalf Of Joshua C. Colp
Sent: Friday, March 15, 2019 9:32 AM
To: asterisk-users at lists.digium.com
Subject: Re: [asterisk-users] Does anyone know if there is a problem with the
Chrome browser and asterisk cmp2k video

On Fri, Mar 15, 2019, at 11:29 AM, Dan Cropp wrote:
>  
> Thank you Kevin.
> 
> 
> Any idea if Google developers may decide to reset the decoder, per 
> Joshua’s experience?
It's hard to really know the way things will go in the end, it's always
evolving.
 
> Or perhaps asterisk developers would consider eventually add the 
> rewrite support in asterisk?
It's certainly something that could be done, I just don't know of anyone
working on it right now or if anyone plans to.

--
Joshua C. Colp
Digium - A Sangoma Company | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US Check us out at:
www.digium.com & www.asterisk.org

--
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