[Asterisk-video] confbridge, h264 and switching

[Sergio Garcia Murillo]

Hi,

I/P frame information can be retrieved from the h263/h264 stream without 
decoding it.

Anyway, if you wan to try a full Multiconference server to integrate 
with Asterisk, you can try mine.. ;)

http://www.medooze.com/products/mcu.aspx

Best regards
Sergio

El 09/04/2012 16:34, Matthew Jordan escribió:
>
> ----- Original Message -----
>> From: "Dmitry Melekhov"<dm at belkam.com>
>> To: asterisk-video at lists.digium.com
>> Sent: Sunday, April 8, 2012 10:55:53 PM
>> Subject: Re: [Asterisk-video] confbridge, h264 and switching
>>
>> 06.04.2012 17:53, Matthew Jordan написал:
>>> Dmitry:
>>>
>>> Can you explain what you mean by "it brokes during switching"?
>> Hello!
>>
>> I mean that without i-frame talking user appears from squares and
>> other
>> strange shape still showing part of previous talker.
> <snip>
>
> Okay, now I understand what you're referring to.
>
> Yes, if the client that has been made the new video source does not
> transmit an I-Frame when they are made the video source, the receiving
> clients will predict their frames on the previously received frames
> from the previous video source.  That would lead to what you're
> describing.
>
> Since Asterisk does not interpret or decode the video streams it
> receives from the clients, it does not have a mechanism itself to
> manipulate the image.  It does, however, notify the client that is
> the new video source via a SIP INFO message that it is now the source
> of the video.  It is up to the client to know that it should then send
> an I-Frame to provide a reference point for the other clients for the
> new video images.
>
> A few questions then:
> 1. What clients are you using?  Do they support RFC 5168 (XML Schema
> for Media Control)?
> 2. If you get a SIP trace or a packet capture, do you see Asterisk
> sending the SIP INFO messages when a video update occurs?
>
> Thanks
>
> Matthew Jordan
> Digium, Inc. | Software Developer
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> Check us out at: http://digium.com&  http://asterisk.org
>
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