[Asterisk-video] sip/iax2 h.264 video?

[Olle E Johansson]

Mihai Balea wrote:
>>
>> It's broken for all codecs?  That's not good.  My employers have had a
>> change of heart and decided that maybe another codec like h.263  would be
>> a safer choice, so I was just about to give that a try..
> 
> It's not a matter of which codec as much as a matter of codec  
> negotiation.  the IAX2 protocol was designed to negotiate only one  
> codec at a time.  With video, you need to negotiate two codecs in  
> parallel (one for video and one for audio).  I posted more details  
> about it on this list, you can look for it in the archives.
> 
> Bottom line is IAX2 needs changes to support video codec negotiation  in 
> parallel to audio.  There are several ways of doing it - I  modified 
> Asterisk in the simplest, "let's change as little as we can"  way as 
> possible.  I don't think it's the best way, but it works for  us and I'm 
> not going to change it until the community decides which  way it wants 
> to go.
> 
In addition, it will need to negotiate video attributes. Please check
the "videocaps" branch for code on how to to that in SIP. It's not
finalized at all, we're still working on it, but it's a very good
start provided by John Martin/Aupix.

/O