[Asterisk-Dev] video in iax2 spec

[Nick Bachmann]

Derek Smithies wrote:

>Hi,
>
>  
>
>>>I think the RTP header used in H323 for video works very well, and should 
>>>be used in the video packets. Yes, I know RTP headers take up bytes.
>>>However, given that we are sending compressed video, an extra couple of 
>>>bytes are not going to "break the bank".
>>>
>>'m not sure that encapsulating RTP inside of IAX is necessarily going 
>>to be a good idea; you basically will then end up with multiple 
>>timestamps, and stuff like that. I'd just get the data portion (payload) 
>>to be the same, and then it should be as easy to translate the headers 
>>as it is for audio.
>>    
>>
>the advantage of putting the rtp header in the video frame is when you are 
>changing voip protocols (eg, from h323 to iax2) It becomes easy then to 
>get the conversion to work reliably. Which is what we want - is it not - 
>reliability of conversion?
> The second advantage of using the rtp header is that the packet format 
>(across all video formats) becomes consistant.
>  
>
If you're so gung-ho about RTP, just use SIP.  In my mind, the greatest 
advantage of IAX is that it isn't encumbered by nonsense.

Nick