[Asterisk-video] h324m_handshake (was: app_mp4 fixed videoplayback)

[Atle Samuelsen]

* Sergio Garcia <sergio.garcia at fontventa.com> [070903 18:44]:
> ---------- Original Message ----------------------------------
> From: Atle Samuelsen <clona at cyberhouse.no>
> Reply-To: Development discussion of video media support in Asterisk<asterisk-video at lists.digium.com>
> Date:  Mon, 3 Sep 2007 17:21:29 +0200
> 
> >Hi,
> >
> >> The case of 3G calling to a sip phone is a bit more complicated, the 3g call is received and the dial is launched in the pseudo channel. When the sip client answer it start sending audio and video (which is going to be lost) and receiving no data and the h245 negotiation begins.
> >> When the 3G call is correctly negotiated and the media is correctly bridged to the sip client and it recieves correctly firs phone I frame. The problem is, again, the 3g phone will start receiving the sip client video from a random point and the video will be mangled till the sip client decides to send another iframe. 
> >> 
> >> Should think better the last case to get a good solution..
> >
> >as a "fix" what about sending a "video-is-coming" video until you recive
> >the first rtp packet with video from the other side?
> 
> What worries me is not the sip client not receiving video while the h245 negotiation is in place. The problem is that the 3g phone is going to start recieving  the encoded video stream at any point, and depending on the sip client it can take a while to get an intra frame and until then the video would not look good.
> 
> You can choose between the following.: Answering before the sip client is dialed, display a waiting for connect and hope the sip client answer it or display a video on failure (probably good for video erotic services jejeje) or dialing the sip client and make the 3g phone lose the video until the sip client sends a I frame (but not paying anything if nobody answer the call on the sip client.


Hmm.. I know think some gateways has a "please wait it's ringing"
picture, and a "picture is beeing setup" .. meaning that a callsetup
will take some longer, but you get the picture good from when the real
picture shows up. (ie got a Iframe )

- Atle



> BR
> Sergio
> 
> 
> BR
> Sergio
> 
>  
> 
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