[Asterisk-video] Video content size

[Borja SIXTO]

Hi Robert,

If you will use the app_mp4 with 3gp files, the video must be in (forced 
by the 3GP/MP4 format):
SQCIF (Sous-Quart de CIF) 128 × 96
QCIF (Quart de CIF) 176 × 144 H.261
CIF 352 × 288

It the standard configuration of the Asterisk, you cannot trust in the 
SIP codec negotiations (too simple and don't care about the size, 
bandwidth and pfs...).

One solution will be to have a database with the profile of each SIP 
Video Phone (be sure to get it up to date) and use the app_transcoder to 
perform the resizing/codec adaptations.
Some Asterisk user integrate modifications (patches...) to enable best 
SIP negotiations (see the posts of Emmanuel).
Another solution will be to get the same configuration in all of the SIP 
Video Phones (and take care about the video compatibility between the 
different models/versions).

Regards,


Borja from i6net

Robert Bielik a écrit :
> Robert Bielik skrev:
>   
>> I'm doing a fastagi application (via asterisk-java) that should create/cache videos on-the-fly, and in order to do that 
>> I'd like to know the video context size (width x height). Is this available somehow?
>>
>>     
>
> Ok, bumped as I haven't been able to find the info anywhere. To clarify:
>
> What I want to know is the video frame size (in pixels) of the SIP phone on the calling side. Since the phone can
> have an almost arbitrary sized screen, I'd need to know that size (in order to render video content of correct size).
>
> And I figure that * <-> client negotiation has that info... somewhere? 
>
> Or am I missing something (which would not surprise me) ?
>
> TIA
> /Rob
>
>
>
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