[Asterisk-video] AppConference important question

[Steve Kann]

Actually, app_conference wasn't based on videoswitch (not sure what that 
is), but Borja is correct in that it doesn't transcode or "mix" video, 
it only provides (with some options) for switching video. 

The passages Salvatore quotes below describe the architecture for mixing 
audio.  In the video case, for multi-party conferences, it implements a 
"follow-the-speaker" switching algorithm, so generally all parties see 
the video stream of a whomever is speaking.

-SteveK


Borja SIXTO wrote:
> Hi Salvatore,
>
> app_conference (or app_konference) were the result of a project called 
> videoswitch.
> There is no transcoding, only video switching.
>
> To be be able to transcode, you should use app_transcode, but for the 
> moment it only support (h263p (I/O) and Mpeg4 (I) (h263 rfc2190 isn't 
> fully supported, it needs modification).
>
> Another way can be to use the Sergio's MCU (it integrate a video mixer 
> and transcoder).
> It is a base an probably need some modifications to respond to your 
> requirements.
>
> In both cases, you don't have a turn key solution for the moment.
>
> Regards,
>
>
> Borja
>
> Salvatore Frandina a écrit :
>   
>> Hi,
>>
>> I'm writing a report about videoconference support in Asterisk. I have 
>> read in README of AppConference these feature:
>>
>> Mixing design
>>
>> * Minimize encoding/decoding, minimize mixing.
>> * Minimize generational loss from trancoding.
>> * Usual cases are handled very efficiently:
>> o One speaker: That speaker's frame is sent directly to each
>> participant which uses the same codec. It is trancoded
>> _once_ for each additional codec type used by participants.
>> o Two speakers: Each speaker gets the other speaker's frames.
>> The two speaker's frames are decoded and mixed, and then
>> encoded _once_ for each codec type used by participants.
>>
>> The underline text says that the plug-in can transcode the video...i 
>> try with two softphone one with h.263 support and the other with h.264 
>> but the can't see each other, but only myself
>> Please, can you explain me?
>>
>> Thank
>>
>> -- 
>> _______________________________________
>> Salvatore Frandina
>> website: http://frandinas.altervista.org
>> mail: salvatore.frandina at gmail.com <mailto:salvatore.frandina at gmail.com>
>>
>> _______________________________________
>>
>>     
>
>   

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