[Asterisk-video] Integrating mpeg4 video codec in asterisk

[John Martin]

Zeeshan,

  Since Asterisk has no video codecs the only codecs that are invoked
are audio ones. They are called when asterisk decides that transcoding
between two audio formats is required, this happens (I think) when two
legs of a call are bridged. There is no such transcoding logic in
Asterisk at the moment for video and Asterisk has no notion of what
formats the video is that it it transferring around other than a very
basic codec type - there's no notion of profiles, levels, framerate,
bitrate, resolution etc. Until Asterisk can understand video more fully,
there's little hope for it being able to do anything with the video.

  I'm not sure what links there are about this, what I've learnt I've
learnt from the source :-( I've not found much on the web about the
internals of Asterisk.

 

John

 

John Martin


________________________________

From: asterisk-video-bounces at lists.digium.com
[mailto:asterisk-video-bounces at lists.digium.com] On Behalf Of Khawaja
Zeeshan
Sent: 14 June 2006 15:28
To: asterisk-video at lists.digium.com
Subject: RE: [Asterisk-video] Integrating mpeg4 video codec in asterisk

 

Dear Sir,

Thank you very much in deed for your reply. Could you please tell me how
a codec is invoked after asterisk receives an incoming call? What is the
sequence of events? Is there any web link where i could find info about
it? 

I have tried to find it out by looking at the source code but i am
stuck.

Thanks

Zeeshan

	
________________________________


	From: "John Martin" <John.Martin at AuPix.com>
	Reply-To: Development discussion of video media support in
Asterisk<asterisk-video at lists.digium.com>
	To: "Development discussion of video media support in
Asterisk"<asterisk-video at lists.digium.com>
	Subject: RE: [Asterisk-video] Integrating mpeg4 video codec in
asterisk
	Date: Wed, 14 Jun 2006 14:34:06 +0100

	Zeeshan,

	  Asterisk doesn't do anything with video at the moment, it only
passes video from either file to an IP port or from one IP port to
another. Therefore, there are no codecs in Asterisk. There are ways of
getting H.261, H.263 and H.264 into file formats that Asterisk will
recognise (through GStreamer for instance) but that is performed outside
of Asterisk.

	 

	John Martin

	
________________________________


	From: asterisk-video-bounces at lists.digium.com
[mailto:asterisk-video-bounces at lists.digium.com] On Behalf Of Khawaja
Zeeshan
	Sent: 14 June 2006 13:46
	To: asterisk-video at lists.digium.com
	Subject: [Asterisk-video] Integrating mpeg4 video codec in
asterisk

	 

	
	Hi All, 
	
	I need help. I intend to integrate mpeg4 codec in asterisk. Does
asterisk support any video codecs currently? If yes why it is not in the
"codecs" folder? 
	
	Moreover can anyone please tell me how a codec is invoked when
asterisk receives an incoming call or sends an outgong call? 
	
	I shall be very grateful if someone can help me. 
	
	Thanks 
	
	Zeeshan 

	
	

	
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