Posted: Wed Jun 14, 2006 4:34 am Post subject: [Asterisk-video] Integrating mpeg4 video codec in asterisk
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.
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?
Posted: Wed Jun 14, 2006 6:07 am Post subject: [Asterisk-video] Integrating mpeg4 video codec in asterisk
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.
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@AuPix.com>
Reply-To: Development discussion of video media support in
Asterisk<asterisk-video@lists.digium.com>
To: "Development discussion of video media support in
Asterisk"<asterisk-video@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.
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?
>_______________________________________________
>--Bandwidth and Colocation provided by Easynews.com --
>
>asterisk-video mailing list
>To UNSUBSCRIBE or update options visit:
> http://lists.digium.com/mailman/listinfo/asterisk-video
________________________________
FREE pop-up blocking with the new MSN Toolbar MSN Toolbar
<http://g.msn.com/8HMBEN/2755??PS=47575> Get it now!
You can post new topics in this forum You can reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum