<html><div style='background-color:'><P><FONT size=2>Dear Sir,</FONT></P>
<P><FONT size=2>Could you please solve my problem. I am stuck with it.</FONT></P>
<P><FONT size=2>Suppose i am a SIP client using "kphone" and set a particular codec in "audio preferences --> preferred codec". <BR><BR> How would asterisk know that this codec has been set by the client and how it will call that codec. <BR><BR>I shall be highly obliged.</FONT></P>
<P><FONT size=2>thanks <BR><BR>zeeshan</FONT><BR><BR></P>
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From: <I>"John Martin" <John.Martin@AuPix.com></I><BR>Reply-To: <I>Development discussion of video media support in Asterisk<asterisk-video@lists.digium.com></I><BR>To: <I>"Development discussion of video media support in Asterisk"<asterisk-video@lists.digium.com></I><BR>Subject: <I>RE: [Asterisk-video] Integrating mpeg4 video codec in asterisk</I><BR>Date: <I>Wed, 14 Jun 2006 16:12:33 +0100</I><BR><BR>
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<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Zeeshan,</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"> 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.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"> I’m not sure what links there are about this, what I’ve learnt I’ve learnt from the source </SPAN></FONT><FONT face=Wingdings color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Wingdings">L</SPAN></FONT><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"> I’ve not found much on the web about the internals of Asterisk.</SPAN></FONT></P>
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<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">John</SPAN></FONT></P>
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<P class=MsoNormal><FONT face="Comic Sans MS" color=navy size=3><SPAN style="FONT-SIZE: 12pt; COLOR: navy; FONT-FAMILY: 'Comic Sans MS'">John Martin<BR></SPAN></FONT><SPAN lang=EN-US></SPAN></P>
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<P class=MsoNormal><B><FONT face=Tahoma size=2><SPAN lang=EN-US style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT face=Tahoma size=2><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> asterisk-video-bounces@lists.digium.com [mailto:asterisk-video-bounces@lists.digium.com] <B><SPAN style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Khawaja Zeeshan<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> 14 June 2006 15:28<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> asterisk-video@lists.digium.com<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> RE: [Asterisk-video] Integrating mpeg4 video codec in asterisk</SPAN></FONT><SPAN lang=EN-US></SPAN></P></DIV>
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<P><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">Dear Sir,</SPAN></FONT></P>
<P><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">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? </SPAN></FONT></P>
<P><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">I have tried to find it out by looking at the source code but i am stuck.</SPAN></FONT></P>
<P><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">Thanks</SPAN></FONT></P>
<P style="MARGIN-BOTTOM: 12pt"><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">Zeeshan</SPAN></FONT></P>
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<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><FONT face=Tahoma size=1><SPAN style="FONT-SIZE: 8.5pt; FONT-FAMILY: Tahoma">From: <I><SPAN style="FONT-STYLE: italic">"John Martin" <John.Martin@AuPix.com></SPAN></I><BR>Reply-To: <I><SPAN style="FONT-STYLE: italic">Development discussion of video media support in Asterisk</SPAN></I><I><SPAN style="FONT-STYLE: italic"><asterisk-video@lists.digium.com></SPAN></I><BR>To: <I><SPAN style="FONT-STYLE: italic">"Development discussion of video media support in Asterisk"<asterisk-video@lists.digium.com></SPAN></I><BR>Subject: <I><SPAN style="FONT-STYLE: italic">RE: [Asterisk-video] Integrating mpeg4 video codec in asterisk</SPAN></I><BR>Date: <I><SPAN style="FONT-STYLE: italic">Wed, 14 Jun 2006 14:34:06 +0100</SPAN></I></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Zeeshan,</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"> 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.</SPAN></FONT></P>
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<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><FONT face="Comic Sans MS" color=navy size=3><SPAN style="FONT-SIZE: 12pt; COLOR: navy; FONT-FAMILY: 'Comic Sans MS'">John Martin</SPAN></FONT></P></DIV>
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<P class=MsoNormal><B><FONT face=Tahoma size=2><SPAN lang=EN-US style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT face=Tahoma size=2><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> asterisk-video-bounces@lists.digium.com [mailto:asterisk-video-bounces@lists.digium.com] <B><SPAN style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Khawaja Zeeshan<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> 14 June 2006 13:46<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> asterisk-video@lists.digium.com<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> [Asterisk-video] Integrating mpeg4 video codec in asterisk</SPAN></FONT></P></DIV>
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<P><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt"><BR><SPAN class=postbody>Hi All, </SPAN><BR><BR><SPAN class=postbody>I need help. I intend to integrate mpeg4 codec in asterisk. Does asterisk support any <B><FONT color=#ffa34f><SPAN style="FONT-WEIGHT: bold; COLOR: #ffa34f">video</SPAN></FONT></B> codecs currently? If yes why it is not in the "codecs" folder? </SPAN><BR><BR><SPAN class=postbody>Moreover can anyone please tell me how a codec is invoked when asterisk receives an incoming call or sends an outgong call? </SPAN><BR><BR><SPAN class=postbody>I shall be very grateful if someone can help me. </SPAN><BR><BR><SPAN class=postbody>Thanks </SPAN><BR><BR><SPAN class=postbody>Zeeshan</SPAN> </SPAN></FONT></P></DIV></DIV>
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