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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Zeeshan,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> 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.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> I’m not sure what links there
are about this, what I’ve learnt I’ve learnt from the source </span></font><font
size=2 color=navy face=Wingdings><span style='font-size:10.0pt;font-family:
Wingdings;color:navy'>L</span></font><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'> I’ve not found much
on the web about the internals of Asterisk.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>John<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 color=navy face="Comic Sans MS"><span
style='font-size:12.0pt;font-family:"Comic Sans MS";color:navy'>John Martin<br>
</span></font><span lang=EN-US><o:p></o:p></span></p>
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face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;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><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>Dear Sir,<o:p></o:p></span></font></p>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>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? <o:p></o:p></span></font></p>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>I have
tried to find it out by looking at the source code but i am stuck.<o:p></o:p></span></font></p>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>Thanks<o:p></o:p></span></font></p>
<p style='margin-bottom:12.0pt'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Zeeshan<o:p></o:p></span></font></p>
<blockquote style='border:none;border-left:solid #A0C6E5 1.5pt;padding:0cm 0cm 0cm 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt'>
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<p class=MsoNormal style='margin-bottom:12.0pt'><font size=1 face=Tahoma><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: <st1:PersonName w:st="on"><i><span style='font-style:italic'>Development
discussion of video media support in Asterisk</span></i></st1:PersonName><i><span
style='font-style:italic'><asterisk-video@lists.digium.com></span></i><br>
To: <i><span style='font-style:italic'>"<st1:PersonName w:st="on">Development
discussion of video media support in Asterisk</st1:PersonName>"<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><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Zeeshan,</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> 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><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3 color=navy
face="Comic Sans MS"><span style='font-size:12.0pt;font-family:"Comic Sans MS";
color:navy'>John Martin</span></font><o:p></o:p></p>
</div>
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face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>
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</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;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><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<div>
<div>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'><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='color:#FFA34F;font-weight:bold'>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> <o:p></o:p></span></font></p>
</div>
</div>
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<o:p></o:p></span></font></p>
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