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Dan Julius a écrit :
<blockquote
cite="mid:131b8bd40808251114h7fc03854rf53cabd74a9c2c9b@mail.gmail.com"
type="cite">
<div dir="ltr">Hi,<br>
<br>
I was just wondering if it is safe to just drop frames?<br>
How do you know if you are not dropping part of an I frame, which will
later invalidate all following P frames?<br>
</div>
</blockquote>
The only way to know is to dig into the headers of the H.263 payload.<br>
<br>
One remark also: what should be dropped is not only an I frame but an I
frame and all the subsquent P frames up to the next I frame.<br>
I fear that such an algorithm would lead to a very bad quality.
Transcoding is the only way to go.<br>
<br>
Emmanuel<br>
<blockquote
cite="mid:131b8bd40808251114h7fc03854rf53cabd74a9c2c9b@mail.gmail.com"
type="cite">
<div dir="ltr"><br>
Thanks,<br>
Dan<br>
<br>
<div class="gmail_quote">On Mon, Aug 25, 2008 at 8:58 PM, Sergio
Garcia Murillo <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:sergio.garcia@fontventa.com">sergio.garcia@fontventa.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi
Klaus,<br>
<br>
Modify H223AL2Sender::SendPDU() in H324MAL2.cpp<br>
Check if jitBuffer.GetSize()>YOURVALUE and return<br>
<br>
BR<br>
<font color="#888888">Sergio<br>
</font>
<div>
<div class="Wj3C7c"><br>
----- Original Message -----<br>
From: Klaus Darilion [mailto:<a moz-do-not-send="true"
href="mailto:klaus.mailinglists@pernau.at">klaus.mailinglists@pernau.at</a>]<br>
To: <a moz-do-not-send="true"
href="mailto:asterisk-video@lists.digium.com">asterisk-video@lists.digium.com</a><br>
Sent: Mon, 25 Aug 2008 14:49:18 +0200<br>
Subject: [Asterisk-video] 3G video delay<br>
<br>
Hi!<br>
<br>
I have a problem with a SIP client which sends video with high bitrate<br>
if there is very much movement. This adds huge delay to the video as it<br>
does not fit anymore into the 64kbit channel.<br>
<br>
As in normal scenarios the delay is fine I want to avoid transcoding.<br>
Thus my idea was to drop video frames if the queue is getting to big.<br>
<br>
I want to test may idea, but the question is - where to do this? I think<br>
this have to be done in libh324m. Sergio, can you please tell me<br>
how/where I could implement such a behavior?<br>
<br>
regards<br>
klaus<br>
<br>
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