[Mp4-tech] SDP file format for Mpeg-4 video stream (RTP Concern)

[=?big5?q?Derek=20Chow?=]

Hi all,
I'm writing a DirectShow RTP filter which streams the
encoded Mpeg-4 video stream into the network. For
playing back the stream, I need a SDP file which can
be opened by QuickTime Player. After I've read through
RFC3016 (RTP payload format for Mpeg-4 Audio/Visual),
I found that I need the ISO14496-2 for setting the
"config" parameter to make the QT successfully receive
and playback the video stream. 
I would like to ask, if any one can tell me how to set
the parameter "config" for different frame size and
different frame rate of a video stream, also the
encoding method (I'm using 3ivx Codec to encode the
raw video stream). Or if anyone, can kindly send me
the section of ISO14496-2 [2][4][9]?
Regards
Derek Chow
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