[Asterisk-video] Help:app_rtsp cannot work in asterisk1.8

[kingman chui]

Hi,
  I install app_rtsp in 1.8.10.0-rc2  .
I cannot connect to rtsp VLC streaming server .
the rtsp VLC server is working find with VLC client and can play video in H263 format.
no audio .I disable audio .
 
I paste the extension.conf in below 
=======
exten => 2002,1,Answer()
exten => 2002,n,rtsp(rtsp://192.168.1.104:5544/)
exten => 2002,n,WaitExten(5)
exten => 2002,n,Hangup()
=======
I already enable the vidoe and code for the sip.
[20001000]
videosupport=yes
allow=all
 
But in the debug , the rtsp stream have not initiate and have not play .then it end ..
 
I paste part of the debug log below 
 
================
[Feb 21 05:25:26] DEBUG[11854] app_rtsp.c: -rtsp play loop [0]
[Feb 21 05:25:26] DEBUG[3636] manager.c: Examining event:
Event: Newexten^M
Privilege: dialplan,all^M
Channel: SIP/20001000-00000004^M
Context: from-internal^M
Extension: 2002^M
Priority: 2^M
Application: rtsp^M
AppData: rtsp://192.168.1.104:5544/^M
Uniqueid: 1329773126.4^M
^M
[Feb 21 05:25:26] DEBUG[11854] app_rtsp.c: -Receiving describe
[Feb 21 05:25:26] DEBUG[11854] app_rtsp.c: -Describe response code [200]
[Feb 21 05:25:26] DEBUG[11854] app_rtsp.c: -Receiving describe
[Feb 21 05:25:26] DEBUG[11854] app_rtsp.c: -Describe response code [2147483647]
[Feb 21 05:25:26] DEBUG[11854] app_rtsp.c: -rtsp_play end loop [0]
[Feb 21 05:25:26] WARNING[11854] app_rtsp.c: <rtsp_play
[Feb 21 05:25:26] DEBUG[11854] pbx.c: Launching 'WaitExten'
[Feb 21 05:25:26] VERBOSE[11854] pbx.c:     -- Executing [2002 at from-internal:3] WaitExten("SIP/20001000-00000004", "5") in new stack
[Feb 21 05:25:26] DEBUG[3636] manager.c: Examining event:
Event: Newexten^M
 
======
 
I attach the whole debug in this email 
 
Please advice how to fix it .
I already  know the app_rtsp have diff version in asterisk 1.6 and asterisk 1.8 .
 
I install the app_rtsp in asterisk 1.6 with app_rtsp using in 1.6 before .'
it is working .
But now , I install asterisk 1.8 and use app_rtsp with asterisk 1.8 version .
It is not work ..I already use the same set up environemnt .The same as I test in asterisk 1.6 .
 
Please advice why the app_rtsp using in asterisk 1.8 version not work ..
 
 
Thank
Regard/chui king man
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