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RTSP not working with MediaHawk server

From: Andrius Didzbalis <andrius.didzbalis_at_elsystems.lt>
Date: Sun, 28 Nov 2010 20:56:12 +0200

Hello,

I've been trying to write my own RTSP client using libcurl. My
application works fine when used with live555MediaServer, however I am
not able to negotiate with MediaHawk VoD server correctly. The problem
is with the DESCRIBE response - there is an extra '\r\n' after SDP. curl
library returns this extra '\r\n' as a response to the next RTSP command
(SETUP) and fails. The actual response to SETUP is returned prepended to
TEARDOWN response if I issue one.

Is this a bug in libcurl, mediahawk server or my program? If this is a
bug in the server is there any way to work-around it using libcurl?

I am using version 7.20.1 of libcurl. Below is the output I get:

----
* About to connect() to 77.221.64.59 port 554 (#0)
*   Trying 77.221.64.59... * connected
* Connected to 77.221.64.59 (77.221.64.59) port 554 (#0)
> OPTIONS rtsp://77.221.64.59/r1/priviet_martyske RTSP/1.0
CSeq: 1
< RTSP/1.0 200 OK
< CSeq: 1
< Date: 29 Nov 2010 01:38:03 GMT
< Public: DESCRIBE, SETUP, PLAY, PAUSE, GET_PARAMETER, TEARDOWN
< Server: MediaHawk
< Content-Length: 0
< 
* Connection #0 to host 77.221.64.59 left intact
* Re-using existing connection! (#0) with host 77.221.64.59
* Connected to 77.221.64.59 (77.221.64.59) port 554 (#0)
> DESCRIBE rtsp://77.221.64.59/r1/priviet_martyske RTSP/1.0
CSeq: 2
If-Modified-Since: Thu, 01 Jan 1970 00:00:00 GMT
Accept: application/sdp
< RTSP/1.0 200 OK
< CSeq: 2
< Date: 29 Nov 2010 01:38:03 GMT
< Content-Type: application/sdp
< Content-Length:   235
< 
* Connection #0 to host 77.221.64.59 left intact
* Re-using existing connection! (#0) with host 77.221.64.59
* Connected to 77.221.64.59 (77.221.64.59) port 554 (#0)
> SETUP rtsp://77.221.64.59/r1/priviet_martyske RTSP/1.0
CSeq: 3
Transport: MP2T/H2221/UDP;unicast;client_port=0
If-Modified-Since: Thu, 01 Jan 1970 00:00:00 GMT
< 
* The CSeq of this request 3 did not match the response 0
* Connection #0 to host 77.221.64.59 left intact
* RTSP CSeq mismatch or invalid CSeq
---
Thanks in advance for Your reply :)
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Received on 2010-11-28