RTSP Play / Pause issue

[blackberry_dev_inc]

I've developed a client that lets you view streaming video on a blackberry through RTSP.
I'm using a darwin server to do the streaming.

It seems to work just fine the first time I use it and I can even change between two rtsp links.
But the minute I try to pause the video and play it again, I seem to have issues.

On some occassions it buffers for a long time and then starts playing but on most occassions it just refuses to start.


I'm attaching the RTSP communication between the Client and the Server.
I call for Pause at Cseq=6
I call for Play at Cseq=10


So,
1-6 is the first play + response
7-9 is the pause + response
10 onwards is play + response

DESCRIBE rtsp://61.15.173.25:554/vid1.sdp RTSP/1.0
CSeq: 1
Accept: application/sdp
User-Agent: BlackBerry

RTSP/1.0 200 OK
Server: DSS/5.5.5 (Build/489.16; Platform/Linux; Release/Darwin; state/beta; )
Cseq: 1
Cache-Control: no-cache
Content-length: 573
Date: Thu, 27 May 2010 06:49:57 GMT
Expires: Thu, 27 May 2010 06:49:57 GMT
Content-Type: application/sdp
x-Accept-Retransmit: our-retransmit
x-Accept-Dynamic-Rate: 1
Content-Base: rtsp://61.15.173.25:554/vid1.sdp/

v=0
o=- 14958220309981421598 14958220309981421598 IN IP4 guest-comp
s=Unnamed
i=N/A
c=IN IP4 0.0.0.0
t=0 0
a=recvonly
a=type:broadcast
a=charset:UTF-8
a=control:*
m=audio 0 RTP/AVP 96
b=AS:8
b=RR:0
a=rtpmap:96 MP4A-LATM/16000/2
a=fmtp:96 profile-level-id=13; object=2; cpresent=0; config=400025203fe0
a=control:trackID=1
m=video 0 RTP/AVP 97
b=AS:100
b=RR:0
a=rtpmap:97 MP4V-ES/90000
a=fmtp:97 profile-level-id=1; config=000001b001000001b58913000001000000012000c4f 8d8b588007d0584121463000001b24c61766335322e32304d4 5;
a=control:trackID=2
SETUP rtsp://61.15.173.25:554/vid1.sdp/trackID=1 RTSP/1.0
CSeq: 2
User-Agent: BlackBerry
Transport: RTP/AVP;unicast;client_port=51100-51101;mode="PLAY"

RTSP/1.0 200 OK
Server: DSS/5.5.5 (Build/489.16; Platform/Linux; Release/Darwin; state/beta; )
Cseq: 2
Cache-Control: no-cache
Session: 6255608828653768307
Date: Thu, 27 May 2010 06:49:57 GMT
Expires: Thu, 27 May 2010 06:49:57 GMT
Transport: RTP/AVP;unicast;mode="PLAY";source=182.148.254.25;clie nt_port=51100-51101;server_port=6970-6971

SETUP rtsp://61.15.173.25:554/vid1.sdp/trackID=2 RTSP/1.0
CSeq: 3
Session: 6255608828653768307
User-Agent: BlackBerry
Transport: RTP/AVP;unicast;client_port=51102-51103;mode="PLAY"

RTSP/1.0 200 OK
Server: DSS/5.5.5 (Build/489.16; Platform/Linux; Release/Darwin; state/beta; )
Cseq: 3
Session: 6255608828653768307
Cache-Control: no-cache
Date: Thu, 27 May 2010 06:49:57 GMT
Expires: Thu, 27 May 2010 06:49:57 GMT
Transport: RTP/AVP;unicast;mode="PLAY";source=182.148.254.25;clie nt_port=51102-51103;server_port=6970-6971

PLAY rtsp://61.15.173.25:554/vid1.sdp RTSP/1.0
CSeq: 4
Session: 6255608828653768307
User-Agent: BlackBerry
Range: npt=0-

RTSP/1.0 200 OK
Server: DSS/5.5.5 (Build/489.16; Platform/Linux; Release/Darwin; state/beta; )
Cseq: 4
Session: 6255608828653768307
Range: npt=now-
RTP-Info: url=rtsp://61.15.173.25:554/vid1.sdp/trackID=1,url=rtsp://61.15.173.25:554/vid1.sdp/trackID=2

OPTIONS rtsp://61.15.173.25:554/vid1.sdp RTSP/1.0
CSeq: 5
Session: 6255608828653768307
User-Agent: BlackBerry

RTSP/1.0 200 OK
Server: DSS/5.5.5 (Build/489.16; Platform/Linux; Release/Darwin; state/beta; )
Cseq: 5
Session: 6255608828653768307
Public: DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE, OPTIONS, ANNOUNCE, RECORD

OPTIONS rtsp://61.15.173.25:554/vid1.sdp RTSP/1.0
CSeq: 6
Session: 6255608828653768307
User-Agent: BlackBerry

RTSP/1.0 200 OK
Server: DSS/5.5.5 (Build/489.16; Platform/Linux; Release/Darwin; state/beta; )
Cseq: 6
Session: 6255608828653768307
Public: DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE, OPTIONS, ANNOUNCE, RECORD

OPTIONS rtsp://61.15.173.25:554/vid1.sdp RTSP/1.0
CSeq: 7
Session: 6255608828653768307
User-Agent: BlackBerry

RTSP/1.0 200 OK
Server: DSS/5.5.5 (Build/489.16; Platform/Linux; Release/Darwin; state/beta; )
Cseq: 7
Session: 6255608828653768307
Public: DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE, OPTIONS, ANNOUNCE, RECORD

PAUSE rtsp://61.15.173.25:554/vid1.sdp RTSP/1.0
CSeq: 8
Session: 6255608828653768307
User-Agent: BlackBerry

RTSP/1.0 200 OK
Server: DSS/5.5.5 (Build/489.16; Platform/Linux; Release/Darwin; state/beta; )
Cseq: 8
Session: 6255608828653768307

OPTIONS rtsp://61.15.173.25:554/vid1.sdp RTSP/1.0
CSeq: 9
Session: 6255608828653768307
User-Agent: BlackBerry

RTSP/1.0 200 OK
Server: DSS/5.5.5 (Build/489.16; Platform/Linux; Release/Darwin; state/beta; )
Cseq: 9
Session: 6255608828653768307
Public: DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE, OPTIONS, ANNOUNCE, RECORD

OPTIONS rtsp://61.15.173.25:554/vid1.sdp RTSP/1.0
CSeq: 10
Session: 6255608828653768307
User-Agent: BlackBerry

RTSP/1.0 200 OK
Server: DSS/5.5.5 (Build/489.16; Platform/Linux; Release/Darwin; state/beta; )
Cseq: 10
Session: 6255608828653768307
Public: DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE, OPTIONS, ANNOUNCE, RECORD

OPTIONS rtsp://61.15.173.25:554/vid1.sdp RTSP/1.0
CSeq: 11
Session: 6255608828653768307
User-Agent: BlackBerry

RTSP/1.0 200 OK
Server: DSS/5.5.5 (Build/489.16; Platform/Linux; Release/Darwin; state/beta; )
Cseq: 11
Session: 6255608828653768307
Public: DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE, OPTIONS, ANNOUNCE, RECORD

OPTIONS rtsp://61.15.173.25:554/vid1.sdp RTSP/1.0
CSeq: 12
Session: 6255608828653768307
User-Agent: BlackBerry

RTSP/1.0 200 OK
Server: DSS/5.5.5 (Build/489.16; Platform/Linux; Release/Darwin; state/beta; )
Cseq: 12
Session: 6255608828653768307
Public: DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE, OPTIONS, ANNOUNCE, RECORD

OPTIONS rtsp://61.15.173.25:554/vid1.sdp RTSP/1.0
CSeq: 13
Session: 6255608828653768307
User-Agent: BlackBerry

RTSP/1.0 200 OK
Server: DSS/5.5.5 (Build/489.16; Platform/Linux; Release/Darwin; state/beta; )
Cseq: 13
Session: 6255608828653768307
Public: DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE, OPTIONS, ANNOUNCE, RECORD

OPTIONS rtsp://61.15.173.25:554/vid1.sdp RTSP/1.0
CSeq: 14
Session: 6255608828653768307
User-Agent: BlackBerry

RTSP/1.0 200 OK
Server: DSS/5.5.5 (Build/489.16; Platform/Linux; Release/Darwin; state/beta; )
Cseq: 14
Session: 6255608828653768307
Public: DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE, OPTIONS, ANNOUNCE, RECORD

OPTIONS rtsp://61.15.173.25:554/vid1.sdp RTSP/1.0
CSeq: 15
Session: 6255608828653768307
User-Agent: BlackBerry

RTSP/1.0 200 OK
Server: DSS/5.5.5 (Build/489.16; Platform/Linux; Release/Darwin; state/beta; )
Cseq: 15
Session: 6255608828653768307
Public: DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE, OPTIONS, ANNOUNCE, RECORD

OPTIONS rtsp://61.15.173.25:554/vid1.sdp RTSP/1.0
CSeq: 16
Session: 6255608828653768307
User-Agent: BlackBerry

RTSP/1.0 200 OK
Server: DSS/5.5.5 (Build/489.16; Platform/Linux; Release/Darwin; state/beta; )
Cseq: 16
Session: 6255608828653768307
Public: DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE, OPTIONS, ANNOUNCE, RECORD

OPTIONS rtsp://61.15.173.25:554/vid1.sdp RTSP/1.0
CSeq: 17
Session: 6255608828653768307
User-Agent: BlackBerry

RTSP/1.0 200 OK
Server: DSS/5.5.5 (Build/489.16; Platform/Linux; Release/Darwin; state/beta; )
Cseq: 17
Session: 6255608828653768307
Public: DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE, OPTIONS, ANNOUNCE, RECORD

PLAY rtsp://61.15.173.25:554/vid1.sdp RTSP/1.0
CSeq: 18
Session: 6255608828653768307
User-Agent: BlackBerry

RTSP/1.0 200 OK
Server: DSS/5.5.5 (Build/489.16; Platform/Linux; Release/Darwin; state/beta; )
Cseq: 18
Session: 6255608828653768307
Range: npt=now-
RTP-Info: url=rtsp://61.15.173.25:554/vid1.sdp/trackID=1,url=rtsp://61.15.173.25:554/vid1.sdp/trackID=2

The sdp files seem to be fine and the video works the first time, so I'm guessing there isnt an issue with the Server.



Thanks for any help rendered.