RE: [Nokia-private-dev] RTP timestamp issue when streamming from vidiator server(Live streaming)

As per the tester the media player starts to stream from the server link then at 0:01 "Buffering", then again at 0:03 "Buffering" and gets stuck in Buffering. 

Here is an extract from the helix trace log received from the tester(Attached helix trace log). Please look at the first packet log, the RTP packet time is 164000. HXTimeval and RTPTimeval calculated using this value is a huge value 4294951296(ie, 164000(RTP Packet time) -180000(RTPOffset time) = 
 negative value => converted to unsiged => 4294951296). I think it is a possible cause to get the above error. Please look at the attached helix log for more detail.
 
[13:13:07.610] xti1:MCU_ASCII_PRINTF; channel:0xE0; msg:RTSP¿2491753876¿0336¿RTPBaseTransport[0x71d140]::_handlePacket() PKT(Strm=1): (Seq=     1,RTPTime=    164000) -> (HXTimeval=4294
[13:13:07.610] xti1:MCU_ASCII_PRINTF; channel:0xE0; msg:966296,RTPTimeval=4294951296)|
[13:13:09.469] xti1:MCU_ASCII_PRINTF; channel:0xE0; msg:RTSP¿2491755808¿0336¿RTPBaseTransport[0x71d140]::_handlePacket() PKT(Strm=1): (Seq=     2,RTPTime=    166560) -> (HXTimeval=4294
[13:13:09.532] xti1:MCU_ASCII_PRINTF; channel:0xE0; msg:966456,RTPTimeval=4294953856)|
[13:13:09.532] xti1:MCU_ASCII_PRINTF; channel:0xE0; msg:RTSP¿2491755860¿0336¿RTPBaseTransport[0x71d140]::_handlePacket() PKT(Strm=1): (Seq=     3,RTPTime=    169120) -> (HXTimeval=4294
[13:13:09.532] xti1:MCU_ASCII_PRINTF; channel:0xE0; msg:966616,RTPTimeval=4294956416)|
[13:13:10.735] xti1:MCU_ASCII_PRINTF; channel:0xE0; msg:RTSP¿2491756929¿0336¿RTPBaseTransport[0x71d140]::_handlePacket() PKT(Strm=1): (Seq=     4,RTPTime=    171680) -> (HXTimeval=4294
[13:13:10.735] xti1:MCU_ASCII_PRINTF; channel:0xE0; msg:966776,RTPTimeval=4294958976)|
[13:13:10.735] xti1:MCU_ASCII_PRINTF; channel:0xE0; msg:RTSP¿2491756931¿0336¿RTPBaseTransport[0x71d140]::_handlePacket() PKT(Strm=1): (Seq=     5,RTPTime=    174240) -> (HXTimeval=4294
[13:13:10.735] xti1:MCU_ASCII_PRINTF; channel:0xE0; msg:966936,RTPTimeval=4294961536)|
[13:13:11.125] xti1:MCU_ASCII_PRINTF; channel:0xE0; msg:RTSP¿2491757461¿0336¿RTPBaseTransport[0x71d140]::_handlePacket() PKT(Strm=1): (Seq=     6,RTPTime=    176800) -> (HXTimeval=4294
[13:13:11.125] xti1:MCU_ASCII_PRINTF; channel:0xE0; msg:967096,RTPTimeval=4294964096)|
[13:13:11.125] xti1:MCU_ASCII_PRINTF; channel:0xE0; msg:RTSP¿2491757463¿0336¿RTPBaseTransport[0x71d140]::_handlePacket() PKT(Strm=1): (Seq=     7,RTPTime=    179360) -> (HXTimeval=4294
[13:13:11.125] xti1:MCU_ASCII_PRINTF; channel:0xE0; msg:967256,RTPTimeval=4294966656)|
[13:13:11.125] xti1:MCU_ASCII_PRINTF; channel:0xE0; msg:RTSP¿2491757464¿0336¿RTPBaseTransport[0x71d140]::_handlePacket() PKT(Strm=1): (Seq=     8,RTPTime=    181920) -> (HXTimeval=   
[13:13:11.125] xti1:MCU_ASCII_PRINTF; channel:0xE0; msg:   120,RTPTimeval=      1920)|
[13:13:11.141] xti1:MCU_ASCII_PRINTF; channel:0xE0; msg:RTSP¿2491757468¿0336¿RTPBaseTransport[0x71d140]::_handlePacket() PKT(Strm=1): (Seq=     9,RTPTime=    184480) -> (HXTimeval=   
[13:13:11.141] xti1:MCU_ASCII_PRINTF; channel:0xE0; msg:   280,RTPTimeval=      4480)|
[13:13:11.141] xti1:MCU_ASCII_PRINTF; channel:0xE0; msg:RTSP¿2491757469¿0336¿RTPBaseTransport[0x71d140]::_handlePacket() PKT(Strm=1): (Seq=    10,RTPTime=    187040) -> (HXTimeval=   
[13:13:11.141] xti1:MCU_ASCII_PRINTF; channel:0xE0; msg:   440,RTPTimeval=      7040)|

________________________________

From: ext Milko Boic [mailto:[email protected]] 
Sent: Tuesday, May 20, 2008 3:56 PM
To: Adookkattil Saleem (Nokia-D-MSW/Dallas); [email protected]; [email protected]; [email protected]
Subject: Re: [Nokia-private-dev] RTP timestamp issue when streamming from vidiator server(Live streaming)


At 01:22 PM 5/20/2008, [email protected] wrote:


	Content-class: urn:content-classes:message
	Content-Type: multipart/alternative;
	         boundary="----_=_NextPart_001_01C8BAB7.3D5EE1DA"
	
	Hi, 
	
	There is a live vidiator server streaming link and upon trying to stream from this link helix client receives few audio stream RTP packets with timestamp less than the RTPOffset time initially. It causes helix time calculation failure. 


What is the failure?




	Here is the RTP PLAY command and PLAY response from vidiator server. 
	
	PLAY dynstream RTSP/1.0 
	CSeq: 7 
	User-Agent: RealMedia Player HelixDNAClient/10.0.0.6839 (S60 HX cvs_cays221_20080327:05:00:00utc 27 Mar 2008 21:00) 
	Session: C03A5301C621C22D 
	Range: npt=0- 
	Bandwidth: 1432572 
	
	RTSP/1.0 200 OK 
	CSeq: 7 
	Date: Tue, 15 Apr 2008 16:34:11 GMT 
	Session: C03A5301C621C22D 
	Range: npt=now- 
	RTP-Info: url=rtsp://10.63.48.228/dynstream/2;seq=1;rtptime=180000, url=rtsp://10.63.48.228/dynstream/1;seq=1;rtptime=180000
	
	Server: Vidiator Server/3.3 
	
	Sample RTP Audio Packet timestamp sequence 
	
	SEQ: 1,  Timestamp: 164000*     
	SEQ: 2,  Timestamp: 166560* 
	SEQ: 3,  Timestamp: 169120* 
	SEQ: 4,  Timestamp: 171680* 
	SEQ: 5,  Timestamp: 174240* 
	SEQ: 6,  Timestamp: 176800* 
	SEQ: 7,  Timestamp: 179360* 
	SEQ: 8,  Timestamp: 181920 
	SEQ: 9,  Timestamp: 184480 
	SEQ: 10, Timestamp: 187040 
	SEQ: 11, Timestamp: 189600 
	SEQ: 12, Timestamp: 192160 
	
	Sample RTP Video Packet timestamp sequence 
	SEQ: 1,  Timestamp: 180000 
	SEQ: 2,  Timestamp: 187200 
	SEQ: 3,  Timestamp: 194400 
	SEQ: 4,  Timestamp: 201600 
	SEQ: 5,  Timestamp: 208800 
	SEQ: 6,  Timestamp: 216000 
	SEQ: 7,  Timestamp: 223200 
	SEQ: 8,  Timestamp: 226800 
	SEQ: 9,  Timestamp: 234000 
	SEQ: 10, Timestamp: 241200 
	SEQ: 11, Timestamp: 244800 
	SEQ: 12, Timestamp: 252000 
	
	We could fix this error in couple of ways as given below. 
	
	1) Drop RTP packet(s) with timestamp < RTP offset time 
	2) If the first RTP packet timestamp is less than the received RTP offset time  correct RTP offset time to first RTP packet time.
	
	Looking for input/suggestion from community to make a fix to this failure. 
	
	Thanks 
	Saleem 
	_______________________________________________
	Nokia-private-dev mailing list
	[email protected]
	http://lists.helixcommunity.org/mailman/listinfo/nokia-private-dev

_______________________________________________
Helix-client-dev mailing list
[email protected]
http://lists.helixcommunity.org/mailman/listinfo/helix-client-dev