[Live-devel] live55 rtp sequence number is duplicate

[Wang, Mark]

Hi all,

Thanks for your quickly reply.

Actually ,  the two frame sequence number is the same , but  H264 data is different,  and I notice  checksum of UDP is the same too, please look details via attached  two  JPG document.

I draw my test network  flow chart as below,  port1 and port3 are port mirroring . all packets are captured by WIRESHARK.


        [Description: port 1                         port 2                   port3      cisco switch     ,Description:    live555,Description:   wireshark]            [Description: vlc/quicktime]









My version detail  is  as below

#define LIVEMEDIA_LIBRARY_VERSION_STRING  "2010.08.22"
#define LIVEMEDIA_LIBRARY_VERSION_INT                   1282435200

[Description: Description: cid:image001.png at 01CD44BD.83193F30]
Thanks
Mark Wang


Thanks
Mark Wang


Thanks
Mark Wang

From: live-devel-bounces at ns.live555.com [mailto:live-devel-bounces at ns.live555.com] On Behalf Of Ross Finlayson
Sent: 2012年6月27日 12:44
To: LIVE555 Streaming Media - development & use
Subject: Re: [Live-devel] live55 rtp sequence number is duplicate

My OS is LINUX 2.6.37,  I send h264 and MJPEG data to VLC or QUICKTIME by live555, sometimes I can see live555 RTP sequence is duplicate, I capture some packets by tool WIRESHARK , these packets is as below

These are almost certainly duplicate packets - not distinct packets that happen to have the same RTP sequence number (because the LIVE555 RTP transmitting code always increments the sequence number each time it sends a packet).

This packet duplication could be happing somewhere on your network (e.g., by a router), or perhaps in the sender or receiver's operating system.  But it's definitely not happening in our code.

In any case, this shouldn't be a problem, because the RTP receiver will check the sequence numbers, and automatically discard any duplicate packets.  Ditto if packets get reordered on the network (which can also happen).  That's the purpose of the RTP sequence number.

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/


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