[h323plus] RTP Issue using H323plus

Simon Horne s.horne at packetizer.com
Mon Jun 13 10:21:32 EDT 2011

Seq 2 is out of order and is ignored.  A frame buffer/sequencer would fix
the problem and this is on the to-do list.


-----Original Message-----
From: h323plus-bounces at lists.packetizer.com
[mailto:h323plus-bounces at lists.packetizer.com] On Behalf Of
kcooi12345 at gmail.com
Sent: 13 June 2011 18:42
To: h323plus at lists.packetizer.com
Subject: [h323plus] RTP Issue using H323plus

Dear H323plus Member,

Recently, I found a RTP issue that happened in H323plus v.1.22.0(The version
I used).

During all the testing, I used wireshark to capture RTP video packets and
check for its timestamps, sequence numbers and other information.

whenever the received RTP video packets is coming in unorder sequence
number(eg. seq 0, seq 1, seq 3, seq 2, seq 4, and etc), the received packets
that passed to video codec(eg. H.264 codec) for decoding will be seq 0, seq
1, seq 3, and seq 4 and etc.

The RTP packet with seq 2 will be missing(not passed to decoder for
decoding) if seq 3 which is larger is received before this.

Anyone knows why this happened?


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