[Asterisk-video] H264 and rtp

[Damian Minkov]

Hi all,

I'm not sure is this is the right place to ask a question but the 
question is about asterisk and video so :)
I have problem with h264 codec (I am integrating the codec into an 
application). For the tests I use to call asterisk and the echo
application, but I came up with strange results using it.
The sent packets are not received in the right order(I mean even the 
sequence numbers).
As said in the RFC one frame is sent in multiple packets and the last 
one is with set RTP Marker flag and all packets are with same time.
But that packet with marker flag set is received as first packet of the 
frame sequence and with changed sequence number.
Here is an example of which is extracted from wireshark dump (start of a 
call).
The first four packets are sent and received in right order. But you can 
see that packet  number 20 is received as packet 5.
Also some of the packets are missing(3 of them) but the sequence numbers 
are all there :

              Sent                                      
Received                       
           Length     Sequence   Time       Mark       Length     
Sequence   Time       Mark      
          1        525        116          0             no        
525      23215          0             no
          2          42        117          0             no          
42      23216          0             no
          3          24        118          0             no          
24      23217          0             no
          4        264        119          0             yes        
264      23218         0             yes
          5       1004        120      34830         no        798      
23219      35730        yes
          6       1004        121      34830         no       1004      
23220      35730         no
          7       1004        122      34830         no       1004      
23221      35730         no
          8       1004        123      34830         no       1004      
23222      35730         no
          9       1004        124      34830         no       1004      
23223      35730         no
         10       1004        125      34830         no       1004      
23224      35730         no
         11       1004        126      34830         no       1004      
23225      35730         no
         12       1004        127      34830         no       1004      
23226      35730         no
         13       1004        128      34830         no       1004      
23227      35730         no
         14       1004        129      34830         no       1004      
23228      35730         no
         15       1004        130      34830         no       1004      
23229      35730         no
         16       1004        131      34830         no       1004      
23230      35730         no
         17       1004        132      34830         no       1004      
23231      35730         no
         18       1004        133      34830         
no                                
         19       1004        134      34830         
no                                
         20        798        135      34830        
yes                                

When I make peer-to-peer call without using asterisk everything is fine.

What can be the cause of the problem ? Any ideas where to look for ?

As the received packets time and sequence is changed so is changed and 
the checksum - all I'm using to compare packets
is their length,time and order of sending. The asterisk version I'm 
testing with is 1.4.11 (its a production server thats why its pretty old).

Thanks in advance
damencho