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Re: [Linphone-developers] problems in streaming on WAN for linphone port

From: Simon Morlat
Subject: Re: [Linphone-developers] problems in streaming on WAN for linphone ported on TI DM365
Date: Wed, 09 Jun 2010 14:36:27 +0200


Maybe RTP packets are too big then discarded while going through the
internet ?


Le jeudi 03 juin 2010 à 21:51 +0530, Abhishek Ranjan a écrit :
> HI all,
> We are using linphone source for our SIP phone development on TI DM365
> SOC. I have written filters for video encoding and decoding which uses
> TI's hardware encoder and decoder chip for video enc/dec operation and
> the rtp stack I am using as is. The audio part is same as present in
> linphone wiht G711 codec.
> For video My graph is very simple:
> cap_enc filter------> rtpsend
> rtprecv----------------->decode_display filter
> where cap_enc and decode_display filters are developed by us.
> We have successfully tested the sytem in LAN (Local Area
> Network)conditions where there is no limit on upload/download
> speed.and we have absolutely no problems in LAN testing conditions.
> But we are facing issues while making calls on WAN via proxy. We are
> getting video in only one direction. But nothing in other direction.
> The issue we are facing is linphone is not able to send RTP packets on
> other side. 
> -- Our test set up consist of one unit connected to 1 Mbps broadband
> and the other one to a 2 Mbps leased line connection.
> -- The video resolution we are using is 4-CIF
> -- tried to experiment with jitt_compensation but nothing happened
> other than increase in delay
> -- Also tried to increase the video compression by relaxing the
> quantization parameter..
> -- The video decode and display is successful on the unit which
> receives the call and this is consistent all the time. We dont get any
> successful decoding and display on the unit making the call.
> -- RTP statistics showing that no of rtp packtes successfully
> delivered to the application is very low compared to the total number
> of packets received. 
> Any suggestion on what could possibly go wrong while switching from
> LAN to WAN.
> Thanks,
> Abhishek Ranjan
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