Re: [lwip-users] Who is the expert in "RTP fragment" related issue

[Mumtaz Ahmad]

Hi

Usually ,to stream video data ,it is fragmented into chunks of 1400 bytes or
so and packetized as Rtp payloads . So saying that fragmented packets
becomes mandatory for video streaming is not true .There are many RFC that
dictate how to do that .Like RFC3016 defines such things for MPEG-4 data .

Regards



----- Original Message ----- 
From: "Goldschmidt Simon" <address@hidden>
To: <address@hidden>; "Mailing list for lwIP users"
<address@hidden>
Sent: Wednesday, May 23, 2007 5:53 PM
Subject: RE: [lwip-users] Who is the expert in "RTP fragment" related issue


>
> > Hi,
> > Currently we are working on the RTP based streaming on
> > BF533 EZKIT LITE board for a simple video streaming application.
> > In that we are able to receive all packets except fragmented
> > packets through lwip ip stack. As most of the video packets
> > are of larger size(1500 bytes) fragmented packets becomes mandatory.
> >
> > Is there any way to handle fragmented packets in lwip stack?
>
> Have you set IP_REASS (reassemble fragmented packets, and maybe
> also IP_FRAG -> send fragmented packets) to 1 to enable the IP
> fragmentation code in lwIP?
> There is currently a limitation to one received fragmented IP frame,
> which means as long as this is in progress of being reassembled, all
> fragments of other IP frames will be thrown away. That's under
> development and will soon be solved in CVS HEAD.
>
> >
> > Actually we are losing packets.
>
> That could be a problem of the limitation to one IP packet
> as described above.
>
> >
> > Please suggest us a solution.
>
> Hope that helps.
>
> Simon
>
>
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