Who is the expert in "RTP fragment" related issue

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Who is the expert in "RTP fragment" related issue

Revathy-4
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?

Actually we are losing packets.

Please suggest us a solution.


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RE: Who is the expert in "RTP fragment" related issue

Goldschmidt Simon

> 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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RE : Who is the expert in "RTP fragment" related issue

Frédéric BERNON
In reply to this post by Revathy-4
Hi,

Do you use RTP/UDP or RTP/TCP? When you say 1500 bytes, is it on the RTP payload size, or the full packet size (what you see with a network sniffer)?
 
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-----Message d'origine-----
De : lwip-users-bounces+frederic.bernon=[hidden email] [mailto:lwip-users-bounces+frederic.bernon=[hidden email]] De la part de revathy
Envoyé : mercredi 23 mai 2007 14:56
À : Lwipgroup
Objet : [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?

Actually we are losing packets.

Please suggest us a solution.


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Re: Who is the expert in "RTP fragment" related issue

Mumtaz Ahmad
In reply to this post by Goldschmidt Simon
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" <[hidden email]>
To: <[hidden email]>; "Mailing list for lwIP users"
<[hidden email]>
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
>
>
> _______________________________________________
> lwip-users mailing list
> [hidden email]
> http://lists.nongnu.org/mailman/listinfo/lwip-users



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DHCP / AutoIP Cooperation (send udp with ip.src 0.0.0.0 while configured)

Spies, Dominik
 Hallo!

If DHCP does not find a server, it should use autoip to get an
IP-address.
This is the behaviour im programming at the moment.
But, DHCP should not stop to try to find a DHCP server.
The problem is that in the DHCP code UDP is used and the ip.src address
is set to the address the interface is configured, Normally this is
0.0.0.0, but with autoip theres a 169.254.0.0/16 address in use.

Is this a problem? If it is, how could it be solved, or, what is the
prefered way to solve it?

Dominik


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