[vlc] Re: H263 over RTP

[chris.2.dobbs at bt.com]

Maby should read up on SDP's !
Will give it all a go - I just discovered that the machine hosting my
server has crashed so I'll have to wait till our operators get bored of
playing xtank and reboot it (BOFH's all of them...)
many thanks Ross for your time.

-Chris

-----Original Message-----
From: vlc-bounce at videolan.org [mailto:vlc-bounce at videolan.org] On Behalf
Of Ross Finlayson
Sent: 23 February 2007 13:00
To: vlc at videolan.org
Subject: [vlc] Re: H263 over RTP

>I have had a re-think and correct me if I'm wrong but I think I need to

>do the following:
>
>1. Create an sdp that looks like this:
>
>v=0
>o=- 49451 3 IN IP4 132.146.168.35
>s=Test H263 stream
>i=Parameters for the session streamed by "testH263"
>t=0 0
>m=video 49170 RTP/AVP 98
>a=rtpmap:98 H263-1998/7775
>a=fmtp:98 profile=0; level=40
>b=TIAS:2048000

There are at least a couple of things wrong with this:

1/ You need a "c=" line, to specify the destination network address. 
Because you're not using RTSP, you should use multicast - i.e., specify
a multicast address in the "c=" line.  (I don't think you'll be able to
get unicast streaming to work without using RTSP.)

2/ The number following "H263-1998/" in the "a=rtpmap:" line is supposed
to be the RTP timestamp frequency.  7775 is wrong - for this RTP payload
format, it must be 90000 (i.e., 90 kHz).

>3. At server end(ip 132.146.168.35), I stream out UDP/RTP/H263 
>(RFC2429) to port 7775

No, the port number is the number given in your "m=" line - in this
case, 49170.  (Note that the port number should be even, as it is in
this case.)
-- 

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/

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