[vlc] Re: H263 over RTP

[chris.2.dobbs at bt.com]

Many thanks Ross, very helpful, I did wondered about the 1988 h263
rfc...wasn't this termed H263 plus ?
So if I create RFC2429 RTP/H263 packets and tel the VLC player end about
the stream using an SDP it should work ok? 
I am not too familier with SDP's ,  so when u say give VLC a 'proper'
SDP, should I hand craft an SDP into a file and give this to VLC - or
can I somehow include this in the RTP/H263 packet? Seem to remember VLC
can take an SDP spec. on the command line ?
Many thanks 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 10:34
To: vlc at videolan.org
Subject: [vlc] Re: H263 over RTP

>chris.2.dobbs at bt.com wrote:
>>Please could someone help with the following:
>>I am writing some code which reads live video , compreses it to H263 
>>and transmits across UDP/RTP. I have created the RTP payload according

>>to RFC2190 (4 byte h263 header) and fired it at VLC to test. This 
>>doesn't work and I think I know why. VLC expects elementary streams 
>>over RTP to be encapsulated inside an MPEG2-TS container - I am 
>>unfamiliar witht this and have tried simply adding an MPEG2-TS header 
>>(RFC2250) and then the h263 bitstream, but suspect I need to somehow 
>>mux the h263 to mpeg2 as this is designed to carry both audio/video
muxed together?
>>Am I completely lost at sea here ? If so could someone quickly explain

>>how I can best achieve what I need to do?
>>Many regards and thanks for a great product - we use it all the time 
>>at a certain large UK telco...
>>-Chris Dobbs
>>Software contractor
>Did you compile against the live555 library too? VLC is not restricted 
>to rtp inside MPEG-TS. If you use the udp/rtp access module then yes. 
>But using the live555 access_demuxer should allow for these kinds of 
>rtp streams.

Yes - however, one more piece of information: Don't use the payload
format defined by RFC 2190; that has now been deprecated by the IETF,
and we do not support it in VLC.  Instead, use RFC 2429 (which defines
the payload format "video/H263-1998").

The LIVE555 libraries - and thus VLC - can handle this payload format,
but only if you give VLC a proper SDP description for the stream.  Note
that the "video/H263-1998" payload format must use a dynamic RTP payload
format code, and therefore the SDP description must use a "a=rtpmap:"
line.
-- 

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

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