[streaming] Re: Streaming over RTP

[Jean-Paul Saman]

Serdar Uezuemcue wrote:
> Hello,
> 
> i tried to stream something multicast and set in the streaming output 
> settings rtp. Then i´ve captured the stream with ethereal and i´ve seen 
> that the stream is over udp and not over rtp.

RTP is not a separate network and transport protocol. It is specifically 
designed to run on top of another Network and Transport Protocols. The 
whole RFC 1889 is written with UDP as example Network and Transport 
protocol for RTP.

> On the receiver sided client it is indifferently if i set rtp or udp in 
> the open target field.

Which is correct, see above.

> Therefore my question:
> Can i really stream over rtp ?

The short anwer is yes!

The long one comes here:

Read RFC 1889 (http://www.ietf.org/rfc/rfc1889.txt). It says that RTP is 
typically implemented on top of UDP.


1.  Introduction

    This memorandum specifies the real-time transport protocol (RTP),
    which provides end-to-end delivery services for data with real-time
    characteristics, such as interactive audio and video. Those services
    include payload type identification, sequence numbering, timestamping
    and delivery monitoring. Applications typically run RTP on top of UDP
    to make use of its multiplexing and checksum services; both protocols
    contribute parts of the transport protocol functionality. However,
    RTP may be used with other suitable underlying network or transport
    protocols (see Section 10). RTP supports data transfer to multiple
    destinations using multicast distribution if provided by the
    underlying network.



-- 
Kind greetings,

Jean-Paul Saman

Software Architect

e-mail (work): saman at natlab.research.philips.com
phone  (work): 040 27 42909
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e-mail : jean-paul.saman at ordina.nl
phone  : 040 2601200
fax    : 040 2601199


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