tme at 21rst-century.com
Tue Oct 2 14:01:38 PDT 2001
Jack Moffitt wrote:
> > I've seen several references to RTP now, both here and in some other
> > forums, and I've browsed the RFC a bit, but I'm still a little confused
> > as to "what is RTP?". Obviously it's a protocol, but what does adhering
> > to the protocol buy you? Does it guarantee interoperability with other
> > applications? I had assumed that any streaming/multicast type
> > application would likely implement its own protocol, so I'm not sure
> > what the value-add of RTP support is.
> RTP is for realtime data like streaming audio/video. It's normally used
> over UDP or Multicast (although multicast is where you commonly find
> it). It has some advantages over Ogg/TCP in that it will degrade
> nicely. It won't wait forever for packets if they don't appear. After
> all, at a certain point it's not worth waiting for anyway with realtime
> RTP is useless by itself though. The packets must have a payload, and
> the payload format is codec specific. So generally an RTP system will
> include that, as well as some other things for other parts of the
> system. This area of the standards is quite intertwined, and it seems
> to make some amount of sense.
> It guaruntees interoperability (as much as anything like that can
> 'guaruntee') as the protocol level. Anything that doesn't need to know
> about the payload format can manipulate rtp packets.
> So you do implement your own payload format, but then RTP acts as your
> generic transport medium.
http://www.ietf.org/internet-drafts/draft-ietf-avt-profile-new-11.txt (or .ps)
http://www.ietf.org/internet-drafts/draft-ietf-avt-rtp-new-10.txt (or .ps)
for more details.
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