A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Fast Content Switching with RTSP 2.0
Author(s) : T. Lohmar, et al.
Filename : draft-lohmar-mmusic-rtsp-fcs-00.txt
Pages : 14
Date : 2009-07-29
RTSP defines the setup and control for on demand and live streaming
media sessions, which are delivered via an external media transport
protocol such as RTP/UDP. RTSP does not define a mechanism to change
the content during an on-going streaming session. Such a mechanism
improves the streaming experience when a user browses through
multiple offerings on a single streaming site.
This document describes several methods to improve content switching.
The basic principle is to re-use already established transport
sessions (e.g. RTP/UDP sessions) and negotiate new content to be
delivered on the existing sessions. If additional transport sessions
are necessary, those sessions are established separately. This
principle of re-using the RTSP control and transport sessions
decreases the content switch delay to a large extent and improves the
end-user experience.
The present document defines a mechanism for switching to new
content, both when the client already has the content description
available and when it does not.
This document additionally considers switching of a single media
stream in a session, when several alternative media components are
available. For instance, the content may provide several alternate
audio tracks in different languages to be played with a single video
stream.
The principle of Fast Content Switching and Start-up is also defined
in 3GPP TS 26.234 [3GPP.26.234] for RTSP 1.0 [RFC2326].
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