I was able to get around the need for an SDP exchange by taking my
MPEG-4 elementary stream, packaging it up into an MPEG-2 transport
stream, and sending that out over the network instead.
It is my understanding that SDPs are specific to MPEG-4.
No. In princlple, all RTP media players need to first receive a SDP
description that describes the stream. However, VLC is able to guess
the media type of some streams (e.g., MPEG Program Streams and MPEG
Transport Streams) without a SDP description. However, that won't
work for most media types.
In other words, you're relying upon a hack that's specific to VLC.
--
Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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