RADPlay: RTP Archiving, Delivery, and Playback extensions for SDP Rob Lanphier RealNetworks March 21, 2002.

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Presentation transcript:

RADPlay: RTP Archiving, Delivery, and Playback extensions for SDP Rob Lanphier RealNetworks March 21, 2002

What is the problem? Classic sob story –mean old firewall administrators blocking protocol x (where "protocol x" in this particular case is streaming media) What has been done to date –Proprietary tunneling protocols: mostly effective, but the war continues to escalate –Open tunneling protocols: usually turned away by IETF, because they aren't good long term solutions –Nothing: actually, this is only what we might wish would happen

Why change the status quo? Lots of time and energy being applied to this problem Other standards groups would follow IETF lead if there was a lead to follow We can harness a lot of energy toward solving a handful of less controversial problems as a side effect

What other problems? Archiving – it would be nice to standardize an archiving protocol for RTP Cache population – it would also be nice to have a server-proxy protocol which reliably transfers live streams in a cache-ready format Archive playback – there's not much motivation right now for player vendors to ship playback for archive formats (such as rtpdump)

RADPlay Extensions to SDP a=srcfile – URL for source media in on- demand playback –Usage: playback of file when engine supports the file format (e.g..rm,.avi,.mov,.mp4) a=dumpfile – URL for "dump" of an individual stream –Usage: playback when client doesn't have file format, or when source file doesn't exist (live playback)

RADPlay Extensions to SDP (continued) a=dumpindex – Simple index to a dumpfile (time, byte-offset pairs) –Usage: seeking in the on-demand case, if "Range: npt=" is not available. Use of a=control: outside of RTSP DESCRIBE response context –Usage: allows.sdp to be a metafile for on- demand media

Example v=0 o= IN IP s=An on-demand video file a=control:rtsp://media.example.com/twister.avi a=srcfile: a=srcindex: m=audio 0 RTP/AVP 0 a=control:rtsp://media.example.com/twister.avi/audio.en a=dumpfile: a=dumpindex: m=video 0 RTP/AVP 31 a=control:rtsp://media.example.com/twister.avi/video a=dumpfile: a=dumpindex: