Code change:
3.2.3. <del> Where media is received from a live broadcast or stream either as a broadcast with fixed duration or as ongoing 24/7 output.  The number of receivers may vary depending on the type of content; breaking news events may see sharp, sudden spikes, whereas sporting and entertainment events may see a more gradual ramp up with a higher sustained peak with some changes based on match breaks or interludes. </del> <ins> In a reference live streaming example shown below, the emitter streams one or more tracks as part of the application operated under a provider domain, which is then distributed to multiple clients using some form of distribution server operating under the same provider domain, over a content distribution network. In this setup, one can visualize the ingest and distribution as two separate systems operating within a given provider domain.  One implication of this organization is that the Track Ids used by the emitter need not match the ones referred to by the subscribers.  This can be the case because the distribution server sources the media as new tracks (for instance, if the media is transcoded after ingest) In Live Media Streaming, media might be received from a live broadcast or stream either as a broadcast with fixed duration or as ongoing 24/7 output.  The number of receivers may vary depending on the type of content; breaking news events may see sharp, sudden spikes, whereas sporting and entertainment events may see a more gradual ramp up with a higher sustained peak with some changes based on match breaks or interludes. </ins> Such broadcasts may comprise of multiple audio or video outputs with different codecs or bitrates, and may also include other types of

Related discussion:
text: Are there scenarios in which it would be useful to be able to ingest multiple MediaStreamTracks (either audio or video)? I ask because the RUSH draft doesn't support ingestion of multiple tracks and I've been told that this is a problem by some customers. Section 2.4 A media switch, sourcing tracks that represent a subset of tracks from across all the emitters. Such subset may represent tracks representing top 5 speakers at higher qualities and lot of other tracks for rest of the emitters at lower qualities. [BA] The use of the term "media switch" suggests to me that it is forwarding tracks, rather than sourcing (e.g. transcoding) them. Can you clarify? subscribing to subset of the tracks [BA] I think there may be an implicit assumption here, which is that the receiver only indicates the track it wishes to subscribe to, rather than indicating the quality it wishes to receive. Above setup brings in following properties on the data model for the transport protocol [BA] The paragraphs that follow appear to describe different ways that the system could be implemented, rather than "properties on the data model". Do you mean to say that the design should be able to handle any of the approaches described? Media Switches to source new tracks but retain media payload from the original emitters. This implies publishing new Track IDs sourced from the SFU, with object payload unchanged from the original emitters. [BA] Is the term "source new tracks" implied by changing the Track IDs? If the payload is retained, this seems like forwarding to me, rather than "sourcing new tracks". Media Switches to propogate subset of tracks as-is from the emitters to the subscribers. This implies Track IDs to be unchanged between the emitters and the receivers. [BA] What does "as-is" mean here? Are you referring only the lack of a change in the "Track ID"? If the switch drops some frames in order to reduce quality (and bandwidth consumption) is it still "as-is"? Subscribers to explictily request multiple appropriate qualities and dynamically move between the qualtiies during the course of the session [BA] Is it a goal to be able to support such a "receiver driven" approach, as well as the other two approaches, which are sender driven?