IIS Smooth Streaming Server Manifest (On-Demand)
For on-demand scenarios, the server manifest serves three key roles. Those roles are:
Specify the group of media files that comprise the presentation.
Specify heuristic parameters, such as bit rate and fragment quality index, for each track.
Abstract the layout of the tracks into files on disk for consumption by the client.
In addition to enabling consumption of media as a single cohesive presentation, the abstraction provided by the server manifest allows for a variety of management tasks to be performed without altering the underlying media files. Those tasks include:
Adding additional language tracks
Adding commentary tracks
Adding alternate video angles
Creating a limited-quality version of the presentation for non-subscription users
Each stream comprises one or more associated media files and a client manifest, which are tied together using a metadata file called the disk manifest. The disk manifest specifies the different quality levels (aggregate bit rates) available to stream content and the tracks that each quality level comprises.