The relationship between parent-config and child-session `stream` objects

Livestreaming with Livepeer.com is easy. The first step is understanding the stream object.

There are two types of `stream` objects.

A child stream object is a single live streaming session.
A parent stream object shows the configuration and metadata totals of all its child stream sessions.

Here are some core concepts about the stream object:

The parentId of a child-session stream object is the same as the id of its parent stream object.
Child-session stream objects are read-only.
Parent stream objects are read-write.
The playback URL for a live (isActive: true) parent stream object is the same for all its sessions.
The recording playback URL for each completed live streaming session is unique and available as a parameter on the child-session stream object when requesting a list of stream sessions.