Abstract: Various embodiments enable dynamic control of input sources for producing live (and/or archivable) streaming media broadcasts. A user interface can conveniently enable a single individual to produce a streaming media broadcast using a variety of input sources that can be conveniently grouped, selected, and modified on the fly if so desired. User-defined source groups enable an individual to select and arrange source inputs for the streaming media broadcast. In some embodiments, source groups can have properties and behaviors that can be defined by the individual before and even during a broadcast session.