GstScheduler An abstract class for plugable schedulers. This is a base class for custom schedulers. Get the parent #GstElement of this scheduler. @sched: the scheduler to query. @sched: @element: @sched: @element: @sched: @element: @sched: @element: @sched: @srcpad: @sinkpad: @sched: @srcpad: @sinkpad: @sched: @padlist: @Returns: @sched: @Returns: @sched: @sched: @element: @sched: @element: