ungroup

Ungroups the container by splitting it into several containers containing various children of the original.

The rules for how the container splits depends on the subclass. A Group will simply split into its children. A Clip will split into one Clip per TrackType it overlaps with (so an audio-video clip will split into an audio clip and a video clip), where each clip contains all the TrackElement-s from the original clip with a matching track_type.

If recursive is true, and the container contains other containers as children, then they will also be ungrouped, and so on.

Parameters:

this	The container to ungroup
recursive	Whether to recursively ungroup this

Returns:

The list of new Container-s created from the splitting of this.