Method to create the core #GESTrackElement of a clip
of this class. If a clip of this class may create several track elements per
track type, this should be left as %NULL, and
GESClipClass::create_track_elements should be used instead. Otherwise, you
should implement this class method and leave
GESClipClass::create_track_elements as the default implementation
Method to create the (multiple) core
#GESTrackElement-s of a clip of this class. If
GESClipClass::create_track_element is implemented, this should be kept as the
default implementation
Method to create the core #GESTrackElement of a clip of this class. If a clip of this class may create several track elements per track type, this should be left as %NULL, and GESClipClass::create_track_elements should be used instead. Otherwise, you should implement this class method and leave GESClipClass::create_track_elements as the default implementation