Track objects

GESUriSource — outputs a single media stream from a given file
GESTitleSource — render stand-alone text titles
GESAudioTestSource — produce a simple test waveform or silence
GESVideoTestSource — produce solid colors and patterns
GESTextOverlayrender text onto another video stream in a GESTimelineLayer
GESTransition — base class for audio and video transitions
GESVideoTransition — implements video crossfade transition
GESAudioTransition — implements audio crossfade transition
GESImageSource — outputs the video stream from a media file as a still image.
GESEffectadds an effect build from a parse-launch style bin description to a stream in a GESSourceClip or a GESTimelineLayer