BoxParser.createFullBoxCtor("stsg", "SubTrackSampleGroupBox", function(stream) {
	this.grouping_type = stream.readUint32();
	var count = stream.readUint16();
	this.group_description_index = [];
	for (var i = 0; i < count; i++) {
		this.group_description_index[i] = stream.readUint32();
	}
});

