/** Signal to emit to report progress, or 0 */
boost::signals2::signal<void (float)>* _progress;
/** The edit rate; this is normally equal to the number of video frames per second */
/** Signal to emit to report progress, or 0 */
boost::signals2::signal<void (float)>* _progress;
/** The edit rate; this is normally equal to the number of video frames per second */