int _first_nonexistant_frame;
/** the data of the last written frame, if there is one */
boost::optional<dcp::Data> _last_written[EYES_COUNT];
/** the index of the last written video frame within the reel */
int _last_written_video_frame;
Eyes _last_written_eyes;
int _first_nonexistant_frame;
/** the data of the last written frame, if there is one */
boost::optional<dcp::Data> _last_written[EYES_COUNT];
/** the index of the last written video frame within the reel */
int _last_written_video_frame;
Eyes _last_written_eyes;