/** the first picture frame index that does not already exist in our MXF */
int _first_nonexistant_frame;
/** the data of the last written frame, if there is one */
boost::optional<dcp::Data> _last_written[EYES_COUNT];
/** the first picture frame index that does not already exist in our MXF */
int _first_nonexistant_frame;
/** the data of the last written frame, if there is one */
boost::optional<dcp::Data> _last_written[EYES_COUNT];