void set_bbt (nframes_t, bool);
void set_minsec (nframes_t, bool);
void set_frames (nframes_t, bool);
nframes_t get_frames (Field,nframes_t pos = 0,int dir=1);
void set_bbt (nframes_t, bool);
void set_minsec (nframes_t, bool);
void set_frames (nframes_t, bool);
nframes_t get_frames (Field,nframes_t pos = 0,int dir=1);