void send_command(int command, EDL *edl, int wait_tracking, int use_inout);
void stop_playback(int wait);
void refresh_frame(int change_type, EDL *edl, int dir=1);
void send_command(int command, EDL *edl, int wait_tracking, int use_inout);
void stop_playback(int wait);
void refresh_frame(int change_type, EDL *edl, int dir=1);