void stop_playback(int wait);
void issue_command(EDL *edl, int command, int wait_tracking,
int use_inout, int update_refresh, int toggle_audio, int loop_play);
void stop_playback(int wait);
void issue_command(EDL *edl, int command, int wait_tracking,
int use_inout, int update_refresh, int toggle_audio, int loop_play);