extern int mlt_playlist_clip_is_mix( mlt_playlist self, int clip );
extern void mlt_playlist_consolidate_blanks( mlt_playlist self, int keep_length );
extern int mlt_playlist_is_blank( mlt_playlist self, int clip );
+extern int mlt_playlist_is_blank_at( mlt_playlist self, int position );
extern void mlt_playlist_insert_blank( mlt_playlist self, int clip, int length );
extern void mlt_playlist_pad_blanks( mlt_playlist self, int position, int length, int find );
extern mlt_producer mlt_playlist_replace_with_blank( mlt_playlist self, int clip );