255a256,261
> 	# return with nothing if this isn't a file. 
> 	# We don't need to search on streams, for example.
> 	if (!$self->audio) {
> 		return undef;
> 	}
> 
286,291d291
< 
< 		# return with nothing if this isn't a file. 
< 		# We don't need to search on streams, for example.
< 		if (!$self->audio) {
< 			return undef;
< 		}