6. The method of claim 1 further comprising: sorting the set of signatures according to a count of the number of times a closely matching signature appears in the set of signatures to find likely matching reference multimedia clip signatures.
7. The method of claim 6 further comprising: determining a plurality of scores, wherein each score is based on a distance between the N dimension query audio signature and the N-dimensional query video signature and a different signatures of the likely matching reference multimedia clip signatures; and comparing the plurality of scores with a score threshold to determine whether a reference multimedia clip associated with a score is a true positive match or a false positive match.