1. A method for improving the ranking of a document search system, the method comprising: obtaining video data, wherein the video data includes features of a number of individual videos; extracting the features form the video data; obtaining a query descriptive of a subset of individual videos of the video data; obtaining a ranked list of individual videos, wherein the ranking of the individual videos is based on a search technique using the text; and re-ranking the ranked list of individual videos, wherein the re-ranking is based on the extracted features and the original ranked list of individual videos.