i would want to use a database. you can store the video's author, category, and whatever other information you wanted, along with the path to and filename of the video. then you could just use an 'id' row or something and call it from php.
for example:
http://www.foobar.com/view_movie.php?id=324
then you could query the database and pull the row with an id of 324. you could display all your information and play it.
that's sort of a general idea of how i would do it.