used for large media files

Greetings. I am in the process of deciding my infrastruture for a web
based application dealing with audio, video and image files. In my
discussions with web developers PostgreSql came up as a candidate for my
database. This is my FIRST introduction to this database, although I've
heard of it - I have no knowledge of using it.

What I am attempting to build is a database driven web site that allows
users to easily upload either audio, video or images of any type -
categorize the files, then output the files via streaming. I would like
the users to be able to voice annotate images and build presentations.

Would PostgreSQL be a good database for this type of application? Database
size could grow large very quickly.

I have not decided on the rest of my platform yet, for coding the
interface and presenting it.

Any input most appreciated.