Does anyone know of a good tutorial on how to make a good video converter (to .flv).
I need to check if the video is one of the available file types (also what file types is php capable of converting to flash?) and then has to convert it, and rename it.
PHP has no built in way to do this. You must run it through an exec or similar system call in order to do a conversion.
Alternatively, you'll be writing bit parsers to transcode, which will take hours in a language like PHP to run.