Video converter glitch

I have a website that allows videos to be uploaded in MPG and WMV, which converts to FLV and renames with [login to view URL] in a new folder, so they can be viewed on line. For some reason, it doesn't convert the files to FLV, and it won't upload a file already saved as FLV. It used to work, but it hasn't in a while. a) make sure uploading on the site works, and videos play b) post favorite videos on a new Video Interview page, giving instructions and the script for other crew to copy c) add link to candidate’s video interview onto the resume submission email