I'm trying to convert a .flv file into a Youtube sharing .mov file via Compressor but every time I submit it, it fails due to error code -50. It worked two hours ago (albeit, very slowly) with another .flv file but now it refuses to even try. Please help!
Sorry you're having problems, but it's not surprising. The error code is invalid media.
The easy way is to forget about Compressor and upload the Flash file directly to You Tube with their uploader.
You'll also save a generation of compression loss.