i'm having problems getting an acceptable quality of finished video for you tube posting. i have edited on imovie4 (dv cam) [G4 mirror door 2x1ghz], and the video looks great when played in imovie. however when i try to convert it, it just comes out looking rubbish (massive square blotches). have tried different approaches; direct share from imovie as qt file, exporting the dv and converting it with prism at what seem to be the highest available settings, and flv. the dv is 5Gb(it's 24 mins), and the largest mp4 is about 200Mb. i only have osx10.4, so i can't use QT pro. Anyone please got any helpful suggestions apart from get a new computer? I'm guessing i need to end up with a file of about 400Mb plus, but can't work out how to get there.