Just done my first imovie on an old version imovie 4. Many hours, slide show with mixed sound. Love it. Came to the end point of finding out quicktime.mov file wont play on other computers. Can't share. Have upgraded quicktime player. Not at all happy with quality of export as MP4 or AVI. Is a file converter my better option? Any suggestions on best file conversion software available. Will conversion keep quality? Preferably free! thanks.