Hi People, I apologize if this is not the correct forum. I have a question regarding people who use handbrake. I have been trying to convert videos to mp4 and I just use the regular preset to convert avi's to mp4's and sometimes quicktime is not able to open the files that has been converted. "This document cannot be opened" I used to avi files and converted them with the same preset and one was successfully opened and the other not. The files are less than 1GB. Both files did open with VLC. I did search in the web but did not find any information as to why it was not working. So I am stumped. Can anyone give ideas?