When changing from avi to mpeg4 it is fine when i watch it on vlc player but when i put the mpeg4 format onto my ipad the movie becomes twice s longfirst the full movie with audio and then the movie again with no audio. I don,t know how to crop off the second movie with no audio or why it is copying it twice when i play through itunes it does not do this when i play it on vlc player does anybody know the answer? Thanks.