first of all thanks for the replies! -> Bond: mp4 files, coded with Sorenson Squeeze and either the Apple AVC H.264 or Sorenson AVC Pro Codec -> tha_reaper: ok installed it tried to do it, splitted it fine but now I have (I assume) matroska files instead of MP4 / H.264 Files. And the matroska files don't play in quicktime... How do I get them back to MP4 ?