I can not play video or audio files encoded in mpeg 4 when they are embeded in a web page. These are files that end with the .mp4 file extention. They will not work if they are progresively downloaded or streamed with quicktime server 4. The do play fine if I play the files in the stand alone quicktime player. I tried it with a pc and I have the same problems. If i encode the file into mpeg 4 audio/video but in the .mov file format, everything works fine. Can someone tell me why? I have encoded files in the MPEG 4 format with Quicktime 6 preview edition.