When I use VideoInspector, the audio codec ATSC/A-52 Dolby AC3 is said to be required but I have the AC3 filter already installed. The .avi file plays sound, but the voices are very muffled. I read on a different forum to try the latest VLC from videolan.org but that didn’t work either. The video plays choppy in Winamp but fine in Windows Media Player. Same audio problem in both players. Suggestions?