I am using Windows XP. I am trying to use 'Prism Video Converter' to convert a DVD onto a file with 3gp format. This is the problem I got: I didn't see any error in the conversion process. However, when I open the file, there is only video, but NO audio. I also tried converting some mpg file onto 3gp format with the same effect. I tried using video compressor H263 and MPEG4, and audio compressor AMR and AAC, but I still can't hear any sound after the conversion. I'd appreciate it if anybody can shed some light on this issue.