Got the new iPad and tried importing an MP4 video file via iTunes. When I play it on my iPad there is video but no audio. Tried playing it on AVPlayerHD but no audio either. The file plays fine on my laptop. Uploaded other MP4 files and the iPad played it. Looking at the file, there were two audio files for two languages so I tried remuxing the file so it has one audio file but it still doesn't play. Any ideas on this problem? Thanks.