Sound problem on final DVD

[jerseybri]

I have a strange problem. I had 5 swf files and 5 associated wav files. For each I brought the audio and video into a project and created 5 mpeg video files. All 5 look good (sound & video). Let's call them clip1 2, 3, 4, & 5.

I used all 5 mpeg files (clips1-5) in a new project and created a mpeg file. This one looks good.

I then burned this final mpeg file to DVD. On my PC, everything looks good. On my Sony DVD player, there are problems with sound on 4 of the 5 original clips. They sound muffled, almost to the point of being inaudible. Clip 5, however, which was created the exact same way as all the others. works fine.

I am using all the default settings.

Any clues?