The audio on this DVD appears to be MPEG-1 or MPEG-2 audio. This is NOT DVD spec and therefore many standalone DVD players may not be able to play it.
I assume you\'re trying to play this on a standalone.
In order to be compatible with most DVD players, \"you\" (not you really, I mean the DVD author) should always encode audio on a DVD as PCM or AC3 audio.
There\'s not much you can do to change it without ripping it apart, converting the audio and re-assembling it. It\'s often easier to just get a DVD player that plays these non-spec DVDs.