I have ripped some DVDs and converted them with VOB2MPG Pro to a .mpg file to play them on my stand alone player (LG HR570S). Two of them I can play normally on the stand alone, but the rest have no audio. Playing the .mpg files on with WMP I have audio.
I have also tryed to install AC3Filter - without success.
The only difference:
Converting the VOB files again I noticed that
when VOB2MPG gives  German (AC3) then I have audio
when VOB2MPG gives  German (AC3) then I have no audio
Who knows what does the number before the audio stream mean?
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Does it play properly when you use a player that relies on its own internal codecs, like VLC?
You might try using ffdshow, and make sure AC3 audio is enabled in it.
Edit: Oops, I see the problem's on a standalone. Forget the above. My mind's offline, again. Instead, post a MediaInfo report (in Tree View) of one of the videos that isn't working, and we'll see if there's something about it your player might not like.)If cameras add ten pounds, why would people want to eat them?