Add PCM and AC3 to DVD

We are a DVD replicator in San Jose, CA. <http://www.newcyberian.com>.
Lately we receive so many DVD masters from our clients that do not have PCM or
AC3 audio stream. They play fine on most DVD players but we know that's a
violation of the DVD spec. Is there a way to add either the PCM or AC3 to the
DVD without re-authoring?

In a nutshell, no.
It's actually wrong to call such discs DVD-Video, and they cannot carry the
DVD-Video logo as they are in violation of the specifications.
I am guessing these are using MPG audio? These will *not* play in the vast
majority of US players, as MPEG audio was only ever an optional format.

      Up to a point, yes. But you need DVDLogic DVD Reauthor (quite affordable)
      and Sonic Scenarist (quite expensive) to do it.




Which is - basically - reauthoring.