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Dolby Digital has always had Dialog Normalization metadata

Posted by racerguy on December 6, 2007 at 20:19:18:
TrueHD also has dialnorm. It's never been a problem in the past, so I wouldn't be so quick to blame problems on the TrueHD codec like some people are trying to do. Rather, it's more likely that problems people are experiencing are due to crappy implementations of the TrueHD decoder, and player limitations, especially on Blu-ray players.
As I noted in a previous post about TrueHD on the Panasonic players, 'if you playback TrueHD on the Panasonic DMP-BD10 and BD10A players via the analog outs, the player overrides speaker size/distance settings, making them all "large" and equidistant. Also, if the number of speakers doesn't match what the soundtrack is configured for (i.e. it's a 7.1 and you only have 5.1), you'll lose information.'
That could certainly cause "transparency" problems. I suspect the Panasonics aren't the only players to have these kinds of implementation issues.