LPCM vs. TrueHD

[PeterTHX]

Originally Posted by Ascended_Saiyan

On "Stomp the Yard", I noticed that the bitrates on the TrueHD track was much higher than the bitrates on the "Letters from Iwo Jima" TrueHD track.

I popped in the Nine Inch Nails concert. The TrueHD track was at a higher bitrate level than a 5.1 LPCM at 4.6Mbps. The TrueHD track on "Jazz Legends" was almost as high as the Nine Inch Nails concert. I should also point out that the last two titles I mentioned sounded everybit as good as any 5.1 LPCM track or even slightly better (it should sound that way at the same or higher bitrate as a 16-bit 5.1 LPCM track).

Therefore, my theory is that the HD DVD TrueHD tracks maybe compressed to the point where they are no longer lossless.

It depends: the titles you mention are music tracks. Music is much more nuanced and demanding, compare a soundtrack CD to the film version, not even close.
BTW: Watch the bitrate jump on "Iwo Jima" when things get busy, especially when the music kicks in.