Greg said this in his second reply:
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However, the DVD may not have room for both a DTS 5.1 soundtrack and a DD 5.1 soundtrack. |
Current practice is to use 1/2 rate DTS @ 768K/second, which leaves room for a 448K DD track in 5.1. This is the case with most (but not all current releases.
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So in order to legally comply with the DVD standard, the author of the DTS version of a DVD will put a DD Pro Logic soundtrack on the DVD. |
Correctly termed, it is DD2.0/Dolby Stereo, not DD Pro Logic. The results are the same, assuming sufficient DSP cycles, the PL or PL/2 algorithm can be applied to the Dolby Stereo track to derive a matrix based surround mix. As I said above the majority of DTS soundtracks are half rate @ 768K, and current practice is to include DD5.1 @448K/second + DTS @ 768K/second and sometimes DD2.0 @ 192K/second.
Full bit rate DTS is too much of a space hog @ 1.5Mbits/second + minimal requirements..
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So if you are going to compare DTS 5.1 to DD 5.1 for the same movie - get 2 different discs. The DTS 5.1 disc may not have the DD 5.1 track on it - only a DD Pro Logic. |
Give me a little bit of credit here. Do you think I'd type a comment in such as I did, and NOT use a soundtrack with both DD 5.1 and DTS5.1 included?
Examples include, but are not limited to:
Shrek, Steely Dan
Two Against Nature, Diana Krall
Live in Paris,
Unbreakable and numerous others.
Flat out, at the same volume setting, the SPL levels do not match. It is most apparent that the LFE channel, and the surrounds do not match between mixes.
Is this because the encoders are fed different mixes or because the encoders produce different results from the same in put. I sincerely hope its the former, because if its the latter something is seriously amiss with one of these two codecs. I have no way of knowing, because I'm not there seeing the inputs to the two encoders.
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[DD and DTS are codecs - standards for writing/processing the content. They are "independent" of the content - that is just because you have DD doesn't mean you have DD 5.1, you may only have a Pro Logic signal compressed by DD ]. |
See above.
Regards,