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In Reply to: Sample Size and rate of DVD-Video Movies posted by uzun on May 11, 2003 at 14:44:33:
Dolby Digital and DTS should be produced from the same master (not always) and in the vast majority of cases they're both 48kHz 20-bit. 16-bit doesn't have the dynamic range required by contemporary soundtracks.
Follow Ups:
So most movie soundtracks are 48Khz/20 bit in resolution. Not counting the artifacts created from compression, that means soundtracks generally have better than CD sound. I kind of thought they were generally 48Khz/16 bit compressed, so kind of like a compressed Redbook resolution.
yes, they're going to be 'worse than CD' in some ways: frequency wise, maybe some 'lossy' warbling in highly dynamic passages, some fizzy high end. But also probably 'better than CD' in dynamic range, and maybe in midrange...Bit depth may improve A, but lossy compression may degrade B but not neccessarily A, so it comes down to "it just sounds different".
I'm kind of surprised that they are actually using 20 bit samples. I would have thought most movies would use 16 bit samples since I get the feeling sound quality is not a high priority on most DVD-Video offerings. So it's correct to say that most movies presented on DVD use 20 bit samples at 48Khz, for both the Dolby 5.1 or DTS 5.1 mixes?
> So it's correct to say that most movies presented on DVD use 20 bit samples at 48Khz, for both the Dolby 5.1 or DTS 5.1 mixes? <Yes, we said that already.
Most movie production stages work at this resolution or above and quality is high priority, something the end step of lossy compression may or may not degrade. Soundtracks in theaters could be SDDS or even 70mm analogue and with the advent of digital theaters even the original PCM.
There's absolutely nothing about a movie that makes it low-fidelity, John William's score for 'Attack of the Clones' wasn't recorded on a MiniDisc player...
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