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post #2131 of 2132 Old Yesterday, 02:49 PM
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Originally Posted by sdurani View Post
The 5.1 mix on the Blu-ray of Gravity was PCM in the theatres, so the studio could pick any lossless packing technology for the home video release.
Thanks for the explanation. Did I understand correctly we are talking about 3 different mixes?
1. Commercial theater Atmos
2. Commercial theater PCM 5.1
3. Blu-ray DTS 5.1

Curious about number 2: It is neither Dolby or DTS, since there is no need to use either of those lossless packing technologies for commercial theater systems? It's just called PCM 5.1?

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post #2132 of 2132 Old Yesterday, 03:13 PM
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Quote:
Originally Posted by cannga View Post
Did I understand correctly we are talking about 3 different mixes?
1. Commercial theater Atmos
2. Commercial theater PCM 5.1
3. Blu-ray DTS 5.1
Number 2 and 3 are the same mix (2 is uncompressed, 3 is losslessly packed to take up less room on the Blu-ray). Like if you ripped a CD to FLAC. It's not a different mix, the data is just packed more efficiently to take up less space on your hard drive.
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Originally Posted by cannga View Post
Curious about number 2: It is neither Dolby or DTS, since there is no need to use either of those lossless packing technologies for commercial theater systems? It's just called PCM 5.1?
Correct, commercial cinema hard drives don't have the space restrictions that Blu-ray discs do, so they don't need compression or packing to save storage space. The uncompressed PCM tracks are typically stored as .wav files.

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