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IMDB and sound mixes

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Time
 (Edited)

When we go to imdb.com and take a look at “Technical Specifications” we can find this (SOUND MIX):

Dolby, Dolby Stereo, Dolby SR, Dolby Digital, DTS…

I’d like to know the exact number of channels of each sound format to be sure that their blu-ray releases have the original mix. For instance, Robocop, 1987 (IMDB):

Sound Mix - Dolby SR (35 mm prints) | 70 mm 6-Track (70 mm prints) | DTS (special edition)

So, 70 mm (blow-up) 6 track, but, 35 mm? How many channels? Then, I went to blu-ray.com:

English: Dolby Digital 4.0 (Original) (Robocop)

Therefore, is Dolby SR always 4 channels? and what about the other sound formats? From what I understand…

Dolby = ?
Dolby Stereo = 4.0
Dolby SR = 4.0
Dolby Digital = 5.1
DTS = 5.1

One more example, Child’s Play, 1988 (IMDB):

Sound Mix - Dolby Stereo

Blu-ray (MGM):

AUDIO:

Codec Language Bitrate Description


DTS-HD Master Audio English 3687 kbps 5.1 / 48 kHz / 3687 kbps / 24-bit (DTS Core: 5.1 / 48 kHz / 1509 kbps / 24-bit)
Dolby Digital Audio English 224 kbps 2.0 / 48 kHz / 224 kbps / DN -4dB / Dolby Surround
Dolby Digital Audio Spanish 448 kbps 5.1 / 48 kHz / 448 kbps / DN -4dB
Dolby Digital Audio French 224 kbps 2.0 / 48 kHz / 224 kbps / DN -4dB / Dolby Surround
Dolby Digital Audio Portuguese 448 kbps 5.1 / 48 kHz / 448 kbps / DN -4dB
Dolby Digital Audio English 224 kbps 2.0 / 48 kHz / 224 kbps / DN -4dB
Dolby Digital Audio English 224 kbps 2.0 / 48 kHz / 224 kbps / DN -4dB

  • Dolby Digital Audio English 224 kbps 2.0 / 48 kHz / 224 kbps / DN -4dB

Blu-ray (Shout Factory)

AUDIO:

Codec Language Bitrate Description


DTS-HD Master Audio English 3660 kbps 5.1 / 48 kHz / 3660 kbps / 24-bit (DTS Core: 5.1 / 48 kHz / 1509 kbps / 24-bit)
DTS-HD Master Audio English 2095 kbps 2.0 / 48 kHz / 2095 kbps / 24-bit (DTS Core: 2.0 / 48 kHz / 1509 kbps / 24-bit)
Dolby Digital Audio English 192 kbps 2.0 / 48 kHz / 192 kbps / DN -4dB
Dolby Digital Audio English 192 kbps 2.0 / 48 kHz / 192 kbps / DN -4dB
Dolby Digital Audio English 192 kbps 2.0 / 48 kHz / 192 kbps / DN -4dB
Dolby Digital Audio English 192 kbps 2.0 / 48 kHz / 192 kbps / DN -4dB

I can’t see 4 channels. No release has included the original mix?

Author
Time
 (Edited)

Never use imdb for tech specs. They are notoriously wrong or inaccurate especially for sound.

Most of the time you have to go by era produced and credits on end titles or original posters and the like.

Generally mono for most films before the late 70’s. Stereo and multichannel mixes existed for large format films and roadshow engagements.
Dolby Stereo matrix would get used Post Star Wars on most standard releases unless they cheaped out and stayed mono.

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