Dolby Surround specification

[frozen_fire]

I see "Dolby Surround" as an option for downmixing. In Handbrake 1.3.1, is this the 1974 version or the 2104 version of Dolby Surround?
https://en.wikipedia.org/wiki/Dolby_Pro ... y_Surround

They both share the same name, and the documentation in https://handbrake.fr/docs/en/1.3.0/adva ... sound.html does not specify.

Furthermore, in Handbrake 1.3.1, which version is the Dolby ProLogic II downmixing option?
A) DolbyProLogicII
B) DolbyProLogicIIx
C) DolbyProLogicIIz

[rollin_eng]

It’s definitely not the 2104 version

[frozen_fire]

Apologies. I re-read my post twice, looking for errors.
Correction: In Handbrake 1.3.1, is this the 1974 version or the 2014 version of Dolby Surround?

Furthermore, in Handbrake 1.3.1, which version is the Dolby ProLogic II downmixing option?
A) Dolby ProLogic II
B) Dolby ProLogic IIx
C) Dolby ProLogic IIz

[JohnAStebbins]

"Dolby Surround" is the original DolbyProLogic, i.e.the 1987 version.
Dolby ProLogic II is DolbyProLogicII

[JohnAStebbins]

Given that Dolby has chosen to re-use old terminology and apply it to it's unrelated Atmos offering, we should consider renaming "Dolby Surround" to "Dolby Pro Logic". Or maybe just remove them all together? Seriously, does anyone use this anymore?

[Deleted User 11865]

Or maybe just remove them all together? Seriously, does anyone use this anymore?

+1 HB's implementation was never that good with strongly correlated channels anyway.