Dinosaurus! & stereo/surround talk (R1 USA) ADDED

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Re: Dinosaurus! (R1 USA) ADDED

Postby Eric_Cotenas » 16 Jan 2014 07:32

Jari_Kovalainen wrote:2.0 stereo vs surround can be a bit tricky since, like I said, I believe all stereo tracks add some surround activity with Pro Logic. But are they technically really 100% 2.0 surround? Is there a surround "flag" or something? And is this stereo vs 2.0 surround even that important issue?

I guess people should test the disc and watch&listen. If the dialogue is coming nicely (and sounds natural) from the front center and there's some nice (and natural) surround activity, I would say that 2.0 surround works. Then again if you're a purist and stick to the stereo option, that's probably alright too (audio wise).

Yes, it's a digital file flag just like 4:3 vs 16:9 (as in if it's incorrectly flagged, a 16:9 video will play back squished or a 4:3 stretched). Whether it sounds natural is not really relevant (I mean in the technical sense of whether the file is flagged or not, rather than what the original mix was or if it was perhaps a mono track remixed to stereo or stereo surround). It's a 2.0 surround track if the flag is there. It could be a 2-channel source with the surround flag activated or it could be the pre-matrixed Dolby Stereo stems mixed down to 2.0 and flagged, or a 5.1 mix folded down to 2.0 with surround activated (there are just as many DVDs where the 2.0 downmix of the 5.1 is not flagged). It could be the matrixed 2.0 channel source run through a Dolby Stereo decoder with the results recorded and then folded down back to 2.0. It could be a dual mono or stereo mix with the flag activated during the encoding.

Whether it was a surround mix originally or not, if it's flagged and your receiver is set to automatic then prologic will be engaged when the 2.0 source is flagged. If it was a folded down 5.1 mix or a Dolby Stereo mix, the surround content is there whether it's flagged or not (in which case you'd have to just turn on pro-logic yourself). If it was a surround mix or left-right stereo mix, Pro-logic to synthesize a mix (Pro Logic I with dual mono or stereo to four channels, or Pro Logic II with one channel up to 5.1) using its own algorithms and what it recognizes from the two channel mix as being mixed like Dolby Stereo (the sound meant for the surround channels would have had its phase shifted and mixed at 3db lower than the left and right channels while the centered dialogue would have also been set at -3db).

VLC (with Dolby Surround set to "Auto" in preferences) with a DVD featuring a surround-flagged track;
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Re: Dinosaurus! & stereo/surround talk (R1 USA) ADDED

Postby Chris_Xa » 16 Jan 2014 13:04

It can be hard to distinguish whether something is 2.0 surround vs stereo, by listening alone: It depends on speaker placement, calibration, listener objectivity & subjectivity, etc... And that's not to speak of a 2.0 surround not encoded as a 2.0 surround... in the same way that many 5.1 mixes sound frontal-only (TO KILL A MOCKINGBIRD bluray is one such example, and that was bluray even): A flag may be set, but the end result could only be a stereo sound.

So if Rewind wishes us (contributors) to advise whether something is surround or not (instead of leaving the submission as Dolby 2.0), then we'd have to rely on the software to tell us so. As tow whether it SOUNDS as 2.0 surround (vs not), guess that's up to reviewers: As I understand it, Rewind gives us "just the facts, ma'am." :)
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Re: Dinosaurus! & stereo/surround talk (R1 USA) ADDED

Postby Jari_Kovalainen » 16 Jan 2014 14:12

We don't usually just add "2.0". But if we don't know for sure (stereo vs surround, mono is another matter), it's probably best to add "2.0 stereo". You can always use Pro Logic, whether there's a flag or not. So adding "stereo" is not really wrong.
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Re: Dinosaurus! & stereo/surround talk (R1 USA) ADDED

Postby Todd_Oberly » 18 Sep 2014 01:34


This discussion quickly leaped into sound formats over disk content, but I'm looking to buy either the Italian or German DVD shortly and am curious if anybody knows if the two featurettes

Mostri Venuti dal Passato / Monsters from the Past
Dinosaurus! Eine monströse Geschichte / Dinosaurus! A monstrous history

have any overlap, or if they're completely different content? The times are noticeably different, but both apparently have English audio.
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