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Is Dolby True HD 7.1 or 5.1 with Blu Ray?

post #1 of 21
Thread Starter 
Just wanted to be clear on this point....
post #2 of 21
The Blu-ray format supports TrueHD in up to 7.1 channels, but the vast majority of TrueHD tracks are in 5.1.

Aside from a Dolby demonstration disc, I'm not aware of a BD that has a 7.1 TrueHD encode. The recently released Shinobi: Heart Under Blade does have a 6.1 TrueHD track. Anyway, the format does support 7.1 TrueHD.
post #3 of 21
post #4 of 21
The Blu-ray spec supports up to 8 audio channels, irrespective of format/codec (PCM, TrueHD, DTS-HD MA, etc).

TrueHD is lossless compression technology that packs the audio data more efficiently in order to reduce storage space and transmission bandwidth, As such, it has nothing to do with the number of channels in a soundtrack. For example: if Casablanca' were to be released on Blu-ray using TrueHD, it would still be one (mono) channel. At the opposite end, there are examples of 6.1 and 7.1 TrueHD soundtracks (mentioned above).

Film makers decide how many channels are in the soundtrack. TrueHD is just used to losslessly reduce the file size.

Sanjay
post #5 of 21
http://www.avsforum.com/avs-vb/showthread.php?t=1031386

7.1 lossless titles:

RAMBO
3:10 To Yuma
Tyler Perry's Daddy's Little Girls
Delta Farce
Good Luck Chuck
Ultimate Avengers Collection
National Lampoon's Van Wilder
Waiting...
Weeds Season 2
The Condemned
House of 1000 Corpses
Hairspray
Doctor Strange: The Sorcerer Supreme
The Golden Compass
Mr Woodcock
Oldboy
The Orphanage
Pan's Labyrinth
Rush Hour 3
Saw 4
Shoot Em Up
War
post #6 of 21
Quote:
Originally Posted by tamahome02000 View Post

7.1 lossless titles:

I don't think any of those are encoded in TrueHD (the topic of this thread).

Sanjay
post #7 of 21
Rambo is DTS-HD Master Audio 7.1.

So, what I am finding out is that if I use TrueHD on my Onkyo TX-SR606 while playing a BD on my Panasonic DMP-BD30 (TrueHD 5.1 soundtrack), I only get the 5.1 (two back speakers are cut out).

I have to switch the receiver to Dolby EX to enable the two back speakers.

Question: Does this mean I have to play a TrueHD (or DTS-HD) 7.1 soundtrack to get TrueHD (or DTS-HD) 7.1, correct?

This would be a bummer then waiting for more 7.1 tracks on BD.
post #8 of 21
Quote:
Originally Posted by tamahome02000 View Post

http://www.avsforum.com/avs-vb/showthread.php?t=1031386

7.1 lossless titles:

RAMBO
3:10 To Yuma
Tyler Perry's Daddy's Little Girls
Delta Farce
Good Luck Chuck
Ultimate Avengers Collection
National Lampoon's Van Wilder
Waiting...
Weeds Season 2
The Condemned
House of 1000 Corpses
Hairspray
Doctor Strange: The Sorcerer Supreme
The Golden Compass
Mr Woodcock
Oldboy
The Orphanage
Pan's Labyrinth
Rush Hour 3
Saw 4
Shoot Em Up
War

And those are all TrueHD???? NOT. Please read the original post.
post #9 of 21
Quote:
Originally Posted by fraginsteindod View Post

Rambo is DTS-HD Master Audio 7.1.

So, what I am finding out is that if I use TrueHD on my Onkyo TX-SR606 while playing a BD on my Panasonic DMP-BD30 (TrueHD 5.1 soundtrack), I only get the 5.1 (two back speakers are cut out).

I have to switch the receiver to Dolby EX to enable the two back speakers.

Question: Does this mean I have to play a TrueHD (or DTS-HD) 7.1 soundtrack to get TrueHD (or DTS-HD) 7.1, correct?

This would be a bummer then waiting for more 7.1 tracks on BD.

I don't understand what you are asking. Do you expect to get 7.1 from a 5.1 audio track? Does your Onkyo do DPL IIx?
post #10 of 21
Quote:
Originally Posted by townofturley View Post

I don't understand what you are asking. Do you expect to get 7.1 from a 5.1 audio track? Does your Onkyo do DPL IIx?

I will try to answer for the OP. Yes, reciever does DPL IIx. I think he is asking, if he sets the TRUE HD to DPL IIx, is he loosing something? ie..is it theoretically TRUE HD with matrixed back surrounds, or does it screw it up into something not even close? ie..is it better to leave it, or to use dplIIx for his 7.1 setup..

just my .02
post #11 of 21
Quote:
Originally Posted by mahicks View Post

I will try to answer for the OP. Yes, reciever does DPL IIx. I think he is asking, if he sets the TRUE HD to DPL IIx, is he loosing something? ie..is it theoretically TRUE HD with matrixed back surrounds, or does it screw it up into something not even close? ie..is it better to leave it, or to use dplIIx for his 7.1 setup..

just my .02

You got it. That's what I'm asking, am I losing quality for quantity? (But it still sounds great on DPL IIx at 7.1).
post #12 of 21
I have the same question, too!!!
post #13 of 21
I have been using DPLIIx for years to get a 7.1 soundfield from a 5.1 program. My suggestion is try it both ways, with and without. It's a personal preference, not a scientific fact of which is preferable.

There are very few 6.1/7.1 soundtracks on DVD, so using DPLIIx to get a 7.1 soundfield is going to be your usual way to take advantage of a 7.1 setup. I am not sure how common 7.1 is on Blu-ray, but it does not sound too common, so the same statement would seem to apply.

Not all receivers can apply DPLIIx to MCPM.
post #14 of 21
Quote:
Originally Posted by MichaelJHuman View Post

I have been using DPLIIx for years to get a 7.1 soundfield from a 5.1 program. My suggestion is try it both ways, with and without. It's a personal preference, not a scientific fact of which is preferable.

There are very few 6.1/7.1 soundtracks on DVD, so using DPLIIx to get a 7.1 soundfield is going to be your usual way to take advantage of a 7.1 setup. I am not sure how common 7.1 is on Blu-ray, but it does not sound too common, so the same statement would seem to apply.

Not all receivers can apply DPLIIx to MCPM.

Is DPLIIx the same as PLIIx for the Yamaha RX-V663?

I made the same mistake last night listening to Batman Begins. I was wondering why my back surrounds had no sound...till I noticed it was 5.1.
post #15 of 21
The Hong Kong release of Dragon Tiger Gate has a 7.1 Dolby TrueHD track.
post #16 of 21
Quote:
Originally Posted by jlangner View Post

Is DPLIIx the same as PLIIx for the Yamaha RX-V663?

Yes, in both cases it's Dolby Pro Logic IIx.

Sanjay
post #17 of 21
Quote:
Originally Posted by fraginsteindod View Post

You got it. That's what I'm asking, am I losing quality for quantity? (But it still sounds great on DPL IIx at 7.1).

Anyone have the answer?? (with regard to lossless to 7.1 and losing quality for quantity)
post #18 of 21
Quote:
Originally Posted by petegtsv10 View Post

Anyone have the answer?? (with regard to lossless to 7.1 and losing quality for quantity)

I can tell you I have the same receiver as the OP that originally asked the question. I think the Onkyo does a great job of simply sampling some of the information from the surround channels and puts it into the back surround channels. In our case, I personally think it is better for movies, but that is just my opinion and only based on my limited use with the receiver and quite a few discs. With another receiver, YMMV. Long story short....you don't loose any quality from the original 5 channels, you just "create" 2 more..

Also, I would like to add that when you do have this receiver setup to "turn" HD codecs into 7.1 PLIIx, it automatically turns off PLIIX when a SEVEN channel source is detected. This allows us to "set it and forget it" while still allowing all 7.1 discrete tracks to played only in original format, yet "creating" us a 7.1 automatically when a less than 7 channel track is played.
post #19 of 21
"you don't loose any quality from the original 5 channels, you just "create" 2 more.."

lose
post #20 of 21
Quote:
Originally Posted by Lonely Surfer View Post

"you don't loose any quality from the original 5 channels, you just "create" 2 more.."

lose


LOL...Thanks. I do that quite often, but I try not to lose sleep over it :-)

Guess I have a loose way with werds..
post #21 of 21
Thanks for the answers guys, now I can sleep again LOL!
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