The Departed [Blu-ray] PCM better than The Departed [HD DVD] TrueHD - Page 3 - High-Def Digest Forums
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  #21  
Old 02-13-2007, 02:59 PM
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Originally Posted by LembasBread View Post
Maybe it's just as simple as it being compressed whereas PCM is not. There is always the possibilty of losing any kind of info when compressing anything. That's just the nature of it.
Not really. The whole point in lossless compression is that while the bandwidth required for the content stream during storage or transport is reduced, the end result is bit-for-bit identical.

Dropouts can happen with any media, which is why error-correction wizardry has been in use since the days of CDs, only it has the potential to have a larger impact on compressed content than uncompressed.

If TrueHD really isn't lossless, or if the encoder/decoder isn't doing the job properly, that's a different story.
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  #22  
Old 02-13-2007, 03:00 PM
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Originally Posted by dobyblue View Post
The NIN disc is also a teenie weenie bit better PQ on Blu-ray than the HD DVD because of the higher bandwidth.
So I guess this means that no matter what both formats are the same.
Sometimes 1 gets a "Slightly" higher mark in one area then the other.

There isn't any revelation here for either format. Nobody wins!


BTW do you have a link for this review for both formats??
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  #23  
Old 02-13-2007, 03:01 PM
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Originally Posted by 1080p View Post
So I guess this means that no matter what both formats are the same.
Sometimes 1 gets a "Slightly" higher mark in one area then the other.

There isn't any revelation here for either format. Nobody wins!


BTW do you have a link for this review for both formats??
Which one the NIN disc? It's all here. http://halo22.nin.com/hdfaq.html
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  #24  
Old 02-13-2007, 03:02 PM
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Hi all,

New to the boards. Could someone answer a few questions for me about THD and PCM?

1. Does the PCM and TrueHD come directly from the studio master?
2. Is there any "tweaking" done to either before it reaches HD/BD?
3. Shouldn’t, in theory, PCM and TrueHD sound the same?

Thanks!

P.S. Thanks to Peter for all the reviews. You've been a big help and saved me quite a few dollars (Field of Dreams)!
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  #25  
Old 02-13-2007, 03:03 PM
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As far as audio sounding better, there are a number of variables. How was the audio connected was not specified. HDMI or Analog and was it using the same connection type for both players.

Technically TrueHD is lossless, so it decodes into the exact same PCM stream that was originally put in (hence lossless), so there should not be any difference in the actual PCM. Connection types used or some subtle differences in DAC used are more likely culprits for the extremely slight difference in audio quality.
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  #26  
Old 02-13-2007, 03:04 PM
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Originally Posted by dobyblue View Post
Which one the NIN disc? It's all here. http://halo22.nin.com/hdfaq.html
This is the review?

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Are there any video quality differences between the HD DVD and Blu-ray versions of Beside You In Time?

For all intents and purposes, no - the video will look every bit as good on either version. Technically speaking, the video quality of the Blu-ray version has a slight edge over the HD DVD: It was encoded at a slightly higher bit rate due to the Blu-ray spec's higher bandwidth capabilities for encoded video streams. However, this difference is nominal and would only be noticeable by a pair of well-trained eyes on an extremely expensive professional 1080P monitor.
But where is the actually review!
I haven't seen 1 review

Last edited by 1080p; 02-13-2007 at 03:08 PM.
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  #27  
Old 02-13-2007, 03:05 PM
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Originally Posted by Robot View Post
3. Shouldn’t, in theory, PCM and TrueHD sound the same?
TrueHD recreates exactly the same source PCM stream. They not only should be identical, they are identical.
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  #28  
Old 02-13-2007, 03:06 PM
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Originally Posted by Blurry View Post
TrueHD recreates exactly the same source PCM stream. They not only should be identical, they are identical.
Just to clarify: by "source" you mean the studio master?
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  #29  
Old 02-13-2007, 03:10 PM
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Quote:
Originally Posted by 1080p View Post
This is the review?



But where is the actually review!
I haven't seen 1 review
No review necessary. In the email that was sent to fans regarding the pending release of both formats there was a link to a detailed FAQ where it is stated that the Blu-ray version may have an ever-so-slightly better PQ because they will be using a slightly higher bitrate to encode the video.
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  #30  
Old 02-13-2007, 03:10 PM
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Originally Posted by Mal Reynolds View Post
Not really. The whole point in lossless compression is that while the bandwidth required for the content stream during storage or transport is reduced, the end result is bit-for-bit identical.

Dropouts can happen with any media, which is why error-correction wizardry has been in use since the days of CDs, only it has the potential to have a larger impact on compressed content than uncompressed.

If TrueHD really isn't lossless, or if the encoder/decoder isn't doing the job properly, that's a different story.
Either way, TrueHD has to be processed from the master which causes the possibility of discrepancies, which according to this site on at least one encode, there are. With PCM, it is much less likely to be tinkered with from the original master, so there's less of a chance that something will be introduced into the data through compression/processing that makes it sound different than the studio master.

Who knows what other TrueHD tracks are out there right now that aren't truly lossless? Batman Begins or Superman Returns maybe? Only time and Warner's inclusion of more PCM/TrueHD tracks will tell.
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