Why the lack of Dolby TrueHD on most, again I say most, BD's? Why would a studio release a movie on both BD & HD DVD and only put Dolby TrueHD on the HD DVD?

Why the lack of Dolby TrueHD on most, again I say most, BD's? Why would a studio release a movie on both BD & HD DVD and only put Dolby TrueHD on the HD DVD?

which movie are you referring to?

no need for it on BDs when there's plenty of space to put Uncompressed PCM track on the movie at 4.6Mbps constant bitrate for 16-bit and 6.9Mbps for 24-bit. though we will likely see more titles with TrueHD starting from now, there is no need for it on BD's with uncompressed PCM audio.

what jkcheng said. Most movies on bluray have enough space for an uncompressed pcm track. Not need to incur extra overhead of decoding the trueHD track. For longer movies like, hopefully, Lord of the Rings : EE, a trueHD track would be beneficial to save a bit of space to maximize video quality and save some bandwidth.
So to answer your question, because BD doesn't need it for most releases. An Uncompressed pcm track is just as good.

Also, it wasn't until recently that any of the BD players supported this type of audio. Now all, but the original Samsung and Sony S300(which should receive the update soon)decode it.

An Uncompressed pcm track is just as good.

if anything it'd sound better :)

Thanks guys!!! I was under the impression that Dolby TrueHD was a step above uncompressed PCM. Thanks for clearing that up. So, are the 2 DTS formats considered an upgrade over uncompressed PCM? I know no players can decode DTS-HD Master yet, is it and regular DTS-HD considered an upgrade over the uncompressed PCM?

PCM - lossless and uncompressed
Dolby TrueHD - lossless and compressed
DTS-HD-MA - lossless and compressed
DTS-HD - lossy and compressed
DD+ - lossy and compressed

the 1st 3 should sound identical assuming they're from the same source

PCM - lossless and uncompressed
Dolby TrueHD - lossless and compressed
DTS-HD-MA - lossless and compressed
DTS-HD - lossy and compressed
DD+ - lossy and compressed

the 1st 3 should sound identical assuming they're from the same source

Thanks!

Thanks guys!!! I was under the impression that Dolby TrueHD was a step above uncompressed PCM. Thanks for clearing that up. So, are the 2 DTS formats considered an upgrade over uncompressed PCM? I know no players can decode DTS-HD Master yet, is it and regular DTS-HD considered an upgrade over the uncompressed PCM?

There is no upgrade "over uncompressed PCM... that is the native format of the audio.

Dolby TrueHD and DTS-HD MA just pack the uncompressed PCM data into a smaller file stream and decode in into a replica of the PCM data that was fed into the encoder... think of them as zip files of audio, with some extra benefits thrown in (i.e. 7.1 extensions, etc...)

if anything it'd sound better :)

How again? Both are lossless, one just takes less space.

Has there been any discussions of uncompressed 7.1 PCM? Its killing me to not use my entire system.

Compressed would save space and give equal quality but since its not mandatory there could be the case where not all players supported TrueHD. There are a couple 6.1 & 7.1 tracks out, FilmMaker probably knows of even more...

Has there been any discussions of uncompressed 7.1 PCM? Its killing me to not use my entire system.

I highly doubt with standard movie soundtracks being at 5.1 that 7.1 discrete will become the norm anytime soon. Some studios may remix high profile/high sales titles for a marketing reason, but I doubt 7.1 will be the standard.

I do think 7.1 PCM will be more widely used in the game industry which tends to push the technology limits.

The problem 7.1 has is that a lot of room can't easily accomodate two more surround speakers. It is fine if you have a dedicated HT/entertainment room, but when the WAF comes into the equation.... LOOK OUT :p

It is fine if you have a dedicated HT/entertainment room, but when the WAF comes into the equation.... LOOK OUT :p

Help a new guy out...whats WAF?

Help a new guy out...whats WAF?
WAF means "Wife Acceptance Factor". It is the biggest roadblock to home theater heaven.

Actually it was my wifes idea for me to make the dedicated home theater in our house, I wanted to put the money towards an inground pool....

Actually it was my wifes idea for me to make the dedicated home theater in our house, I wanted to put the money towards an inground pool....

lucky you. though i'm not married right now and probably wouldn't marry someone that won't let me set up a home theater.

How again? Both are lossless, one just takes less space.

I'm going to take a crack at this answer. Both are lossless, however one is compressed one is not. There should not be any difference between the two types of soundtracks since all of the information is there.

However, if the processing (decoding) of the compressed soundtrack suffers in any way, there could be a perceived difference and or slight differences in reproduction between the two.

If everything works out the way it's suppose to, then there should be no difference at all.

Thanks for the explanation of the WAF. I've got a great one here...loves the Home Theater! I'm also into cars too and she's into that with me. I guess I just got real lucky in that department!

How again? Both are lossless, one just takes less space.

i think some of the compressed lossless have been 20 and 24bit while i think all pcm have been 16bit.

down note, i found that the super high bitrate AVC titles plus trueHD makes my PC skips frames like crazy, either alone is ok, although a few bluray, top bitrate titels have a skip here or there een with pcm. arghh. thought my not so old dual core would handle any hi-def format....

i think some of the compressed lossless have been 20 and 24bit while i think all pcm have been 16bit.There have been several 48hz/24-bit PCM tracks (both POTC, for example), as well as one confirmed 96/24 ("Chris Botti") title. I think "Chronos" (already released) and "Nature's Journey" (announced) are also supposed to be 96/24.