As per the many PCM tracks I find, it seems to be that 16/48 5.1 is 4.6 Mb.

Now with the DTS MA tracks I find it seems that they hover around 3.2 or so. BUT... it spikes up over 4.6 to 6.2 or higher. Now I have checked the thread with the disc specs and these tracks are also 16/48.

How can this be?

Inaccurate bitrate meter could be one of the reason.

Inaccurate disc specs could be another.

PCM - Linear/Uncompressed - Constant Bit Rate

48,000 (samples per second) x 16 (bits per sample) x 6 (5.1 channels) = 4.6 Mbps
48,000 (samples per second) x 24 (bits per sample) x 6 (5.1 channels) = 6.9 Mbps
48,000 (samples per second) x 16 (bits per sample) x 8 (5.1 channels) = 6.1 Mbps
96,000 (samples per second) x 24 (bits per sample) x 6 (5.1 channels) = 13.82 Mbps

DTS-HD MA / Dolby TrueHD (MLP) - Variable bit rate

Dolby TrueHD (48 Khz/5.1/16-bit) - 640 Kbps ~ 3 Mbps
Dolby TrueHD (48 Khz/5.1/20-bit) - 1.5 Mbps ~ 4 Mbps
Dolby TrueHD (48 Khz/5.1/24-bit) - 3 ~ 6 Mbps

Bit rates can vary depending upon the bit depth and whether the bits are supplied when the channel is momentarily passive.

Some other member with proficient knowledge will be able to explain this in detail.

Thanks for the info. Like I said tho it is only on DTS MA that I see this. I'm not above believing that the bit meter is wildly inaccurate but the fact that it is only on one and not the other ( True HD).

Again I do not believe these are 24 bit tracks. I think there is only a handful of those at the moment.

Thanks for the info. Like I said tho it is only on DTS MA that I see this. I'm not above believing that the bit meter is wildly inaccurate but the fact that it is only on one and not the other ( True HD).

Again I do not believe these are 24 bit tracks. I think there is only a handful of those at the moment.

Why do you believe thats its just a handful of 24bit tracks?

What movie title are we talking about?

Does the DTS-MA 1.5 Mbps legacy core also add to the overhead or is it reproduced (encoded on the fly) in software from the lossless info?

Does the DTS-MA 1.5 Mbps legacy core also add to the overhead or is it reproduced (encoded on the fly) in software from the lossless info?

I guess they make a lossless encode first before they make a lossy encode.

That could give us the benefit that under many cases(scenes) the lossy track = lossless.

But im not sure if DTS encoders works this way.

I guess they make a lossless encode first before they make a lossy encode.

That could give us the benefit that under many cases(scenes) the lossy track = lossless.

But im not sure if DTS encoders works this way.

What I'm asking is DTS-MA contains a 1.5 Mbps lossy core (for backwards compatibility). Is this core added to the total data rate of DTS-MA (so DTS-MA would be 1.5 Mbps LESS without the core) or is it encoded from the lossless DTS-MA data stream (which would require a lot of processing power) and would make the DTS-MA stream 1.5 Mbps less?

What I'm asking is DTS-MA contains a lossy core (for backwards compatibility). Is this core added to the total data rate of MA (so DTS-MA would be 1.5 Mbps LESS without the core) or is it encoded from the lossless MA data stream (which would require a lot of processing power) which would make the DTS-MA stream 1.5 Mbps less?

As I understand DTS(core) + Extra data = DTS-HD MA

So the DTS-HD MA needs the core first so it can compare what additional data is needed to build up a lossless encode from the core.

So the core should be included in the data.

Street Kings is one of them.

Street Kings is one of them.

I see no reason why Street King wouldnt have 24bit audio, its sure would have a 24bit master.

16/48 shouldn't peak to 6Mbit, even 24/48 peaks usually below 5Mbit.

24/48 can peak at 6Mbit, but only if the source is very, very noisy.


Andrew

24/48 can peak at 6Mbit, but only if the source is very, very noisy.


Or if the bitrate meter isnt accurate.

I see no reason why Street King wouldnt have 24bit audio, its sure would have a 24bit master.

Most lists I see have most movies still at 16 bit. Sure there are some 24 bit, but the majority that I have looked at are 16 bit. Why do most Disney and Sony titles use 16 over 24 bit?

Most lists I see have most movies still at 16 bit. Sure there are some 24 bit, but the majority that I have looked at are 16 bit. Why do most Disney and Sony titles use 16 over 24 bit?

What lists?

I thought it was Warner who used 16bit tracks.

Some PCM releases on Disney and Sony used 16bits, and thats not so strange since 24bit PCM take alot of space and should sound the same as 16bit in the end.

Disney used 16bit track on some european releases and at the same time gave the US releases 24bit.

http://www.avsforum.com/avs-vb/showthread.php?t=760714

"Modern" movies has bigger chance of having 24bit masters, since most movies should get 24bit masters today.

I have no idea what movies that has 16bit masters, but a recent movie like Street kings should have 24bit master.

European movies sometimes has to downconvert since they use US videoencodes and wants space for more tracks, without reencode the video.

Like I said according to the link above, and seeing most PCM tracks at 4.6, it leads me to belive most are 16 bit.

Like I said according to the link above, and seeing most PCM tracks at 4.6, it leads me to belive most are 16 bit.

The difference is that PCM take alot of space. So its practical sometimes to downconvert the track to 16bits. Not that the master is 16bit just because the PCM track is 16bit.


2 hour movie

16bit = 4,1 GB
24bit = 6,2 GB

I also didn't know about audio bitrates before. But after reading some postings here, mmmm I do quite understand...Thanks.:)