Lossless audio vs DTS-MA and True HD - Blu-ray Forum

jeremy_williams · 01-10-2008, 08:02 PM

Doesn't it make sense that lossless audio would sound better than DTS-MA or True HD since both of those are forms of compression?

nhaase · 01-10-2008, 08:06 PM

Please use the search function and check the sticky threads. This has been extensively discussed. As you will see, MA and TrueHD are lossless compression. They do not throw out data, they work like a zip file.

jeremy_williams · 01-10-2008, 08:06 PM

I see. So that explains the reason for the decoder. Got it.

crackinhedz · 01-10-2008, 08:07 PM

Quote:

Originally Posted by jeremy_williams

Doesn't it make sense that lossless audio would sound better than DTS-MA or True HD since both of those are forms of compression?

All 3 are Lossless. Dolby TrueHD and Dts-HD Master are 'encoded' PCM audio...when 'decoded' its simply converted back into PCM...so in theory they are all the same, just use different techniques to get there.

julyccc · 01-10-2008, 08:40 PM

Quote:

Originally Posted by crackinhedz

All 3 are Lossless. Dolby TrueHD and Dts-HD Master are 'encoded' PCM audio...when 'decoded' its simply converted back into PCM...so in theory they are all the same, just use different techniques to get there.

+1

Clark Kent · 01-10-2008, 10:07 PM

The only caveat is if DialNorm is enabled on the Dolby TrueHD track. Then the TrueHD track after being decoded is not bit for bit identical to the original PCM master. I've seen estimates that DialNorm enabled loses as much as 1 bit of resolution if say the master is originally 24 bit.

There is nothing the end user can do about this. Warner enables DialNorm on all of their Dolby TrueHD soundtracks. Sony rightfully doesn't use DialNorm on its TrueHD soundtracks thanks to the good work of our Sony insider Paidgeek. It's why I wish studios would use PCM soundtracks or DTS-HD MA soundtracks all the time.

01-10-2008, 08:02 PM	#1
jeremy_williams Member Member since:Apr 2007 Location:San Francisco Bay Area Blu-ray reviews:1	Lossless audio vs DTS-MA and True HD Doesn't it make sense that lossless audio would sound better than DTS-MA or True HD since both of those are forms of compression?

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01-10-2008, 08:06 PM	#2
nhaase Special Member Member since:Mar 2007 Trading Score:2	Please use the search function and check the sticky threads. This has been extensively discussed. As you will see, MA and TrueHD are lossless compression. They do not throw out data, they work like a zip file.

01-10-2008, 10:07 PM	#6
Clark Kent Blu-ray Prince Top contributor Member since:Oct 2007 Location:Metropolis Blu-ray reviews:2 Trading Score:184	The only caveat is if DialNorm is enabled on the Dolby TrueHD track. Then the TrueHD track after being decoded is not bit for bit identical to the original PCM master. I've seen estimates that DialNorm enabled loses as much as 1 bit of resolution if say the master is originally 24 bit. There is nothing the end user can do about this. Warner enables DialNorm on all of their Dolby TrueHD soundtracks. Sony rightfully doesn't use DialNorm on its TrueHD soundtracks thanks to the good work of our Sony insider Paidgeek. It's why I wish studios would use PCM soundtracks or DTS-HD MA soundtracks all the time.

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