[SurroundSound] Re: DTS vs AAC

OK, found out why the DTS with pass-thru option is smaller-

Turns out the video frame rate affects the audio bit rate too...

So one mystery solved, however- when I keep same frame rate as original, I get an actually higher bit-rate for the audio-

About X3 from the original. File size stays the same as original DVD DTS, however.

On Friday, December 7, 2012 9:27:41 PM UTC+2, flytomars wrote:

In the continuing saga of my car surround upgrade, I have found a Kenwood DVD player that can play DTS from DVD or MP4 via USB.

I checked the audio formats it supports and it might supportsurround  AAC via the MP4 (I will confirm it in a few days).

In the meantime I was wondering about this format- how does it compare to DTS encoding?

I am using handbrake (great software) to convert my DVDs streight to MP4, and I use sample rate 48 and bitrate of 768 for the AAC, with 6 channel faac encoding.

I think it comes out to 128 bits per channel, and since I read this format should be superior to MP3 in the same bitrate, this should be acceptable?

How does this compare to the regular (not 24/96) DTS on DVDs?

Also, a strange phenomenon I noticed- when I convert DTS DVD to MP4 with DTS passthru option (meaning soundtrack should stay the same), the file size is reduced to half even though the DTS portion of the file was about 90% (if I exclude the video data).

What is the reason for this?

When I compare file size, then an average album which on DVD the DTS portion took ~500 mega, the result MP4 AAC file is ~250 mega, and the DTS pass-thru MP4 is ~210 mega.

If indeed the DTS stays intact as before and just gets more data compression, then it seems the AAC carries more information?

Anyone knows how (at least on paper) these 2 formats compare? and what is the reason DTS pass-thru shrinks the size?

 

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