What does this audio stream means?

[vincy]

When i checked my video's info using mediainfo, it showed me it has 2 video streams..one is DTS 6 channels and the other one is AC3 2 channels..i understand that part..what i dont get is why the 1st audio stream's (DTS) bitrate shows: "2 605 Kbps / 1 510 Kbps" why the 1st audio stream alone has 2 different audio bitrates?? thank you

[yoda313]

I can't say for certain but it might be giving you a core read out.

1510 I believe is the max dts bitrate for STANDARD DEF audio - the stuff you'd have on a commercial dvd with dts.


I'm not sure if 2605 is for dts-ma or not. That is what is on a majority of bluray titles these days. I don't know why it would show core audio in addition to the main audio if that is indeed what you are reading.

Edit - there is a core sd file inside the high def audio so you can play it on legacy receivers via fiber optic - at least I'm nearly certain that is what is going on.

[Cornucopia]

Yeah, that's probably right. Didn't know MediaInfo could read those types, but GOOD!
The core is encapsulated differently, so it's not surprising that it would show 2 bitrates. Works that way with some other Enhanced-Compatible formats, too.

Scott

[vincy]

alright..thank you for the answers..i think i have an idea of what is that about..i have another question..how can i play the video with the 2 605 Kbps audio..or every time i play it, it will play in 1510 kbps audio?.. i know i can switch between 2 audio streams (the DTS and AC3) but how about the 2 different audio bitrates in DTS..the video is in m2ts format..i hope my question makes sense..thank you..

[El Heggunte]

You need a DTS-HD~aware decoder, if you want to hear the DTS-HD "extension".

LAV Audio plus Arcsoft's DTSdecoderDLL.dll should work fine.

[edDV]

A player with DTS-HD(MA) capability will send this only via HDMI. The audio receiver must be DTS-HD compatible as well.

If you send via optical/coax, the standard 1510 KHz DTS conversion will be sent.

[Cornucopia]

As I said before, it's an Enhanced-Compatible type of stream.

Think of this analogy: FM stereo radio.

You used to just receive FM mono signal, but when stereo came along they wanted to make the stereo signal be sent along the same bandwidth & spectrum and still have mono receivers work ok. So, since they knew that stereo L & R can be re-organized to be M + S (mono/mid/sum + side/difference), they decided to send the M signal just like they had alway done with FM mono. And luckily, since the difference signal required MUCH less bandwidth on its own, they just tacked it on as a sideband. Stereo receivers see both the M and the S signals, Mono receivers see just the M signal and everybody's cool.

So now, if you are in an area of weak stereo signal, it just drops back to mono instead of completely cutting out or switching to a different stream/channel/signal.

In the same way, if you have a core lossy signal like DTS, you can add the "remainder" lossless components (basically, the "difference" between a lossless signal and the lossy signal) as the enhanced/bonus stream. But it is NOT the main stream, the lossy stream is.
So, if you have a DTS-MA lossless receiver/decoder, it will see both streams (the main/lossy and the difference/losslessremainder) and recombine them into the lossless signal.
If you only have a regular DTS receiver/decoder, it will see only the core lossy DTS signal (doesn't know how to handle the remainder signal, so just ignores it).

With this in mind, it's clear that you can't just "switch" to the remainder signal instead of the main signal. You have a choice of Main or Enhanced (= Main + remainder/residual).

And from what you stated, it's clear that your current receiver is ONLY DTS-capable, so it is ignoring the residual part of the enhanced stream.

Scott

[vincy]

alright..thank you for all your answers..i appreciate it..you are all a big help