Normal channel ordering to make 5.1 AAC

[AlexeyS]

Normal for OGG and AC3:
FL.wav
C.wav
FR.wav
SL.wav
SR.wav
LFE.wav

Normal for 6chwav/6chaiff:
FL.wav
FR.wav
C.wav
LFE.wav
SL.wav
SR.wav

What channel ordering is normal for AAC (making with BeLight, BeSweet)?

[Kurtnoise]

C,FL,FR,SL,SR,LFE

[AlexeyS]

Originally posted by Kurtnoise13
C,FL,FR,SL,SR,LFE
Thanks. :)

[AlexeyS]

Ok, I've decoded Dolby Digital 5.1 audio of Terminator 2 to six waves with BeLight. The file is 448 Kbps. The setting was:
Azid - Dynamic Compression :: Normal
LFE to LR channels -3db.
Normalize to 100%.

Then I've streched every wave with Cool Edit Pro 2.1.

Then I've encoded waves to AAC 5.1 with BeLight. The file is 173 Kbps. Settings was:
Dynamic Compression :: Normal
HE-AAC
High Quality
VBR :: Streaming quality

The AAC 5.1 has less volume than Dolby Digital original. And I think the channels ordering are not normal (AAC sounds different).


What I did wrong? :confused:

[AlexeyS]

Guys, please help. I really want to learn how to do encoding correctly, but I'm noob with 5.1 AAC and BeLight/BeSweet. :(

[bond]

Originally posted by AlexeyS
The AAC 5.1 has less volume than Dolby Digital original. :search: multichannel ac3 files from dvd have a low volume as the dvd players do some gain during playback. you have to apply gain during the conversion from ac3

[AlexeyS]

Originally posted by bond
:search: multichannel ac3 files from dvd have a low volume as the dvd players do some gain during playback. you have to apply gain during the conversion from ac3
In BeLight I've found Mode: What I should set? PreGain or PostGain?

Are my other settings right?

PS: I've searched forum already few days and read interesting discussions, but I didn't find discussion of such problem...

[bond]

i always use normalize 90% and also dialog normalization

[AlexeyS]

Originally posted by bond
i always use normalize 90% and also dialog normalization
You do this when you convert AC3 to six waves? Or when you convert six waves to 5.1 AAC?

Also, when you do Gain. And what do you do - PreGain or PostGain.

What about Azid Dynamic Compression (when you convert from AC3 and when you convert to 5.1 AAC)?

What about LFE to LR - 3db? Should I turn this setting on? When (when I convert to six waves or when I convert to AAC)?

Should I turn on Output Mode (mono, stereo, dpl, dplii)?

[SeeMoreDigital]

Originally posted by AlexeyS
You do this when you convert AC3 to six waves? Or when you convert six waves to 5.1 AAC?

Also, when you do Gain. And what do you do - PreGain or PostGain.

What about Azid Dynamic Compression (when you convert from AC3 and when you convert to 5.1 AAC)? You might want to give Foobar2000 a try... as it's able convert 6Ch AC3 directly to 6Ch AAC (LC or HE). Plus it offers various third party tools!


Cheers

[bond]

Originally posted by AlexeyS
You do this when you convert AC3 to six waves? Or when you convert six waves to 5.1 AAC? when doing ac3 -> wav

Also, when you do Gain. And what do you do - PreGain or PostGain. none of the two, i use normalize 90%

What about Azid Dynamic Compression (when you convert from AC3 and when you convert to 5.1 AAC)?

What about LFE to LR - 3db? Should I turn this setting on? When (when I convert to six waves or when I convert to AAC)?

Should I turn on Output Mode (mono, stereo, dpl, dplii)? :search:
this has been discussed that often already, i think there are even doom9 guides on this process

btw azid is a ac3 decoder, it isnt used when doing wav->aac

[AlexeyS]

this has been discussed that often already, i think there are even doom9 guides on this process[/B]
I've found guide about AACMachine.
So, my last question is about "Output Mode". Should I use this? What settings will be right for 5.1 AC3? dpl or dplii?

[AlexeyS]

I still get 5.1 AAC with very low volume. :(

[bond]

aacmachine uses the psytel aac encoder, which doesnt produce a correct output for multichannel streams (wrong channel order)

if you dont find the setting normalize 90% you can also set pregain to 10db

[AlexeyS]

if you dont find the setting normalize 90% you can also set pregain to 10db [/B]
Is PreGain better than PostGain?

[bond]

for aac yes

[AlexeyS]

Ok. Thanks, volume si better now.

Could you answer for another questions?
If I use PreGain - do I need check "Nomralize" checkbox (BeLight)? Is PreGain is the same as Normalize?

Also, how I can set pregain to 5db or 10 db (for example) with BeLight. I can't find such option... Should I enter something to command line to use this option?

[Kurtnoise]

Originally posted by AlexeyS
Ok. Thanks, volume si better now.

Could you answer for another questions?
If I use PreGain - do I need check "Nomralize" checkbox (BeLight)? Is PreGain is the same as Normalize?
Please...:search: Brother John has made a command lines reference guide. You could find your answer in this paper.

Originally posted by AlexeyS
Also, how I can set pregain to 5db or 10 db (for example) with BeLight. I can't find such option... Should I enter something to command line to use this option?
No...not for the moment.

[bond]

Originally posted by AlexeyS
If I use PreGain - do I need check "Nomralize" checkbox (BeLight)? Is PreGain is the same as Normalize?pregain raises the volume by a fixed amount (eg 10db), normalize scans the file and than raises the volume according to what it thinks is the best

at least thats how i understood it :D

[AlexeyS]

Last question (maybe little stupid question). Just to be sure - is BeSweet GUI 0.7 uses same channel order as BeLight?

[SeeMoreDigital]

AlexeyS,

Converting 6Ch AC3 to 6Ch AAC (or even 2Ch AAC) is really very successful using Foobar2000.

If you want to give it a try PM me and I'll be happy to provide you some installation instructions and plug-ins.


Cheers

[Kurtnoise]

Originally posted by AlexeyS
Last question (maybe little stupid question). Just to be sure - is BeSweet GUI 0.7 uses same channel order as BeLight?
Yes.

btw, BeLight has some presets for AAC transcoding. Why don't you try them ?

[AlexeyS]

btw, BeLight has some presets for AAC transcoding. Why don't you try them ? [/B]
Never saw any presets. :confused:
Do you mean "Normal", "Streaming" etc? I use them. :)