Hello everyone
I have some question

1. How to encoding 5.1 AACplus audio file?
I have 6 wav files(front LR, Rear LR, center, LFE) and used Nero Burning Rom
but It outputs a file, a wave file to a mp4 file not 6 audio files to a mp4(or aac)
Is there any program to satisfy my desire

2. To compare AC3 with AAC plus what bitrates should I choose?
and what kinds of audio profile should I choose? HE-AAC, LC or something else?
I want to compare AAC plus audio file with AC3 audio file
My friend said to me that AC3 is superior to AAC plus,
He has a AC3 audio file(5.1ch, 320kbps, 16bits, 44.1khz )


3. What is the most effective audio format in quality and file size ?
Is it best choice to select AAC plus?
To satisfying your opinion What kinds of program, option, profile etc should I use?

What is your opinion? Please tell me the reasonable choice.

Unfortunately, Nero is still the only publicly available HE AAC encoder, and it won't support inputting several wav streams to create a single AAC stream. You need to merge the wavs together into a 5.1 wav stream before feeding the file to nero AACenc.



Absurd.



Depends on the bitrate you're after. For low bitrates, AACplus is indeed the best. For mid-high bitrates (and for transparency), you should look at Vorbis, iTunes AAC and Musepack.

I'm pleased to see your sincere answers
and It's a great help to me

after reading your answers another questions has just occurred ^^;;

- I've seen a wav merged into multi channel but not seen such a software
Can you recommend a program or more to me?
- Is there any multichannel encoder that uses AAC plus format and is not publicly available

2.Does converting a 5.1ch wav to a AAC plus mean that
cross-correlation is effective among channels?

In most of the cases, it is hard to know what is not publically available....

For merging the waves into one multi-channel .wav I recommend BeSweet (I never used it for that purpose but I think it can do it...)

http://www.dspguru.doom9.net/

Use latest beta & GUI !!!

If you have 6 wav/aiff files then you can use QT Pro to generate 5.1 AAC. Although remember for QT:

1. No HE-AAC support. So if you do 64 kbps/channel you get 64*6 = 384 kbps LC-AAC 5.1 file
2. QT does not allow 5.1 AAC in mp4 container ( ya I know, it suck!) . So your final file will be .mov

Apart from that, I have backed up few of my DVDs to H264/5.1AAC like this ( final movie is in .mov container). I do not have very high end speakers to test them on, but so far as sound is concern I think its pretty much the same as original AC3.

Nice, didn't even think of trying to make a multichannel QT AAC file before this.

You need BeLight find him on www.corecodec.org, BeLight can handle 6 wav files and convert it to one 6ch wav/ac3/aac/ogg. So if you wanna aac i only recommend you Coding Tehnologies becouse now best encoder in 6ch encoding instead nero 6/7 which is very terrible and very articfatible. For bitrates you can use everythig form 96-200kbs and 96 is very good quality with no artifacts and good for 1CD rips, so you don't need high bitrates for good quality like iTunes or Nero, FAAC

So what bitrate should be used for converting AC3 -> AAC 5.1 ? When I use QT pro to convert with 64 kbps/channel (QT has only option to make 5.1 by specifying per channel bitrate, CBR or VBR). I know QT is not HE-AAC, so thats why I did not go very low bitrate. But this does not help me save much space. AC3 is already 448 kbps and I get aac 384 kbps. So not much saving there.

What would be a good bitrate ( per channel) for HE-AAC 5.1 and LC-AAC 5.1 ?

I'd use 40-48kbps/chan for LC-AAC and 24-32kbps/chan for HE-AAC.

With Coding Tehnologies can be used 16kbs per channel so 16*6=96kbs for bitrate and you get good quality without any artefacts. Should try is true. I think how CT produce extra quality at low rates, how than Nero's new encoder with 2pass mode, i think can we use 64 for 6 ch encoding 10.6kbs per channel.

For LC-AAC i think is good using 250-384kbs but i newer tested so maybe i am wrong.