How have an 576K AAC FILE

Audacity Help Forum Windows
1

Hi,

I have a little problem.
I have an file that I want to modify with audacity (AAC – 576K – 48KHZ – stereo) but when i create my personnal exporting profile (File, export, exporting audio…) with the original configuration (ADTS / AAC) audacity create a more compressed file (130KB/s approxmitively) and not my 576KB/S file.

In the attached file, my personnal profile.
https://zupimages.net/up/22/52/go78.png

Do you have a solution?
I’m using Audacity 2.3.2 on Windows 10

Have a nice day :smiley:

2

You may need to use iTunes for that. Most AAC encoders only go up to 320 kbps. I’ve not checked (I don’t use iTunes), but I’m guessing that iTunes will support higher bit rates.

Alternatively, it may be worth considering FLAC format. The file size is likely to be similar and it is a lossless format.

3

It doesn’t
itunes bitrates.png
UPDATE: Oops I see that is the iTunes AAC encoder - but their MP3 encoder also maxes out at 320kbps

Peter

4

thanks for your help.

One day audacity will support the 576 KB/S AAC?

5

Audacity uses “codecs” (encoder / decoder libraries) to import / export different formats. Audacity is therefore limited to the formats supported by the codecs. I haven’t found any codec that supports encoding 578 kbps stereo. Where did your original file come from?

6

thanks for this answer, i already said for the library.

Have a nice day :smiley:

7

There are some special-purpose applications such as [u]MP3 Direct Cut[/u] that can do basic-limited editing without decompressing the file. (MP3 Direct Cut works with AAC but I don’t know if it will work with your particular file.)

As a practical matter it’s unlikely that you’ll hear any difference at 320kbps (or lower) in a proper-scientific blind listening test. AAC at “normal” bitrates often sounds identical to the uncompressed original.

…At some point it’s silly to use high-bitrate lossy compression when you can use lossless FLAC and get a bitrate around 700 or 800kbps (assuming 16-bits and 44.1 or 48kHz).

8

FLAC create an real biger file (x2 or x3 than the original) (with 8 for compression and 16 bits for setup on audacity)

But i have selected 320 and yes it’s good.

Thanks for your help.