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Re: AAC Constant Bit Rate coding

To set the bitrate, you may want to try:

ffmpeg -i input.wav -b:a 128k output.m4a

ffmpeg will auto-select whichever aac encoder is available when the output file has the extension m4a.


On 15/11/2011 15:44, John O'Connell wrote:

You could try ffmpeg: www.ffmpeg.org

Open source and handles pretty much anything you throw at it.

This line should convert a wav to aac.

ffmpeg -i file.wav -ab 128k -acodec libfaac test.mp4

It seems to ignore the audio bit-rate flag though (-ab 128k) - perhaps for reasons mentioned previously

This is what I get inside test.mp4: Audio: aac, 44100 Hz, stereo, s16, 141 kb/s



2011/11/15 Warren Bakay <warren@xxxxxxxx>
I use xld to encode to aac. It uses core audio to do the encoding.

On Tue, Nov 15, 2011 at 1:07 PM, fabien gouyon <fgouyon@xxxxxxxxxxxxx> wrote:
Dear list,

Could somebody recommend a free software, or even better some
open-source code, for converting audio from WAV to AAC with *constant*
bit rate (and not variable bit rate).

Any help would be much appreciated.

Fabien Gouyon, PhD
Senior Research Scientist, INESC Porto
Invited Assistant Professor, Engineering Faculty, University of Porto

PÃdraig Kitterick
Post-Doctoral Research Fellow
Department of Psychology
University of York
York YO10 5DD

Tel:   +44 (0) 1904 32 2911
Email: p.kitterick@xxxxxxxxxxxxxxxx
Web:   http://psych.york.ac.uk/aphhc