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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.

PÃdraig

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

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

Cheers,

John

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.
Best,

--
Fabien Gouyon, PhD
Senior Research Scientist, INESC Porto
Invited Assistant Professor, Engineering Faculty, University of Porto
http://www.inescporto.pt/~fgouyon
http://smc.inescporto.pt/





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

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