MP3 is notoriously bad for low Bitrate audio. Look at Opus and/or Speex encoding.
On 12 September 2013 11:35, Long Wind <longwind2009@gmail.com> wrote:
I use the command below:
lame --mp3input --preset 30 input.mp3 output.mp3
Thank you!
On 9/11/13, Patrick Wiseman <pwiseman@gmail.com> wrote:
> On Wed, Sep 11, 2013 at 4:48 PM, Long Wind <longwind2009@gmail.com> wrote:
>> the mp3 file is too big, 128kbps
>> I want to reduce it to 40kbps
>>
>> Thanks!
>
> I use lame to reduce stereo mp3 files to mono; it (as one might
> expect) halves the filesize.
>
> Patrick