You can use lame
with the --mp3input
option.
For example you can do a downsampling
of the mp3 quality, specifing the a new lower bitrate
using the -b
option. For example if your starting mp3 has a quality of 256kbs
you can lower it's bitrate to 128kbs
:
lame --mp3input -b 128 input.mp3 output.mp3
Depending from the input file bitrate, the output.mp3
file has lower quality and so a file size reduction.
From the lame
manuale page:
--mp3input
Assume the input file is a MP3 file. Useful for downsampling from one mp3 to another. As an example, it can be useful for streaming through an IceCast server.