http://www.mp3load.ws/mp3-bit-rate-converter-batch/

Where can I find a batch mp3 converter that can compress my mp3s to a smaller quality?
I’m looking for a good free mp3 converter that can batch compress or shrink the bit rate of my mp3s. I have some songs (in mp3 and m4a) that are at 320kbps, which is great but I don’t need that much quality. I would love to shrink them down to something more reasonable, like 192kbps or something.
Thanks!
Yes!
A great program you can use is MediaCoder.
Its free and its open source!
Link: http://mediacoder.sourceforge.net/
It con compress your pre-existing MP3 files using LAME MP3 encoder using VBR, CBR or ABR. I recommend compressing them using VBR because it keeps the original’s quality but greatly decreases size.
Hope this helps!