Bulk audio coverter

On my WordPress site, I have a mp3 folder with about 100,000 small mp3 22050 Hz sample rate files that need to be convert to 44100 Hz sample rate (still keeping it a mp3 file) just resizing it.

My issue is my current sample rate mp3 files don\'t play properly in Chrome, but when I resize them, they play correctly.

For example:
orginal file if played in the Chrome browser gets stoped short:

http://dev3.spellingclassroom.com/mp3test/petite.mp3

resized file plays correctly:

http://dev3.spellingclassroom.com/mp3test/petite1.mp3
This ONLY happens in the Chrome browser but I need to do a bulk resizing of the mp3 files to fix this.

Do you have a tool to do this?

THanks,

Debra