Check bitrate of MP3 and audio files quickly
You can quickly get the bitrate of any MP3 or audio file from the command line by typing the following command:
afinfo filename |grep "bit rate" The command will report back something like:
bit rate: 320000 bits per second
The afinfo command is included in Mac OS X and without the attached grep command will report back extended information on audio files.
If you don’t like working in the command line, you can also get this information from iTunes.