* If you're on a Mac, brew install gstreamer-tools or utils or something like
  that, as well as the good, bad and ugly plugins. All of this should be
  version 1.0 -- you need gst-inspect-1.0 and gst-launch-1.0

* Look at the properties you can tweak on the encoder with:

  gst-inspect-1.0 lamemp3enc

* You can do the encoding using:

  gst-launch-1.0 filesrc location=path/to/infile ! \
                 decodebin \
                 lampemp3enc quality=2.0 <other options from gst-inspect-1.0> \
                 id3v2mux \
                 filesink location=path/to/outfile