Setting up Remix: en-ffmpeg not found

I am currently attempting to get the Echo Nest Remix API to work in python, but I am getting the following error:

RuntimeError
en-ffmpeg not found! Please make sure ffmpeg is installed and create a link as follows:
sudo ln -s `which ffmpeg` /usr/local/bin/en-ffmpeg");

/usr/local/bin is on my system path, and en-ffmpeg exists in there. I tried manually copying in the Mac version of en-ffmpeg from the Remix source (external/en-ffmpeg/mac/en-ffmpeg), as well as compiling ffmpeg myself, and copying it to /usr/local/bin/en-ffmpeg.

Does anyone know why I could be getting this error?