This is a Heroku buildpack for using ffmpeg compiled with LAME.
To use this buildpack you'll first need to set heroku-buildpack-multi as your custom buildpack:
$ heroku config:add BUILDPACK_URL=https://github.com/heroku/heroku-buildpack-multi.git
From here you will need to create a .buildpacks file which contains (in order) the buildpacks you wish to run when you deploy:
$ cat .buildpacks
https://github.com/craftsmen/heroku-buildpack-ffmpeg-lame
https://github.com/heroku/heroku-buildpack-ruby
Deploy your app like usual:
$ git push heroku master
...
You can verify ffmpeg is available by running the following command:
$ heroku run "ffmpeg -version"