How to add external library to Homebrew ffmpeg install?

Question

I successfully installed ffmpeg through Homebrew. I want to add additional libraries/codecs.

FFmpeg can be hooked up with a number of external libraries to add support for more formats. None of them are used by default, their use has to be explicitly requested by passing the appropriate flags to ./configure

Can someone please explain how to 'hook up' an external library to ffmpeg? For example:

Go to http://www.twolame.org/ and follow the instructions for installing the library. Then pass --enable-libtwolame to configure to enable it

And there, at twolame the install instructions are:

./configure make make install

There's no configure file in the ffmpeg directory. Where should the external library (in this case twolame) be installed? Thank You!

Answer 1

brew has options you can set type brew options ffmpeg then you can do thing like brew install ffmpeg --with-fdk-aac.

But, there is no twolame option. You can modify the brew formula like so: https://stackoverflow.com/questions/3939651/how-to-modify-a-homebrew-formula