Cloning this repository:

git clone git://gitorious.org/~emmellst/ffmpeg/emmellsts-ffmpeg-mt.git emmellsts-ffmpeg-mt
cd emmellsts-ffmpeg-mt

Add this repository as a remote to an existing local repository:

git remote add emmellsts-ffmpeg-mt git://gitorious.org/~emmellst/ffmpeg/emmellsts-ffmpeg-mt.git
git fetch emmellsts-ffmpeg-mt
git checkout -b my-local-tracking-branch emmellsts-ffmpeg-mt/master_or_other_branch