Save the following file in your project as `bin/post_compile` and after slug compilation it will be downloaded and a binary placed in a `vendor/ffmpeg` folder in your project root. Invoke FFMPEG as `/app/vendor/ffmpeg/ffmpeg -h`

ffmpeg.sh

#!/bin/bash

current=`pwd`
filename=ffmpeg.static.64bit.2013-08-15.tar.gz
url=http://ffmpeg.gusari.org/static/64bit/$filename

source $BIN_DIR/utils

puts-step "Installing FFMPEG"

# Download FFMPEG if not downladed yet
if [ ! -d $CACHE_DIR/ffmpeg ]; then
    mkdir -p $CACHE_DIR/ffmpeg
    cd $CACHE_DIR/ffmpeg 

    echo "Downloading FFMPEG ..." | indent
    curl -O $url >/dev/null 2>&1

    echo "Unpacking FFMPEG ..." | indent
    tar -xf $filename

    rm $filename
else
    echo "Already downloaded FFMPEG ..." | indent
fi


echo "Installing FFMPEG ..." | indent

if [ ! -d $BUILD_DIR/vendor/ffmpeg ]; then
    mkdir -p $BUILD_DIR/vendor/ffmpeg
fi

if [ ! -f $BUILD_DIR/vendor/ffmpeg/ffmpeg ]; then 
    cp -r $CACHE_DIR/ffmpeg/* $BUILD_DIR/vendor/ffmpeg/
fi
    
cd $current