• ffmpeg
• sox
• imagemagick
• avconv

On OS X, you can:

brew install sox imagemagick libav libass ffmpeg

• virtualenv -p python3 venv, or pyvenv venv.
• source venv/bin/activate
• pip install -r requirements.txt

Caveats:

• You may want to use pip install -r requirements.txt --ignore-installed. See this issue
• Or, you may want to start fresh. pip install -r requirements.txt --ignore-installed --no-cache-dir
• Or, you may want to start fresh. pip3 install -r requirements.txt --ignore-installed --no-cache-dir

• http://project.initiumlab.com/news2video/case1/