How is one to know what external programs are available in PiCloud. They just state the FFMpeg is available in PiCloud, but I don't see any 'master list.'
Good question. We're just starting to venture outside of Python, so we don't have a master list of executables just yet. We do have a list for Python packages http://www.picloud.com/pyapi/packages/weblist/python/ which includes pyffmpeg. But, that list isn't pretty :)