URL: http://github.com/typemytype/drawBotRoboFontExtension/issues/7
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DrawBot.roboFontExt/lib/drawBot/context/mp4Context.py", line 45, in _writeDataToFile
File "/Users/sarahtilley/Library/Application Support/RoboFont/plugins/DrawBot.roboFontExt/lib/drawBot/context/tools/mp4Tools.py", line 23, in generateMP4
File "/Users/sarahtilley/Library/Application Support/RoboFont/plugins/DrawBot.roboFontExt/lib/drawBot/misc.py", line 317, in executeExternalProcess
RuntimeError: 'ffmpeg' failed with error code 1