..."A series of shell-script powered droplets (OS X Snow Leopard, Lion, Mountain Lion) that will encode prores and other type of files supported by ffmpeg with predefined command line (edit shell script to change that with your favorite texteditor) to x264 or prores or vp8 or flac or .... (whatever is supported by ffmpeg)"
EnKoDeur-Mixeur (EKD) is an open source software which makes videos, pictures and audio post-production. It can be also used to convert videos in many formats. It is written in python and use the PyQt4 bindings.