It seems that the good ‘ol QuickTime is not cutting the mustard when it reads the “h264” from HDSLR cameras like the Canon EOS range and Panasonic GH range. General grunge is added when the footage is converted from the YUV (YCbCr) to RGB colour space i.e. ProRes etc.
A python script for batching GH2 conversions is available from the comments in the Vimeo video Bay to Breakers 2011 or direct link: http://dl.dropbox.com/u/8712060/GH2-5dtorgb-batch-v1.4.command.zip
Update: Kevin Jardin’s settings for GH2 footage conversion: ProRes 422HQ, decoding matrix 709, gamma 1.8.