Movist plays hacked GH2 footage. It will play every clip in the folder if you play the first clip or drag the folder on the Movist icon.
http://code.google.com/p/movist/
Also Eyetv plays GH2 footage, but you have to got to Get Info and change the Open With ... to Eyetv and Change All. They will open when you double click the file. Also shows the bit rate when STREAM Info is chosen.
MplayerX does not work for me on sedna files... at least reading off the SD card, which is fast enough to play in VLC player, albeit with some stuttering after a while. On an i7 macbook pro. Mplayer just holds on the first frame.
Oops. My Bad. Works great!
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