I do not have a GH1, but a G2. I use lpowell fast GOP 3 and it is very stable. I never got lock up. I think other lpowell settings will serve your GH1 nicely. May be a good idea is to check 75Mbps Peak Reliability thread or 40Mbps In-Camera Reliability. If you want the highest quality of native 24p, then you might risk the reliability. These setting include blackout-lpowell, 100Mbps maximum latitude, or Varigop.
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