I have tried to do this with quite a few similar cameras. The only one I've succeeded with is a Samsung i6. Even it has a conversion program the movies have to be run through before they will play on the camera.
I have a Sanyo CG65, and have not yet been able to do this with it. I agree it is quite frustrating, but the movie making programs have so many combinations of parameters in their output that you stand little chance of guessing the correct recipe.
I've speculated that if you load a video clip from the Sanyo into VirtualDub or something like it, you can read the header information. Then use that to tailor the movie making software's output to the same parameters.