Video won't play in preview mode. Any ideas?

Hello everyone.
Wondering if anyone can help me with a little issue I'm having with Final Cut Pro.
For some reason, video playback won't work in preview mode (apple+F12). It just pauses, but the audio plays. I've checked that the Video Playback is set to Digital Cinema and that I select All Frames in External playback, but it still remains looking like a still frame - with the audio. However, the footage plays fine in the canvas window.
Any clues on what the issue could be?
Just so you know, I'm using a Lumix GH3 camera, with no firewire. I have to import the .mst files into iMovie, with USB, and export them into .movs to get them to work in Final Cut. If anyone knows of a much simpler way to do this then that would be a great help.
Could that affect the playback?
Thanks in advance.

there's probably your problem. Although fcp will allow you to import h264 quicktimes, it's not a compatible format. Use compressor to convert to prores422. Post back if you need any further help with this.

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