As far as I know, the Canon T3i/600D recorded videos are in H.264 MOV format, the H.264 codec is not good for FCP editing, it takes long time to render, and you can't edit the H.264 videos smoothly in Final Cut Pro 6/7 or FCP X. The best method to solve these problems is to compress Canon EOS MOV footages to ProRes 422 encoded MOV format, as it's best/natively supported by FCP. Below I will throw a quick guide up on how to convert/import Canon T3i/600D h.264 videos to Final Cut Pro with Apple ProRes codec.

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