
With onboard 4K recording at 24p or HD recording at a range of frame rates up to 60p;[and]Clean HD via HDMI, the Canon EOS-1D C offers additional capabilities for film[and]TV production as well as specialty image acquisition applications. With the Canon EOS-1D C, you can record 1080p videos in H.264 compression format. This is an ideal file type for video capture in an SLR camera, delivering relatively compact file sizes with image quality noticeably superior to alternate video compressions (such as Motion JPEG).
However, you may have problems when importing[and]editing Canon EOS-1D C H.264 footage in Final Cut Pro X on Mac. The H.264 compression format requires that files be transcoded into a format better suited to editing, effects,[and]color grading; this would usually be Apple ProRes, which ensures maximum editing quality[and]efficiency when working with Final Cut Pro X. For this purpose, this article will show you how to convert Canon EOS-1D C H.264 to ProRes MOV in detail.
Transcoding Canon EOS-1D C H.264 to Apple ProRes MOV for Final Cut Pro X
The quick workaround is to use the easy-to-use yet professional app called Brorosft Video Converter for Mac which can be used as a Canon Video Converter under OS X Leopard (10.5), Snow Leopard (10.6), Lion (10.7), Mountain Lion (10.8). It is free, clean[and]safe to install[and]use. With it, you can effortlessly transcode Canon H.264 to ProRes MOV for Final Cut Pro 6/7/X,[and]it works well[and]converts flawlessly. Below is how.
Step 1: Install[and]launch the Canon H.264 Video Converter for Mac,[and]click the "Add" button to load the EOS-1D C footage. You can also use the drag-and-[drop]method to load the 1080p video files to the application UI.

Step 2: Press “Format” option[and]navigate the mouse cursor to choose "Format > Final Cut Pro > Apple ProRes 422 (*.mov)" as the best codec for FCP 6/7[and]FCP X on Mac.
If you are a FCP 6 or former version user, you only can choose ProRes 422[and]ProRes 422 HQ as the output format.

Tip: You may as well click Settings to set video size to 1920*1080, frame rate to 30fps for easy editing.
Step 3. You can edit the MTS video before you convert Canon EOS-1D C H.264 to ProRes MOV.
By clicking “Edit” button, you can trim, crop the video, or add watermark[and]adjust effect to the videos which you will convert.

Trim – Choose to reserve the part you need. Just choose the chapter which you need to trim, to set “start time” or “end time”, type the portion which you want to save.
Crop – Remove black edges of your video or just get the scale of this video you want.
Effect – Adjust the effects by adjusting the parameters, such as:
1) Deinterlacing – If there are some stripes on the picture, you can check this option to make a better picture effect. (Checked by default)
2) If you want to get 3D effect, just enable this fuction[and]do settings:
Step 4: Click the “Convert” icon under the preview window,[and]the Mac MTS to ProRes Converter will start transcode EOS-1D C H.264 video to Prores MOV for FCP(X) on Mac.
After the conversion, click the “Open” button to locate converted files, then load ProRes .MOV files in FCP (X). Now you can successfully[and]easily import Canon EOS-1D C H.264 footage to FCP 6/7 or FCP X for editing with best quality.
Additional Tips:
1. If you are also a FCP X user, before you try to do the conversion, don’t forget to make sure that you have installed the Apple ProRes Codec manually since the FCP X asks users to install it by themselves.
2. If you want to edit Canon H.264 videos in iMovie, you just need to choose the “iMovie[and]Final Cut Express -> Apple InterMediate Codec (AIC) (*.mov)” in the second step.
3. If you want to batch conversion, the professional iMedia Converter for Mac is the best choice for you.
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Source:
Transcode EOS-1D C H.264 footage to ProRes for Final Cut Pro X