Canon EOS-1D C - Manual (Page 38)

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3 Setting the Movie-recording Size
An increase of the camera’s internal temperature may cause movie
shooting to stop before the maximum recording time shown on the
preceding page (p.55).
Even if [Record func.] is set to [Auto switch card], the card cannot be
switched automatically during movie shooting.
If you delete part of the multiple movie files created from one successive
shooting whose file size exceeds 4 GB for a single movie shoot (single
clip), playing them back consecutively or saving them as a single movie
file with EOS MOVIE Utility (p.94) is not possible.
EOS MOVIE Utility can automatically combine individual 4 GB movie files
and save them as a single movie file.
About Full HD 1080
Full HD 1080 indicates compatibility with High-Definition
featuring 1080 vertical pixels (scanning lines).