Canon EOS 5D Mark III with L-Series Zoom Lens Owner's Manual

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Shooting Movies
Movie shooting is enabled by 
setting the Live View shooting/
Movie shooting switch to <k>. 
The movie recording format will 
be MOV.
Cards that can record movies
 
When shooting movies, use a large-capacity card with a 
fast writing/reading speed as shown in the table.
 
If you use a slow-writing card when shooting movies, the movie 
may not be recorded properly. Also, if you play back a movie on 
a card with a slow reading speed, the movie may not play back 
properly.
 
If you want to shoot still photos while shooting a movie, you will 
need an even faster card.
 
To check the card’s reading/writing speed, refer to the card 
manufacturer’s Web site.
Compression
 Method (p.231)
CF Card
SD Card
IPB
10 MB/sec. or faster
6 MB/sec. or faster
ALL-I (I-only)
30 MB/sec. or faster 20 MB/sec. or faster