Canon EOS 5DS Instruction Manual page 298

3 Setting the Movie Recording Size
Compression Method
W ALL-I (For editing/I-only)
Compresses one frame at a time for recording. Although the file size
is larger than with IPB (Standard), the movie is more suited for
editing.
X IPB (Standard)
Compresses multiple frames at a time efficiently for recording. Since
the file size is smaller than with ALL-I (For editing), you can shoot
longer (with a card of the same capacity).
Total Movie Recording Time and File Size Per Minute
Movie Recording
Quality
65
W
4
L
65
X
4
87 W
w
87 X
x 65 X
An increase of the camera's internal temperature (p.317) may cause movie
shooting to stop before the maximum recording time shown in the table.
298
Total Recording Time on Card
4 GB 8 GB
5 min. 11 min.
16 min. 33 min.
6 min. 13 min.
19 min. 38 min.
48 min. 1 hr. 37 min.
(Approx.)
File Size
16 GB
23 min. 654MB/min.
67 min. 225MB/min.
26 min. 583MB/min.
1 hr. 17 min. 196MB/min.
3 hr. 14 min. 78MB/min.