Canon EOS 80D - Manual (Page 211)

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3 Setting the Movie Recording Size
 Compression Method
Fixed at W if the recording format is MOV. For the MP4 format,
X
or Xv can be selected.
• In MOV Format
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) and IPB (Light), the movie is
better suited for editing.
• In MP4 Format
X IPB (Standard)
Compresses multiple frames at a time efficiently for recording.
Xv IPB (Light)
Records a movie at a bit rate lower than with IPB (Standard),
resulting in a smaller file size and compatibility with a larger range
of playback systems.
If you change the [53: Video system] setting, set the movie recording size
again.