Canon PIXMA MG4200 Series On-Screen Manual page 220

4.
Display the frame you want to capture as a still image.
Drag the slider in the Video Frame Capture view or use the still image capture panel to display the
frame you want to capture.
Note
(Pause) or (Playback) appears on the still image capture panel while a video is playing or
stopped, respectively.
Using (Pause) and
panel makes it easier to display the frame you want to capture.
5.
When the frame you want to capture as a still image appears, click Capture
(single frame) on the still image capture panel.
(Frame Backward)/(Frame Advance) on the still image capture