If the shutter-release button is pressed all the way while recording a movie, one frame is saved as a still image (JPEG image) (except Movie manual mode). Movie recording continues while the still image is being saved.
A still image can be captured when is displayed on the screen. When is displayed, a still image cannot be captured.
The size of the captured still image is the same as the movie image size. Movie options
Notes about capturing still images during movie recording
Still images cannot be saved during movie recording in the following situations:
In Movie manual mode
When movie recording is paused
When the remaining movie recording time is less than five seconds
When [Movie options] is set to an HS movie option
When the shooting menu [Image quality] is set to [RAW] or [RAW + Fine], a still image is captured as [Fine]. When [Image quality] is set to [RAW + Normal], it is captured as [Normal].
Up to 20 still images can be saved while recording a single movie when [Movie options] is set to [2160/30p] or [2160/25p]. Still images are captured as [Fine].
It may take some time to save the images after shooting.
The frames of a movie that were recorded when a still image was being captured may not play back smoothly.
The sounds of operating the shutter-release button when saving a still image may be heard in the recorded movie.
If the camera moves when the shutter-release button is pressed, the image may be blurred.