Frame averaging is where multiple (a variable amount) captures of video images are taken on each shot in order
the to get an average color for each pixel to reduce the video noise.
The top image is without frame averaging. Notice the video image noise, especially on the wall.
The middle image is frame averaged set to 20 frames. It is much cleaner but has a slight blur.
The bottom image is same as middle image along with video sharpness setting to 43.
The menu Options > Video Settings has an Adjustments tab for image settings where
sharpness can be adjusted.