What is frame grabber?
frame grabber grabs a single frame from a video and saves it as a still image.
How to use
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Tap the frame grabber icon to start the application.
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Tap the screen to select a video.
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Find the frame you want to grab:
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Drag the thumbnail until your desired scene is in the center.

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Slide the center controller up to narrow your search.

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Repeat until you’ve found the frame you want to grab.
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When your frame is displayed, tap the video to show the save screen.

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Tap the save button, and the frame is saved as a still image.

Refer to http://www.sonydna.com/sdna/e/products/framegrabber/ for detailed help.