It's possible.
For a single image every 240 frames, assuming a frame rate of 60, you can
exploit the select filter as shown:
ffmpeg -i input -filter:v 'select=not(mod(n\,240))' image%02d.png
%02d means the images have a 2-digit number in the filename. For a 6TB
video, larger numbers will be required, for example %06d
Another way to do the same thing is to specify an output frame rate of
0.25 (4 seconds from one image to the next):
ffmpeg -i input -vf fps=0.25 image%06d.jpg
Michael
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