^ jesus christ, that's long!
here's how i captured mine:(prerequisite: ffdshow MUST be the decoder for the video, if you're using coravc and your video is in h264 it won't work)
1. open video, the skip to a few seconds before the desired scene and pause.
2. double click the ffdshow video(red one) icon in systray.
3. find the "grab" checkbox on the left.
4. tick the "every frame" radio button, set "grab every __ frame" to 2 or 5, actually, just experiment, i find 3 to be the best.
5. set path, it must be preexisting, that is, you made the folder in windows explorer beforehand.
6. image format to png, for obvious reasons.
7. go back to mpc and play.