video clip snapshots

Does anyone know of any tool (ideall free) that can snapshot an image of a video file at various points like a thumbnail trail of every 30 seconds or something? We have been asked to manually trawl through upwards of 200 video clips on a PC to check non are untoward. I wondered if theres any software that can say look here is a screenshot every 20 seconds so you can get an idea of the content as opposed to manually having to view each clip through.
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There should be a miriad of apps like that.

Check this one:

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