Video Snapshot is an easy to use utility to capture a still from video.
Download latest version from Releases page and run.
Usage: VideoSnapshot.exe /i <value> [/o <value>] [/n <value>]
-i <value> source video file
-o <value> output path of the snapshots
-s <value> start time of snapshots to save (default: 20)
-n <value> count of snapshots to save (default: 1)