From SUU Design:
Video Thumbnails Maker is another project designed by Scorp (SUU Design). It allows you to make thumbnails (caps, screenlists) and screenshots of video files. The key features of the program are supports of the batch processing of videofiles, supports of practically any videos-formats
three rendering engines, Command Line Interface support, and
fully customizable presets. It also includes customizable fonts, colors, contours, shadows, frames, background, text
special effects (drop shadow, gray scale, cut edges), watermarks (alpha-channels, transparency).