DT Video Thumbnailer is an desktop application allows you to make thumbnails (caps, previews) of video files. Supports of practically any videos-formats

Upload output image (thumbnail) to any image webhosting service
Very fast
Easy to use
Possibility to save each shot in separate file
Load and save options presets
Autoadjustment of height of a shot
Customizable fonts, colors, contours, shadows, frames, background, text
Stamp time in shots
Video information stamp
Substitute black frames