Movie Thumbnailer (mtn) saves thumbnails (screenshots) of video files to image files (jpg, png, webp, avif).
It uses FFmpeg's libavcodec as its engine, so it supports all popular codecs, e.g. h.265/hevc, h.264, AV1, VP9, mpeg1, mpeg2, mp4, vc1, wmv, xvid, divx...