@mwesb1978-0 There's another application called "Auto Movie Thumbnailer" ( https://funk.eu/amt/ ) that lets you put a whole folder of many videos and then in makes a folder with .jpg thumbnails for each video. This can be really handy if you have a lot of videos in the torrent and want to give a thumbnail image for each one. (I wish more users did this.)
Thanks for your desire to have these thumbnails, regardless of what software you end up using. I know other users will appreciate your efforts.