Flv file set thumbnail from frame

I have many videos in .flv and .mp4 formats. I store then in one Windows folder and re-name after downloading so that it becomes easy to find one that I want to play.

It would be best if I can create thumbnail from one of the frames of video file.

Is there a program/utility in which I can open the .flv or .mp4 file, play, pause and take the screen/frame and set it as thumbnail of that file?

I did my best to find it on internet but failed hence thought to reach out to Gurus.

Thanks in开发者_Python百科 advance, Jay

I think ffmpeg and mencoder can do this