How to extract a thumbnail from a video file with mplayer

```ruby mplayer 123.avi -ss 1 -nosound -vo jpeg:outdir=. -frames 2 ``` We use the **-ss** switch to jump to the first second of the video; specify the time in either seconds or hh:mm:ss. We tell mplayer that we want two frames with the **-frames** switch. Make sure jpeg is in the list of supported video output formats: ```ruby mplayer -vo help ```