mplayer (1.0pre5-3.2.2) can output video using many drivers.

to name but a few, it currently has drivers which can output each frame to gif89a, jpeg and png. as well as ASCII art and colour ASCII art - these will work in a console! these options are passed with the video output flag
-vo gif89a
-vo jpeg
-vo png
-vo aa
-vo caca


other interesting relivant options include
-fps <value> to set the framerate.
-frames <number> to convert the <number> of frames then quit.
-sb <byte position> to seek to a byte position.
-ss <time> to seek to a time position.


so you probably want something like

Code:
mplayer -vo jpeg -fps 10 -frames 10 -ss 500 File.mpg
the resulting files are normally huge.

get mplayer and codecs here http://www.mplayerhq.hu/