Mplayer does that, and you can run it thru system so you can do batch processing. See z-charcoal-video-converter for how to run mplayer from Perl, and check out Lives

Also googling for something like "mplayer screenshot" should give good results.

#> I am looking for Linux tools for extracting the individual frames o
+f
#> an AVI movie file, and saving them to files in bitmap formats such 
+as
#> JPEG. Any suggestions?

mplayer -vo jpeg z-men.mpg
#(generates 1 JPEG per frame, plays all frames)

# mplayer -vo jpeg -ss 1:23:45 -frames 20 file.avi
#(-sseeks to 1 hour 23 minutes 45 seconds in file.avi, generates 20 JP
+EGs
#from the subsequent frames, quits)

#"man mplayer" for more stuff, like skipping to the start of a DVD
#chapter.
[download]