O MPlayer pode fazer isso
MPlayer comes with a very nice and
easy to use video filter that allows
taking single or multiple screenshots.
The syntax is simple:
Code:
mplayer -vf screenshot my_file.mp4
Simply pressing the 's' key takes a
single screenshot in png format in the
working directory. If you wish to take
a series of screenshots you can press
the 'S' key and MPlayer will keep
taking screenshots until the 'S' key
is pressed again. However if this is a
little too straightforward for you
MPlayer also can also output images in
a slightly different way that has a
few more options:
Code:
mplayer -nosound -frames 5 -vo png:z=9
my_file.mp4
This will output the first 5 frames of
the media file in high quality png
format into the working directory.
Similar screenshots can be taken by
using jpeg, gif89a, targa and pnm as
'-vo'. How incredibly cool is that!