Hi i am looking for a snapshot tool to take snaps every few secs from a movie. I also want to take screenshots every time i press a key. Any suggestions?
One simple way would be to use ffmpeg CLI tool. Suppose you have a file called ‘video.avi’, that you wish to grab frames from (every 10 seconds say), and save as a series of jpg files called movie_pic1, movie_pic2 etc. Then you could do something like this:
ffmpeg -i /home/dean/Desktop/video.avi -r 0.1 -sameq -f image2 movie_pic%d.jpg
You may use smplayer, a graphical front-end for mplayer. You can take screen shot by pressing a key.
Well it seems to work for me. But i cant take screenshot every 20 or 30 secs 
so u can keep suggesting plz.
And one more thing what is the default resolution for dvd playback?
Video: mpeg2video, yuv420p, 720x576 [PAR 64:45 DAR 16:9], 7000 kb/s, 25.00 tb(r)
In kde42 community
application: videocut
Well it seems to work for me. But i cant take screenshot every 20 or 30 secs
Worked for me at 20 (1/20=0.05) second intervals:
ffmpeg -i /home/dean/Desktop/video.avi -r 0.05 -sameq -f image2 thumbs%d.jpg
so u can keep suggesting plz.
Maybe try what others suggested.
And one more thing what is the default resolution for dvd playback?
DVD (PAL) resolution: 720x480 (Full D1) 25 fps
DVD (NTSC) resolution: 720x480 (Full D1) 29.97 fps
ffmpeg is very good I agree. I guess it puts some off being CLI, although just about everything we do in audio and video can be traced back to ffmpeg and libavcodec (the library that powers ffmpeg).
man ffmpeg
will help or: FFmpeg Documentation