There are 100 differant ways to get things done on a PC.
Myself I use a Kodak digital camera and or a Sealife DC800 for scuba videos (Also a digi-cam).
When shooting cannon and mortar I prefer to use a cheap tripod. If you use a tripod your pictures are much cleaner (No-movement or at least very little) Also your background doesnt move. This allows you certain benefits when doing video or animations. For example. With any digital camera on movie mode (Preferably one that saves in a windows format .avi or .mpg) (.mov is a MAC profile) then windows movie maker will allow you to get the still images you are looking for. However if the movie was done with a tripod to begin with ., then after getting the images you want ., you could then stitch them back together with any gif animation program. (I use Jasc Paint-Shop-Pro and Jasc Gif-Animator) . Here are a few examples below.
These are the individual frames ..., we did not use a tripod on this one ., therefore with the assembled animation you will see movement from the camera.
Here is the animation.
By selecting certain frames we can see the projectile. (This is a very small Black Powder charge as well otherwise my camera can only get maybe one or 2 frames with the projectile ., and that is with a standard everday cheapo digital camera (Kodak 5.megapixel 3 year old) ., which takes 30 frames per second video thats standard.