Hi, a question about video editor

English
Hi. I need an app that can create some simple video animation. I am not a professional user so I need an easy to use and cheap app.
I prefear an app that can offers effects similar to the image editors app's effects (like Pixelmator) with masks, bledding effects and vectorial drawing and animation similar CSS or Flash. Is it possible?
Italiano
Ciao a tutti. Io avrei bisogno di un'app che possa craere animazioni video semplici. Non sono un utente proffessionista quindi ho bisogno di un'app economica e semplice da usare; e preferirei un'app che offra effetti simili a quelli di app come Pixelmator, con maschere, effetti bledding e magari il disegno vettoriale e animazioni simili a quelle di CSS o Flash. È possibile?

Your arithmetic looks good to me.  As well as compression, I assume that only the differences from one frame to next are stored (as well as probably loads of other clever techniques that keep the video looking good, but if you view it frame by frame
may not be quite as good as you think - your eyes and brain fill in a lot of details and I bet this is all used to keep the bit rate as low as possible).
This may not be much data between most frames unless your images change a lot from one frame to the next.  During periods of lots of action if your transfer rate isn't great enough you will get pixilation.

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