I would like to write my own video format.
So I encrpyt .3gp or any format to my format( .xxx)

But When I want to play it.
If I decrypt whole file to play. It will too long.

So One solution is to encrypt files in frame instead of whole files.

Example. If file's size is 1024 bytes I will encrypt it by frame such as
frame size is 128 bytes I will encrypt it 8 times.

Then when I want to play it , I decrypt it by frame too and feed them to play.

I wanna know that is it possible to play video file in frame size (simutaneously) instead of whole file.

Sorry for my english.

And thank you for all advices.