Crop .MP4 video that is produced by my iOS app

Hello.

I have an iOS app that I need to revise. The app is free and you can get it from Apple store. It is called "Twist a Tweet". The app plays a tweet as an animation. Then, it produces .MP4 video file as an output. Right now, the dimensions of the video are fixed size 320x456. The animation size is scalable, so it can take the whole screen size, but it can be very tiny. Even when the animation is taking 50 x 50 area in the middle of the screen, the dimensions of the video will still be 320 x 456...

I need to be able to crop the video file down to the size of the animation and just leave the border of 10 pixels wide.

C プログラミング C＃プログラミング iPhone Mobile App Development

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