I'm current using AV Foundation to export images as videos. Now I want to add kens burn effect to these images when they are exported as a video.
As far as I know, this is achievable through AVVideoComposition but I'm not sure how to start.
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AVMutableVideoComposition.animationTool (AVVideoCompositionCoreAnimationTool) looks promising.
That and AVMutableVideoCompositionLayerInstruction's
should be a good start, assuming the Ken Burn's effect can be implemented by interpolating affine transforms.