iOS AVFoundation - Show a time display over a video and export

Question

I want to show a display overlay over a video and export that video including this display. I had a look into the AVFoundation Framework, AVCompositions, AVAssets etc. but I sti

Answer 1

I think you can use AVCaptureVideoDataOutput to process each frame and use AVAssetWriter to record the processed frame.You can refer to this answer

https://stackoverflow.com/a/4944594/379941 .

use AVAssetWriterPixelBufferAdaptor's appendPixelBuffer:withPresentationTime: method to export
And I strongly suggest using OpenCV to process frame. this is a nice tutorial

http://aptogo.co.uk/2011/09/opencv-framework-for-ios/.

OpenCV library is very great.