Quick and simple project to demostrate how to generate videos from an image, merge a video with sound, or add a watermark image to a video using Xamarin.iOS. I spent several hours to make these work and I wanted to share it in case someone else needs it.
Given an image and a duration, a video is created. AVAssetWriter is used for this.
Given a video and an audio, a new video is created. The video sound will now be the given audio. AVMutableComposition and AVAssetExportSession is used for this. You could add as many audio tracks as you want.
Given a video, an audio and an image, a new video is created. The video sound will now be the given audio and an overlay image layer is added to the video. This could be used to add a watermark, to add a title, or for anything static. Also, video will be looped until audio finishes, but this behaviour can be easily changed.
In this example we create the watermark image in the XCode interface builder, allowing us to create an image dynamically. This way you could choose the name printed on the video, or change a watermark image right in execution time. For this we convert an UIView to an image, and then we add it to the video.
AVPlayerViewController is used for video playback. The project contains a video bigger than 7MB.