Merge

What is it?

Overlay transparent PNG images on top of other images or videos. This is useful for apps that need to watermark videos, or apps where a user can draw on top of a video.

Used in https://itunes.apple.com/us/app/.gif/id1061699394?ls=1&mt=8 check it out!

Getting Started

Merge is initialized with a configuration struct that is open for extension. Simply extend Merge to have full control over frame rate, export directory, export quality and overlay placement.

struct MergeConfiguration {
  let frameRate: Int32
  let directory: String
  let quality: Quality
  let placement: Placement
}

extension MergeConfiguration {
  static var standard: MergeConfiguration {
    return MergeConfiguration(frameRate: 30, directory: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0], quality: Quality.high, placement: Placement.stretchFit)
  }
}

Placement

stretchFit: Stretches the ovelay to cover the entire video frame. This is ideal for situations like adding drawing to a video.
custom: Custom coordinates for the ovelay and size for the overlay.

enum Placement {
  case stretchFit
  case custom(x: CGFloat, y: CGFloat, size: CGSize)
}

Overlay an image on a video.

Note: For performance reasons the progress closure is not called on the main thread.

let merge = Merge(config: .standard)

merge.overlayVideo(video: AVAsset, overlayImage: UIImage, completion: { url in

// Video done exporting
}) { progress in
// progress of video export
}

Installation