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OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

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Draw a mask image like Left-3 to blend a rounded corner:

func UIGraphicsDrawAntiRoundedCornerImageWithRadius(radius: CGFloat, outerSize: CGSize, innerSize: CGSize, fillColor: UIColor) -> UIImage{  
    UIGraphicsBeginImageContextWithOptions(outerSize, false, UIScreen.mainScreen().scale)
    let currentContext = UIGraphicsGetCurrentContext()

let bezierPath = UIBezierPath()

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import Foundation

extension String
{
    var length: Int {
        get {
            return countElements(self)
        }
    }