Render video in metal.

Instead of a Timer in VideoReader.swift, try using CADisplayLink with a selector that points to this method

 @objc private func readBuffer(_ sender: CADisplayLink) {

        let nextVSync = sender.timestamp + sender.duration

        let currentTime = playerItemVideoOutput.itemTime(forHostTime: nextVSync)

        if playerItemVideoOutput.hasNewPixelBuffer(forItemTime: currentTime),

           let pixelBuffer = playerItemVideoOutput.copyPixelBuffer(forItemTime: currentTime, itemTimeForDisplay: nil),

           let f = getClosestFrame(time: currentTime.seconds) {

            // Code 

        }

    }