VideoStreaming5.swift

func rewindVideo(by seconds: Float64) {
    if let currentTime = player?.currentTime() {
        var newTime = CMTimeGetSeconds(currentTime) - seconds
        if newTime <= 0 {
            newTime = 0
        }
        player?.seek(to: CMTime(value: CMTimeValue(newTime * 1000), timescale: 1000))
    }
}

func forwardVideo(by seconds: Float64) {
    if let currentTime = player?.currentTime(), let duration = player?.currentItem?.duration {
        var newTime = CMTimeGetSeconds(currentTime) + seconds
        if newTime >= CMTimeGetSeconds(duration) {
            newTime = CMTimeGetSeconds(duration)
        }
        player?.seek(to: CMTime(value: CMTimeValue(newTime * 1000), timescale: 1000))
    }
}