public var timescale: CMTimeScale public var flags: CMTimeFlags public var epoch: CMTimeEpoch public init() public init(value: CMTimeValue, timescale: CMTimeScale, flags: CMTimeFlags, epoch: CMTimeEpoch) } extension CMTime { public init(seconds: Double, preferredTimescale: CMTimeScale) public init(value: CMTimeValue, timescale: CMTimeScale) } value: ϑϨʔϜ timescale: 1ඵ͋ͨΓΛԿϑϨʔϜʹׂ͢Δ͔ʁ