Instance Property
dimensions
視訊解析度（僅 video Track 有值）
@Published var dimensions: CMVideoDimensions? { get set }Discussion
遠端：
RemoteVideoTrack.handleReceived從 pixelBuffer 讀取後更新本地：尚未實作（LocalVideoTrack capture 路徑未更新此值）
Instance Property
視訊解析度（僅 video Track 有值）
@Published var dimensions: CMVideoDimensions? { get set }遠端：RemoteVideoTrack.handleReceived 從 pixelBuffer 讀取後更新
本地：尚未實作（LocalVideoTrack capture 路徑未更新此值）