extern private static int startDecode(string url, int framerate, dlgtOnFrameRead dataCall);
extern private static int startInputDecode(string url, dlgtOnFrameRead dataCall, dlgOnDecodeStop stopCall);
extern private static int startDecode(string url, int framerate, dlgtOnFrameRead dataCall);
extern private static int startInputDecode(string url, dlgtOnFrameRead dataCall, dlgOnDecodeStop stopCall);