The IDirectDrawVideoPort::UpdateVideo method updates parameters that govern the flow of video data from the video-port to the DirectDrawSurface object.
HRESULT UpdateVideo(
LPDDVIDEOPORTINFO lpVideoInfo
);
If the method succeeds, the return value is DD_OK.
If the method fails, the return value may be one of the following error values:
DDERR_INVALIDOBJECT |
DDERR_INVALIDPARAMS |
IDirectDrawVideoPort::SetTargetSurface, IDirectDrawVideoPort::StartVideo, IDirectDrawVideoPort::StopVideo