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 | 
  Windows NT/2000: Requires Windows 2000.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Header: Declared in dvp.h.
  Import Library: Use ddraw.lib.
IDirectDrawVideoPort::SetTargetSurface, IDirectDrawVideoPort::StartVideo, IDirectDrawVideoPort::StopVideo