VMR7 black on a secondary screen.

Question

Im trying to show video using VMR7 on a secondary screen. It almost works, however when video is paused and I do this:

I create new window on a secondary screen and use SetWindow on VMR7, it just displays black screen. Now when I move that window to a primary screen, it will show picture. When I move it back to secondary, it still displays black. When i now push play, it works. Can you  help me?

I've tried setting monitors:

	if (monitorConfig != null && _videoHost.WindowType == WindowTypes.Projector)
					{
						var monitorArray = new VMRMonitorInfo[2];
						var devicesRead = 0;

						VMRGuid monitorGuid;
						var defaultMonitor = monitorConfig.GetDefaultMonitor(out monitorGuid);

						monitorConfig.GetAvailableMonitors(monitorArray, 2, out devicesRead);
						if (devicesRead > 0)
						{
							foreach (var monitorInfo in monitorArray)
							{
								if (monitorInfo.guid.GUID != monitorGuid.GUID)
								{
									//monitorConfig.SetDefaultMonitor(monitorInfo.guid);
									monitorConfig.SetMonitor(monitorInfo.guid);
								}
							}

						}
					}

It does pass SetMonitor() with a right monitor, however it does not help anything. Video is still black and only shows when I drag that window to primary window.

What I discovered, is that flushing(CurrentPosSeconds=CurrentPosSeconds) does seem to "refresh" the "rendering contextes".

My current solution seems to be working;

I respond to WM_SHOWWINDOW with this:

/// <summary>
		/// Updates the rendering surface. Sometimes VMR7 does not play cool.
		/// </summary>
		private void UpdateRenderingSurface()
		{
			//force refresh.
			var window = Window.GetWindow(this);
			if (window != null)
			{
				window.InvalidateArrange();
				window.InvalidateMeasure();
				window.InvalidateVisual();

				window.UpdateLayout();
			}

			//set position to same PLACE you current
			//but this is only needed for Projector. ly are@
			if (WindowType == WindowTypes.Projector)
			{
				var mediaSeeking = _graph as IMediaSeeking;
				if (mediaSeeking != null)
				{
					long position = 0;
					var hr = mediaSeeking.GetCurrentPosition(out position);
					mediaSeeking.SetPositions(position,
											  AMSeekingSeekingFlags.AbsolutePositioning,
											  null,
											  AMSeekingSeekingFlags.NoPositioning);
				}
			}
		}

You might also want to create HWND with correct cordinates right away.

			// since VMR7 wants our renderingcontext created on a seperate window, then this is needed.
			// hopefully this helps avoiding black window on a secondary screen problem.
			if (windowType == WindowTypes.Projector)
			{
				x = (int)ViewHelper.ProjectorView.Left;
				y = (int)ViewHelper.ProjectorView.Top;
				width = (int)ViewHelper.ProjectorView.Width;
				height = (int)ViewHelper.ProjectorView.Height + 20;
			}

			//automatically hidden ;)
			//no WS_OVERLAPPEDWINDOW
			VideoHwnd = CreateWindowEx(0, "static", "",
						   WindowStyles.WS_CLIPCHILDREN | WindowStyles.WS_CLIPSIBLINGS,
						  x, y,
						  width, height,
						  IntPtr.Zero,
						  IntPtr.Zero,
						  IntPtr.Zero,
						  IntPtr.Zero);

			//remove WS_BORDER.
			const Int32 gwlStyle = (-16);
			long style = GetWindowLong(VideoHwnd, gwlStyle);
			style = (style & (long)~WindowStyles.WS_BORDER) | (int)WindowStyles.WS_CHILD;
			SetWindowLong(VideoHwnd, gwlStyle, (int)style);

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C#/C++ | WPF/DirectShow/OpenGL/Winapi/

Answer 1

maybe u should respond to windows WM_DISPLAYCHANGE message.

call CBaseRenderer::OnDisplayChange, see if it helps.

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Steve