I write a small DirectShow app: want to play video and paint static picture on it.
I follow the steps:
1.use EVR DS filter to RenderFile() and IMediaControl::Run()-> no problem, can play video normally.
2.use IMFVideoDisplayControl::GetVideoWindow() to get video window handle -> I can get.
3.use IMFGetService::GetService() to get IMFVideoMixerBitmap -> return S_OK.
4.call IMFVideoMixerBitmap::SetAlphaBitmap() -> return S_OK.
But on the video window, there is no static bitmap!
Why Do I lose some steps
MSDN sample: http://msdn2.microsoft.com/en-us/ms701866.aspx
One Topics: http://forums.microsoft.com/MSDN/
How to use IMFVideoMixerBitmap?
jsedlak
Now I can paint image on video.
I just use the global video window handle, and it can display.
Why the handle from IMFVideoDisplayControl can't be used
Sheng Jiang (蒋晟)
use the HWND to CreatCompatibleDC(), then use IMFVideoMixerBitmap::SetAlphaBitmap() to paint the bitmap DC.
My doubt:
I use IMFVideoDisplayControl::SetVideoWindow() and global video window handle to set Video Windows. But while using IMFVideoDisplayControl::GetVideoWindow(), the HWND is not the same as global video window. why
Juan Carlos Ruiz Pacheco
What are you using the HWND for
For your original question, I was going to ask to see what your MFVideoAlphaBitmap structure looked like. I'm still curious to verify that you are passing correct parameters for this...
Jay Senior
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