Re: Two Webcam in a graph

On Fri, 17 Jun 2005 01:07:08 -0700, Pierre wrote:

> Hi, i'm putting two webcam in a graph for make stereoscopic image.
> I use the sub graph method :
>
> Cam 1 - Grabber1 - PGraph->Render(Grabber1 Out pin)
> Cam 2 - Grabber2 - PGraph->Render(Grabber2 Out pin)
>
> I have a problem, with the video window, I put video window to false but one
> video window (of the 2 cam) stay active.
> I do :
> CComPtr< IVideoWindow > pVideoWindow ;
> hr = pGraph->QueryInterface(IID_IVideoWindow,(void**)&pVideoWindow);
> if (pVideoWindow)
> hr = pVideoWindow->put_AutoShow(OAFALSE);
>
> I thinks this method put the video window to false for only one video
> renderer.
> Only one active movie window is always run.
>
> I want to put the two window to false.
> How i can access at each camera's pwindow (renderer) and put their autoshow
> to false.

>From the docs:

"In most cases, an application should query the Filter Graph Manager for
this interface, and not call the filter directly, because of the messaging
issue just described. However, if the filter graph has more than one Video
Renderer, the Filter Graph Manager only communicates with one of them,
selected arbitrarily. Therefore, if your application uses multiple video
windows, use the IVideoWindow interface directly on the filters. In that
case, you must forward window messages to each Video Renderer instance,
using the IVideoWindow::NotifyOwnerMessage method."

So you need to QI on each video renderer filter, not on the FGM.


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