如何在C＃中使用DirectShowLib将图像与USB捕获设备的视频流混合 [英] How can I mix Image with a Video stream from USB capture device using DirectShowLib in C#

问题描述

我可以在窗口中显示视频流。我在C＃中使用DirectShow VideoMixingRenderer9。我创建了一个带有文本的图像。现在，我如何将该图像与视频流混合，以便在捕获窗口中同时显示视频流和文本。我尝试使用ISampleGrabber过滤器，但它不适用于所有视频设备，并且捕获屏幕仅显示黑色背景的文本，而没有视频流。因此，我不想使用ISampleGrabber过滤器。

I'm able to show a video stream in a window. I'm using DirectShow VideoMixingRenderer9 in C#. I have created an Image with sometext in it. Now, how can I mix this image with the video stream so that both video stream and text is shown in the capture window. I tried with ISampleGrabber filter but it doesn't work with all video device and capture screan only shows the text with black background but no video stream. So I don't want to use ISampleGrabber filter.

推荐答案

IVMRMixerBitmap9接口应该对您有所帮助，该接口由VMR实现。这是MSDN的链接：

IVMRMixerBitmap9 interface should help you, which is implemented by the VMR. This is the link to MSDN:

[http://msdn.microsoft.com/zh-cn/library/windows/desktop/dd390451（v = vs.85 ）.aspx] [1]

[http://msdn.microsoft.com/en-us/library/windows/desktop/dd390451(v=vs.85).aspx][1]

位图需要具有alpha值，以便可以与渲染的视频混合。

The bitmap needs to have alpha values so that it can be blended with the rendered video.

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