Black video using multiple instances of VMR 9

Question

I am working on creating a video wall as an application. The application creates several windows for displaying video, and each window has its own filter schedule. In a typical configuration, these windows will be distributed across two displays for a total of 12 windows.

But the problem is that whenever I try to start the application, some of the windows show a black video. There are no crashes, and each graph is displayed correctly, without any errors. Windows displaying black video are random.

I tested this on two different graphics cards with similar results.

Someone can help identify the problem.

Answer 1

VMR9s / EVR are supported by a limited resource, you reach the limit. There is no distinctive error code or otherwise well-known / reliable way to detect that you have problems.

In your workaround, you can either implement a custom distributor / presenter for controlling surfaces, or use VMR7 instead.

See also:

• StressEvr: So how much EVR can you do? using a small tool / test bench to find out how many instances you can create, VMR7 / EVR, at specific resolutions and pixel formats