VMR9 can not used

[brucemok]

In DirectX 9, the Video Mixing Renderer 9 (VMR-9) filter offers advanced video rendering capabilities on all platforms supported by DirectX. It is fully integrated with DirectX 9 3D capabilities.

I run a simple application which use VMR9 (vmr9allocator), can not work normal.

The Guest and Host are both Win10, the display adapter are VBoxSVGA, the version of VirtualBox and Guest Additions are 6.1.30

[scottgus1]

Start the VM from full normal shutdown, not save-state. Run until you see the problem happen, then shut down the VM from within the VM's OS if possible. If not possible, close the Virtualbox window for the VM with the Power Off option set.

Right-click the VM in the main Virtualbox window's VM list, choose Show Log. Save the far left tab's log and the hardening log next to it, zip them, and post the zip file, using the forum's Upload Attachment tab.