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+<think>
+Okay, let me try to figure out how to classify this bug report. The user is having trouble with their QEMU setup where a USB3 video capture device isn't working correctly in a Windows 10 guest. They mention that when using the xhci driver in QEMU, they get blank frames, but it works fine when using VT-d (which I think is Intel's Virtualization Technology for Directed I/O, allowing direct assignment of hardware to the VM).
+
+So, the problem occurs specifically with the xHCI host controller emulation in QEMU. The user suspects this because when they bypass QEMU's USB handling and use VT-d instead, it works perfectly. They provided details about how their setup is configured, including command lines for both working and non-working scenarios.
+
+Looking at the possible categories: Mistranslation, assembly lowering, other, device, graphic, socket, network, KVM, boot, vnc, debug, files, permissions, performance, kernel, peripherals, hypervisor.
+
+Since the issue is with the xHCI driver in QEMU not handling USB3 devices properly, it's related to hardware device emulation. The user is trying to use a USB capture device, which falls under peripheral devices. The fact that it works when using VT-d suggests that the problem lies within QEMU's own USB handling rather than the hypervisor or other components.
+
+Therefore, the category should be 'device' because it pertains to how QEMU handles USB3 devices via xHCI.
+</think>
+
+The bug is related to device emulation in QEMU, specifically with the xHCI host controller not correctly handling a USB3 video capture device. The issue is isolated to the USB device interaction within the virtual environment.
+
+Answer: device
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