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Slow video output from webcam with qemu-xhci but smooth with usb-ehci
From: |
Diego Viola |
Subject: |
Slow video output from webcam with qemu-xhci but smooth with usb-ehci |
Date: |
Sat, 12 Dec 2020 13:28:39 -0300 |
Hi,
I'm experiencing a lot of choppiness in the video output when I pass
through my USB webcam to the guest using qemu-xhci as follows:
qemu-system-x86_64 -enable-kvm -hda arch-zoom.qcow2 -m 4G -vga virtio
-device qemu-xhci,id=xhci -device
usb-host,bus=xhci.0,hostdevice=/dev/bus/usb/002/004
My webcam is:
Bus 002 Device 004: ID 04f2:b449 Chicony Electronics Co., Ltd Integrated Camera
I am using mpv /dev/video0 from the guest.
It works fine if I use usb-ehci instead, e.g.:
qemu-system-x86_64 -enable-kvm -hda arch-zoom.qcow2 -m 4G -vga virtio
-device usb-ehci,id=ehci -device
usb-host,bus=ehci.0,hostdevice=/dev/bus/usb/002/004
In this case, the video output from mpv /dev/video0 is not choppy.
My QEMU version is 5.2.0 -- I am running Arch Linux on the host and guest.
Any ideas please?
Thanks,
Diego
- Slow video output from webcam with qemu-xhci but smooth with usb-ehci,
Diego Viola <=