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[Qemu-devel] [Bug 1077708] Re: Video capture from webcam with USB passth
From: |
Tristan Schmelcher |
Subject: |
[Qemu-devel] [Bug 1077708] Re: Video capture from webcam with USB passthrough freezes |
Date: |
Sun, 11 Nov 2012 21:10:53 -0000 |
The problem also occurs with the generic Microsoft webcam drivers.
Note that, during webcam use, these messages are output from QEMU
sporadically:
USBDEVFS_DISCARDURB: Invalid argument
USBDEVFS_DISCARDURB: Invalid argument
husb: leaking iso urbs because of discard failure
USBDEVFS_DISCARDURB: Invalid argument
USBDEVFS_DISCARDURB: Invalid argument
husb: leaking iso urbs because of discard failure
USBDEVFS_DISCARDURB: Invalid argument
USBDEVFS_DISCARDURB: Invalid argument
husb: leaking iso urbs because of discard failure
USBDEVFS_DISCARDURB: Invalid argument
USBDEVFS_DISCARDURB: Invalid argument
USBDEVFS_DISCARDURB: Invalid argument
husb: leaking iso urbs because of discard failure
However, the timing of the messages is completely uncorrelated with the
video freezes, so I am uncertain as to whether they are related or not.
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https://bugs.launchpad.net/bugs/1077708
Title:
Video capture from webcam with USB passthrough freezes
Status in QEMU:
New
Bug description:
QEMU version: 1.2.0
Graphics: Spice
Guest: Windows 7 32-bit
Host: Ubuntu 12.10 amd64 (using distro package qemu-kvm-spice)
I am using USB 2.0 passthrough of a Logitech C920 webcam. The guest is
running the proprietary Logitech drivers. When video chatting with
either Google+ Hangouts or Skype 3.8.0.115, video capture from the
webcam is initially fine but eventually freezes. It remains frozen for
up to several minutes and then resumes on its own. The process then
repeats. Audio recorded from the webcam's mic works continuously.
The problem also affects video recording in Logitech's bundled
software. Strangely though, the live preview is _not_ affected. The
freezing is only present in the recorded video file.
I can tell that the problem is not introduced by Spice during
playback, because the user on the other end of Hangouts/Skype sees the
same problem, and the freezes in a recorded video file are seen at the
same point every time the file is played.
Command line:
/usr/bin/kvm-spice -name Windows7 -S -M pc-1.0 -enable-kvm -m 2048
-smp 3,sockets=3,cores=1,threads=1 -uuid
cfcc7e85-7873-1c32-0a00-d1c35f3eb073 -no-user-config -nodefaults
-chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/Windows7.monitor,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime
-no-shutdown -device ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x6.0x7
-device ich9-usb-
uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x6
-device ich9-usb-
uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x6.0x1 -device ich9
-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x6.0x2 -drive
file=/data/libvirt/images/Windows7.img,if=none,id=drive-
ide0-0-0,format=raw -device ide-hd,bus=ide.0,unit=0,drive=drive-
ide0-0-0,id=ide0-0-0,bootindex=1 -drive if=none,id=drive-
ide0-1-0,readonly=on,format=raw -device ide-cd,bus=ide.1,unit=0,drive
=drive-ide0-1-0,id=ide0-1-0 -netdev tap,fd=21,id=hostnet0 -device
rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:7e:0b:d9,bus=pci.0,addr=0x3
-chardev pty,id=charserial0 -device isa-
serial,chardev=charserial0,id=serial0 -device usb-tablet,id=input0
-spice port=5900,addr=127.0.0.1,disable-ticketing -vga std -device
intel-hda,id=sound0,bus=pci.0,addr=0x4 -device hda-
duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device usb-
host,hostbus=2,hostaddr=8,id=hostdev0 -device virtio-balloon-
pci,id=balloon0,bus=pci.0,addr=0x5
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