[Qemu-devel] [Bug 1077708] [NEW] Video capture from webcam with USB passthrough freezes

[Tristan Schmelcher]

Public bug reported:

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

** Affects: qemu
     Importance: Undecided
         Status: New

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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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