Arch Linux

pwouik

Member

Registered: 2025-02-08

Posts: 9

webcam no longer working

My webcam no longer work

At first it was working fine,

Then it was crashing after a few frames when using v4l2 (ffplay /dev/video* ,browsers), OBS did works with pipewire
When trying with ffplay I was getting "No such device" error and /dev/video0 was replaced by /dev/video2

Then after a system update it fail immediately, OBS with pipewire doesn't works either

~ v4l2-ctl --list-devices
HP HD Camera: HP HD Camera (usb-0000:00:14.0-2):
	/dev/video4
	/dev/video5
	/dev/media0

~ ffplay /dev/video4
ffplay version n8.0.1 Copyright (c) 2003-2025 the FFmpeg developers
  built with gcc 15.2.1 (GCC) 20251112
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-frei0r --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libdvdnav --enable-libdvdread --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgsm --enable-libharfbuzz --enable-libiec61883 --enable-libjack --enable-libjxl --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libplacebo --enable-libpulse --enable-librav1e --enable-librsvg --enable-librubberband --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpl --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-vapoursynth --enable-version3 --enable-vulkan
  libavutil      60.  8.100 / 60.  8.100
  libavcodec     62. 11.100 / 62. 11.100
  libavformat    62.  3.100 / 62.  3.100
  libavdevice    62.  1.100 / 62.  1.100
  libavfilter    11.  4.100 / 11.  4.100
  libswscale      9.  1.100 /  9.  1.100
  libswresample   6.  1.100 /  6.  1.100
[video4linux2,v4l2 @ 0x7f31e8000d00] The V4L2 driver changed the video from 1280x720 to 640x480
[video4linux2,v4l2 @ 0x7f31e8000d00] ioctl(VIDIOC_STREAMON): Protocol error
/dev/video4: Protocol error
    nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B

webcam: ID 0408:5374 Quanta Computer, Inc. HP HD Camera

pwouik

Member

Registered: 2025-02-08

Posts: 9

Re: webcam no longer working

After removing all dkms modules and restarting I am back to the previous errors:

~ v4l2-ctl --list-devices
HP HD Camera: HP HD Camera (usb-0000:00:14.0-2):
	/dev/video0
	/dev/video1
	/dev/media0
➜  ~ ffplay /dev/video0
ffplay version n8.0.1 Copyright (c) 2003-2025 the FFmpeg developers
  built with gcc 15.2.1 (GCC) 20251112
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-frei0r --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libdvdnav --enable-libdvdread --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgsm --enable-libharfbuzz --enable-libiec61883 --enable-libjack --enable-libjxl --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libplacebo --enable-libpulse --enable-librav1e --enable-librsvg --enable-librubberband --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpl --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-vapoursynth --enable-version3 --enable-vulkan
  libavutil      60.  8.100 / 60.  8.100
  libavcodec     62. 11.100 / 62. 11.100
  libavformat    62.  3.100 / 62.  3.100
  libavdevice    62.  1.100 / 62.  1.100
  libavfilter    11.  4.100 / 11.  4.100
  libswscale      9.  1.100 /  9.  1.100
  libswresample   6.  1.100 /  6.  1.100
[video4linux2,v4l2 @ 0x7fdb70000d00] The V4L2 driver changed the video from 1280x720 to 640x480
[video4linux2,v4l2 @ 0x7fdb70000d00] ioctl(VIDIOC_DQBUF): Invalid argument
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, bitrate: 147456 kb/s
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 147456 kb/s, 30 fps, 30 tbr, 1000k tbn
[video4linux2,v4l2 @ 0x7fdb70000d00] ioctl(VIDIOC_DQBUF): No such device
    Last message repeated 1 times
[video4linux2,v4l2 @ 0x7fdb70000d00] ioctl(VIDIOC_DQBUF): No such device
    Last message repeated 2 times
[video4linux2,v4l2 @ 0x7fdb70000d00] ioctl(VIDIOC_DQBUF): No such device
    Last message repeated 2 times
[video4linux2,v4l2 @ 0x7fdb70000d00] ioctl(VIDIOC_DQBUF): No such device
    Last message repeated 2 times
[video4linux2,v4l2 @ 0x7fdb70000d00] ioctl(VIDIOC_DQBUF): No such device
    Last message repeated 2 times
[video4linux2,v4l2 @ 0x7fdb70000d00] ioctl(VIDIOC_DQBUF): No such device
    Last message repeated 2 times
[video4linux2,v4l2 @ 0x7fdb70000d00] ioctl(VIDIOC_DQBUF): No such device
    Last message repeated 2 times
[video4linux2,v4l2 @ 0x7fdb70000d00] ioctl(VIDIOC_DQBUF): No such device
    Last message repeated 2 times
[video4linux2,v4l2 @ 0x7fdb70000d00] ioctl(VIDIOC_DQBUF): No such device
^C%