* https://www.saillard.org/linux/pwc/# PwC
* https://www.lavrsen.dk/foswiki/bin/view/PWC/WorkingWebcamsWithPWC
* https://bugzilla.redhat.com/show_bug.cgi?id=700681#
===== 046d:08b4 Logitech, Inc. QuickCam Zoom =====
==== error: pwc: isoc_init() submit_urb 0 failed with error -28 ====
@TaG: QuickCam PwC UsB [[v4l]]
[ 346.516833] pwc: isoc_init() submit_urb 0 failed with error -28
* https://acassis.wordpress.com/2009/08/06/testing-logitech-quickcam-on-embedded-system/
* https://www.kernel.org/doc/html/v4.13/driver-api/usb/URB.html
modinfo pwc | grep parm #
parm: power_save:Turn power saving for new cameras on or off (int)
parm: leds:LED on,off time in milliseconds (array of int)
[ 7790.352389] videodev: Linux video capture interface: v2.00
[ 7790.359040] pwc: Logitech QuickCam Zoom (new model) USB webcam detected.
[ 7790.401288] pwc: Registered as video0.
[ 7790.401362] input: PWC snapshot button as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.7/input/input15
[ 7790.401547] usbcore: registered new interface driver Philips webcam
* https://www.vanheusden.com/setpwc/
* https://packages.qa.debian.org/s/setpwc.html
* http://archive.ubuntumirror.dei.uc.pt/ubuntu/pool/universe/s/setpwc/setpwc_1.3-1_amd64.deb
sudo setpwc sudo setpwc -d /dev/video0 -p
setpwc v1.3, (C) 2003-2006 by folkert@vanheusden.com
Current device: Logitech QuickCam Zoom (pwc @ usb-0000:00:1d.0-1.7)
Error while doing ioctl VIDIOCPWCPROBE: Inappropriate ioctl for device
Warning: this might not be a Philips compatible webcam!
rzr@marcel:/tmp$ sudo setpwc sudo setpwc -d /dev/video0 -p
setpwc v1.3, (C) 2003-2006 by folkert@vanheusden.com
Current device: Logitech QuickCam Zoom (pwc @ usb-0000:00:1d.0-1.7)
Error while doing ioctl VIDIOCPWCPROBE: Inappropriate ioctl for device
Warning: this might not be a Philips compatible webcam!
VIDIOCPWCPROBE returns: - 0
Error while doing ioctl VIDIOCPWCGSERIAL: Inappropriate ioctl for device
Serial number: ////////////////
Resolution (x, y): 160, 120
Framerate: 45
Brightness: Brightness
Value: 62
Minimum: 0
Maximum: 127
Step: 1
Default: 62
Flags: slider
Hue: VIDIOC_G_CTRL failed: Invalid argument
Colour: Saturation
Value: 0
Minimum: -100
Maximum: 100
Step: 1
Default: 0
Flags: slider
Contrast: Contrast
Value: 32
Minimum: 0
Maximum: 63
Step: 1
Default: 32
Flags: slider
Whiteness: Gamma
Value: 24
Minimum: 0
Maximum: 31
Step: 1
Default: 24
Flags: slider
Palette: Unknown! (842093913 - YU12)
Error while doing ioctl VIDIOCPWCGCQUAL: Inappropriate ioctl for device
Compression preference: 0
Error while doing ioctl VIDIOCPWCGAGC: Inappropriate ioctl for device
Automatic gain control: 0
Error while doing ioctl VIDIOCPWCGAWB: Inappropriate ioctl for device
Whitebalance mode: indoor
Blinking of LED is not supported by the combination
of your webcam and the driver.
Error while doing ioctl VIDIOCPWCGCONTOUR: Inappropriate ioctl for device
Sharpness: 0
Error while doing ioctl VIDIOCPWCGBACKLIGHT: Inappropriate ioctl for device
Backlight compensation mode: off
Anti-flicker mode is not supported by the combination
of your webcam and the driver.
Noise reduction mode is not supported by the combination
of your webcam and the driver.
Pan/tilt range is not supported by the combination
of your webcam and the driver.
Get pan/tilt position is not supported by the combination
of your webcam and the driver.
sudo v4l2-ctl --all -d /dev/video0
Driver Info:
Driver name : pwc
Card type : Logitech QuickCam Zoom
Bus info : usb-0000:00:1d.0-1.7
Driver version : 5.4.78
Capabilities : 0x85200001
Video Capture
Read/Write
Streaming
Extended Pix Format
Device Capabilities
Device Caps : 0x05200001
Video Capture
Read/Write
Streaming
Extended Pix Format
Priority: 2
Video input : 0 (Camera: ok)
Format Video Capture:
Width/Height : 160/120
Pixel Format : 'YU12' (Planar YUV 4:2:0)
Field : None
Bytes per Line : 160
Size Image : 28800
Colorspace : sRGB
Transfer Function : Default (maps to sRGB)
YCbCr/HSV Encoding: Default (maps to ITU-R 601)
Quantization : Default (maps to Limited Range)
Flags :
Streaming Parameters Video Capture:
Capabilities : timeperframe
Frames per second: 30.000 (30/1)
Read buffers : 2
User Controls
brightness 0x00980900 (int) : min=0 max=127 step=1 default=62 value=62 flags=slider
contrast 0x00980901 (int) : min=0 max=63 step=1 default=32 value=32 flags=slider
saturation 0x00980902 (int) : min=-100 max=100 step=1 default=0 value=0 flags=slider
white_balance_automatic 0x0098090c (menu) : min=0 max=4 default=4 value=4 flags=update
0: Indoor (Incandescant Lighting)
1: Outdoor (Sunlight) Mode
2: Indoor (Fluorescent Lighting) M
3: Manual Mode
4: Auto Mode
red_balance 0x0098090e (int) : min=0 max=255 step=1 default=128 value=144 flags=inactive, slider, volatile
blue_balance 0x0098090f (int) : min=0 max=255 step=1 default=128 value=132 flags=inactive, slider, volatile
gamma 0x00980910 (int) : min=0 max=31 step=1 default=24 value=24 flags=slider
exposure 0x00980911 (int) : min=0 max=255 step=1 default=241 value=241 flags=inactive, volatile
gain_automatic 0x00980912 (bool) : default=1 value=1 flags=update
gain 0x00980913 (int) : min=0 max=63 step=1 default=21 value=22 flags=inactive, volatile
backlight_compensation 0x0098091c (bool) : default=1 value=1
color_effects 0x0098091f (menu) : min=0 max=1 default=0 value=0
0: None
1: Black & White
band_stop_filter 0x00980921 (bool) : default=0 value=0
auto_contour 0x0098f900 (bool) : default=0 value=0 flags=update
contour 0x0098f901 (int) : min=0 max=63 step=1 default=32 value=32 flags=slider
dynamic_noise_reduction 0x0098f902 (int) : min=0 max=3 step=1 default=1 value=1
auto_white_balance_speed 0x0098f903 (int) : min=1 max=32 step=1 default=1 value=1
auto_white_balance_delay 0x0098f904 (int) : min=0 max=63 step=1 default=0 value=0
save_user_settings 0x0098f905 (button) : flags=write-only, execute-on-write
restore_user_settings 0x0098f906 (button) : flags=update, write-only, execute-on-write
restore_factory_settings 0x0098f907 (button) : flags=update, write-only, execute-on-write
046d:08b4 Logitech, Inc. QuickCam Zoom
[ 17.458486] pwc: Logitech QuickCam Zoom (new model) USB webcam detected.
[ 17.651437] pwc: Registered as video0.
[ 17.651468] input: PWC snapshot button as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.5/input/input11
[ 17.651612] usbcore: registered new interface driver Philips webcam
v4l2-ctl --all -d /dev/video0
Driver Info (not using libv4l2):
Driver name : pwc
Card type : Logitech QuickCam Zoom
Bus info : usb-0000:00:1a.0-1.5
Driver version: 4.15.18
Capabilities : 0x85200001
Video Capture
Read/Write
Streaming
Extended Pix Format
Device Capabilities
Device Caps : 0x05200001
Video Capture
Read/Write
Streaming
Extended Pix Format
Priority: 2
Video input : 0 (Camera: ok)
Format Video Capture:
Width/Height : 640/480
Pixel Format : 'YU12'
Field : None
Bytes per Line : 640
Size Image : 460800
Colorspace : sRGB
Transfer Function : Default (maps to sRGB)
YCbCr/HSV Encoding: Default (maps to ITU-R 601)
Quantization : Default (maps to Limited Range)
Flags :
Streaming Parameters Video Capture:
Capabilities : timeperframe
Frames per second: 15.000 (15/1)
Read buffers : 2
User Controls
brightness 0x00980900 (int) : min=0 max=127 step=1 default=62 value=62 flags=slider
contrast 0x00980901 (int) : min=0 max=63 step=1 default=32 value=32 flags=slider
saturation 0x00980902 (int) : min=-100 max=100 step=1 default=0 value=0 flags=slider
white_balance_automatic 0x0098090c (menu) : min=0 max=4 default=4 value=4 flags=update
red_balance 0x0098090e (int) : min=0 max=255 step=1 default=128 value=83 flags=inactive, slider, volatile
blue_balance 0x0098090f (int) : min=0 max=255 step=1 default=128 value=130 flags=inactive, slider, volatile
gamma 0x00980910 (int) : min=0 max=31 step=1 default=24 value=24 flags=slider
exposure 0x00980911 (int) : min=0 max=255 step=1 default=245 value=245 flags=inactive, volatile
gain_automatic 0x00980912 (bool) : default=1 value=1 flags=update
gain 0x00980913 (int) : min=0 max=63 step=1 default=9 value=16 flags=inactive, volatile
backlight_compensation 0x0098091c (bool) : default=1 value=1
color_effects 0x0098091f (menu) : min=0 max=1 default=0 value=0
band_stop_filter 0x00980921 (bool) : default=0 value=0
auto_contour 0x0098f900 (bool) : default=0 value=0 flags=update
contour 0x0098f901 (int) : min=0 max=63 step=1 default=32 value=32 flags=slider
dynamic_noise_reduction 0x0098f902 (int) : min=0 max=3 step=1 default=1 value=1
auto_white_balance_speed 0x0098f903 (int) : min=1 max=32 step=1 default=1 value=1
auto_white_balance_delay 0x0098f904 (int) : min=0 max=63 step=1 default=0 value=0
save_user_settings 0x0098f905 (button) : flags=write-only, execute-on-write
restore_user_settings 0x0098f906 (button) : flags=update, write-only, execute-on-write
restore_factory_settings 0x0098f907 (button) : flags=update, write-only, execute-on-write
==== workaround: =====
@TaG: UdeV
#!/bin/sh
set -e
set -x
# /etc/udev/rules.d/99-local-webcam.rules
sudo=echo
$sudo sync
$sudo modprobe -r pwc
$sudo modprobe -v pwc
#DISPLAY=
dev=/dev/video0
v4l2-ctl --all -d $dev > /tmp/v4l.pre.log
killall firefox ||:
/usr/bin/v4l2-ctl --set-fmt-video=width=640,height=480,pixelformat=1 --device $dev
mplayer -vo caca tv:// -tv driver=v4l2:width=640:height=480:device=/dev/video0 -ss 0 -endpos 0:0:10 &
sleep 2
killall mplayer
firefox "https://app.element.io/#/room/!sedVLwgTGMxqyOfbVn:matrix.org"
file=/etc/udev/rules.d/99-video4linux.rules
ls -l $file || { cat< /tmp/v4l.post.log
diff -u /tmp/v4l.pre.log /tmp/v4l.post.log > /tmp/v4l.diff
v4l2-ctl -d $dev --list-formats > /tmp/formats.log
===== ERROR =====
demsg
[ 207.147221] pwc: isoc_init() submit_urb 0 failed with error -28
ENOSPC 28 /* No space left on device */
* https://github.com/torvalds/linux/blob/v4.15/drivers/media/usb/pwc/pwc-if.c#L453
DISPLAY= sudo mplayer -vo caca tv:// -tv driver=v4l2:width=160:height=120:device=/dev/video0
DISPLAY= sudo mplayer -vo caca tv:// -tv driver=v4l2:width=640:height=480:device=/dev/video0
@TaG: UrB