@TaG: [[ov]] [[API]] [[Video]] [[Linux]] [[jingle]] [[skype]] PwC WebCam

  * https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/dev-encoder.html

===== HARDWARE ======

@TaG WebCam CT6840 Creative

<code>
05a9:a511 OmniVision Technologies, Inc. OV511+ Webcam


sudo apt install v4l-utils

v4l2-ctl --all -d /dev/video2  
Driver Info:
	Driver name      : ov519
	Card type        : USB Camera (05a9:a511)
	Bus info         : usb-0000:00:14.0-1
	Driver version   : 5.0.8
	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 (ov519: ok)
Format Video Capture:
	Width/Height      : 640/480
	Pixel Format      : 'O511' (GSPCA OV511)
	Field             : None
	Bytes per Line    : 640
	Size Image        : 614400
	Colorspace        : JPEG
	Transfer Function : Default (maps to sRGB)
	YCbCr/HSV Encoding: Default (maps to ITU-R 601)
	Quantization      : Default (maps to Full Range)
	Flags             : 
Streaming Parameters Video Capture:
	Frames per second: invalid (0/0)
	Read buffers     : 2

User Controls

                     brightness 0x00980900 (int)    : min=0 max=255 step=1 default=127 value=127 flags=inactive, slider
                       contrast 0x00980901 (int)    : min=0 max=255 step=1 default=127 value=127 flags=slider
                     saturation 0x00980902 (int)    : min=0 max=255 step=1 default=127 value=127 flags=slider
           power_line_frequency 0x00980918 (menu)   : min=0 max=2 default=0 value=0
           brightness_automatic 0x00980920 (bool)   : default=1 value=1 flags=update
</code>




===== todo =====

  * http://forum.ubuntu-fr.org/viewtopic.php?pid=2468450#p2468450
  * https://www.spinics.net/lists/vfl/msg17368.html


==== tools ====

  mplayer tv:// -tv driver=v4l2:width=640:height=480:device=/dev/video0
  mplayer tv:// -tv driver=v4l2:width=320:height=240:device=/dev/video0


==== cinelerra ====

<code>
Cinelerra 2.1CV (C) 2006 Heroine Virtual Ltd.
Compiled on dimanche 6 juillet 2008, 19:01:47 (UTC+0200)

Cinelerra is free software, covered by the GNU General Public License,
and you are welcome to change it and/or distribute copies of it under
certain conditions. There is absolutely no warranty for Cinelerra.
RecordMonitorCanvas::RecordMonitorCanvas 1 0 35 295 465
VDeviceV4L::ioctl VIDIOCGAUDIO: Invalid argument
VDeviceV4L::ioctl VIDIOCSAUDIO: Invalid argument
VDeviceV4L::v4l_init mmap: Invalid argument
</code>

  * http://cinelerra.org/docs/cinelerra_cv_manual_en.html#SEC79


==== camorama ====

  * http://bugs.debian.org/390218


I wanted to confirm that the bug is still present in camorama, or ov51x-jpeg driver

I just tested with latests versions and It's the same behaviour see screenshot while it works with [[vlc]] :



ToRead :

  * http://wwww.poisson.free.fr/www.rzr.online.fr/cache/docs/ddk-2.6.16.18.iso/Documentation/DocBook/videobook/index.html

{{http://rzr.online.fr/docs/contribs/files/desktop-20080116.png}}

@url: http://rzr.online.fr/q/v4l



==== webcam grab ====

  mencoder tv:// -tv driver=v4l:width=640:height=480:fps=25:device=/dev/video0 -ovc raw -o /tmp/tmp.avi
  ...
  tv.c: norm_from_string(pal): Bogus norm parameter, setting default.
  Unknown norm!
  Error: Cannot set norm!
  Selected input hasn't got a tuner!
  [V] filefmt:9  fourcc:0x32315659  size:640x480  fps:25.000  ftime:=0.0400
  ...
  80 duplicate frame(s)!
  Pos:   3.3s      2f ( 0%)  0.00fps Trem:   0min   0mb  A-V:0.000 [2247:0]
  ...


===== errors =====

  unable to open '/dev/video0': No such file or directory


  find /lib/modules/$(uname -r)/ -iname "*v4l*"
/lib/modules/2.6.32-5-686/kernel/drivers/media/video/v4l2-int-device.ko
/lib/modules/2.6.32-5-686/kernel/drivers/media/video/v4l2-common.ko
/lib/modules/2.6.32-5-686/kernel/drivers/media/video/v4l1-compat.ko

  modprobe -v v4l2-int-device v4l1-compat


===== MISC =====

  * https://github.com/ammen99/wf-recorder/wiki#using-wf-recorder-as-camera#