NAME

       dv4l - make a dv1394 camcorder available for video4linux programs

SYNOPSIS

       dv4l [options]

       options (shortest form): [-cdrsvh]

DESCRIPTION

       dv4l  enables  programs  using the video4linux API to access a dv1394 (Firewire) camcorder. It pushes the
       video stream to an input device provided by the vloopback kernel module.

       Before starting dv4l , make sure that the vloopback module is present in the kernel.

       See  http://www.lavrsen.dk/twiki/bin/view/Motion/VideoFourLinuxLoopbackDevice  (without  the  dash)   for
       information about this kernel module.

       Check your 1394 driver config by starting

         $ gst-launch-0.10 dv1394src \! dvdemux \! dvdec \!  xvimagesink

       from  your shell. After turning on your camera, a video window should appear.  If this works, dv4l should
       work as well.

       Make sure that your camera is on before starting a video4linux program.

OPTIONS

       -c, --color-correction
              Set this option if red objects look blue.

       -d, --device device-name
              Use device-name as vloopback input device. If this option is omitted, dv4l will automatically look
              for an appropriate device.

       -r, --rgb-only
              Set this option to prevent V4L applications from choosing YUV palettes. Try this option if you get
              low frame rates.

       -s, --size WxH
              Set capture size and use slower copy mode, only required for some  V4L  applications.  When  using
              this option, V4L applications can't change the capture size.

       -v, --verbose level
              Set  the  amount  of  debugging messages. A level of 0 means no output at all, 1 is the default, 3
              enables all messages.

       -h, --help
              displays a help message

EXAMPLES

       In most cases, dv4l can be started without any options. Kopete, however needs the --size option,  with  a
       resolution of 320x240:

         dv4l -s 320x240

       Like kopete, gqcam needs the --size option, but supports arbitrary resolutions:

         dv4l -s 635x360

       dv4l will do the scaling.

LIMITATIONS

       dv4l does not support adjustment of color, brightness and similar parameters.

       It  supports  only  RGB24  and YUV420P palettes. Some V4L programs may not work as they require different
       palettes.

       It supports only a single dv1394 camera.

       Skype v2.0beta seems to have problems with vloopback and does NOT work with dv4l. Try dv4lstart instead.

SEE ALSO

       dv4lstart(1)

                                                                                                         DV4L(1)