Installing V4l4j

For the ucam handler to work two things are needed, the video driver of the camera which comes by default and the v4l4j library. The steps below show installing of v4l4j library
Steps:

• Before installing the v4l4j some packages are needed to be installed. If you are running debian based operating system type the command

sudo apt-get install openjdk-7-jdk ant libjpeg8-dev

It will download and install the required prereqs,
 

• Now download the latest version of the library (v4l4j-0.x.x.tar.gz) from the following link https://code.google.com/archive/p/v4l4j/downloads
• Then go to the v4l4j directory (cd v4l4j-0.x.x) and start the build process by typing the command shown below
  On Raspbian Wheezy (Raspberry pi):
        JDK_HOME=/usr/lib/jvm/java-7-openjdk-armhf/ LIBPIXFC=pixfc-sse/libpixfc-sse-armv6l-hardfp.a ant clean all
  On Wheezy beta: (Raspberry Pi):
        JDK_HOME=/usr/lib/jvm/java-7-openjdk-armhf/ LIBPIXFC=pixfc-sse/libpixfc-sse-armv6l-softfp.a ant clean all
   On other environments setup:
        Setup JDK_HOME environment variable to your JDK path and do ant clean all

 If you get this error "error: libv4lconvert.h: No such file or directory" , type

                                       sudo apt-get install libv4l-dev

And do the build process again.

• Once the build process is completed

• Install by running command

                                      sudo ant install

• Finally test the library by running command
                                  ant test-fps