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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
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It will download and install the required prereqs,
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- Now download the
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sudo apt-get install subversion
- Now download the library using the following command
svn co http://v4l4j.googlecode.com/svn/v4l4j/trunk v4l4j-trunk
- 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
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- directory (cd v4l4j-
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- 0.x.x) and start the build process by typing the command shown below
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- 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
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- On Wheezy beta: (Raspberry Pi)
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- :
JDK_HOME=/usr/lib/jvm/java-7-openjdk-armhf/ LIBPIXFC=pixfc-sse/libpixfc-sse-armv6l-softfp.a ant clean all
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- On other environments setup:
Setup JDK_HOME environment variable to your JDK path and
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If you get this error "error: libv4lconvert.h: No such file or directory" , type
sudo 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
