v4l-utils is a collection of various video4linux (V4L) and DVB utilities.

libv4l is a collection of libraries which adds a thin abstraction layer on
top of video4linux2 devices. The purpose of this (thin) layer is to make it
easy for application writers to support a wide variety of devices without
having to write separate code for different devices in the same class. libv4l
consists of 3 different libraries: libv4lconvert, libv4l1 and libv4l2.