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+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.
+
+libv4lconvert offers functions to convert from any (known) pixel-format
+to V4l2_PIX_FMT_BGR24 or V4l2_PIX_FMT_YUV420.
+
+libv4l1 offers the (deprecated) v4l1 API on top of v4l2 devices, independent
+of the drivers for those devices supporting v4l1 compatibility (which many
+v4l2 drivers do not).
+
+libv4l2 offers the v4l2 API on top of v4l2 devices, while adding for the
+application transparent libv4lconvert conversion where necessary.
+
+WWW: http://hansdegoede.livejournal.com/3636.html