V4L2较V4L有较大的改动，并已成为2.6的标准接口，函盖video\dvb\FM...，多数驱动都在向V4l2迁移。更好地了解V4L2先从应用入手，然后再深入到内核中结合物理设备／接口的规范实现相应的驱动。本文先就V4L2在视频捕捉或camera方面的应用框架。-V4L2 greater than V4L changes, and has become the standard interface 2.6, cover the video \ dvb \ FM ..., most drivers have migrated to the V4l2. Better understanding of the application V4L2 start start, and then deep into the core in combination with physical device/interface to the realization of the corresponding drive. This article first on the V4L2 video capture or camera in the application framework.