It then describes VirtIO Video: the protocol that has been making fast video encoding and decoding possible on Chrome OS for Android applications through ARCVM. It is the responsibility of the VirtIO Video’s kernel driver to convert the original V4L2 IOCTLs into valid VirtIO Video commands that can be acted upon by the host device running inside the virtual machine manager. As VirtIO Video is precisely a paravirtualized device, it is used by CrosVM to share the video codec hardware available in the Chromebook to Android guests.