V4L2CAPVBICAPTURE

V4L2CAPVBICAPTURE is a Linux kernel module that provides support for capturing video data from specific types of video input devices. The acronym V4L2 stands for Video4Linux2, which is the standard API for video capture in Linux. CAP is likely short for capture, and VBI refers to Vertical Blanking Interval. The Vertical Blanking Interval is a period when a television screen is not drawing an image, and it traditionally carried additional data like teletext or closed captions. Therefore, V4L2CAPVBICAPTURE is designed to access and process this VBI data alongside the main video stream.

This module is crucial for applications that require not only the visual content but also metadata embedded within the VBI. Examples include extracting closed captions for accessibility features, decoding teletext information, or capturing other time-sensitive data transmitted during the vertical blanking period. The module integrates with the V4L2 framework, allowing user-space applications to interact with the hardware through the familiar V4L2 ioctls. This ensures compatibility with existing video capture software and tools. The availability and functionality of V4L2CAPVBICAPTURE depend on the specific hardware driver and the capabilities of the video capture device itself.