Video/audio capture with PCI Express frame grabber

October 25, 2013 // By Julien Happich
Sensoray has added the Model 810, PCI Express 4-channel frame grabber to its portfolio, with audio capture, capable of simultaneously capturing four channels of analogue NTSC/PAL video and four channels of stereo audio.

The card captures raw video frames from each channel at up to full frame rate, resulting in an aggregate frame capture rate of up to 120 fps for NTSC and 100 fps for PAL. The high frame capture rate, through a single-lane x1 PCI Express interface, makes it well-suited for applications that require uncompromising capturing of multi-channel video/audio sources in a PCI Express form factor, such as broadcast-grade video/audio capturing, video surveillance, law enforcement, and traffic monitoring.

Four BNC connectors are available on the board's mounting bracket for connecting external composite video sources. A DB15 connector on the same bracket is used for the audio inputs. A 34-pin header provides an alternative convenient access to all I/O signals on the board. Video, Audio, and VBI support The unit supports a wide range of video capture resolutions, including D1, VGA, QVGA, QQVGA, SIF, 2SIF, 4SIF, CIF, QCIF, SQCIF and 4CIF. Captured frames are formatted as raw RGB or YUV.

3rd party and/or OSS CODECs can be used for compressed video/audio capture. The audio can be stereo or mono, and the sampling rate supports 32 kHz, 44.1 kHz, and 48 kHz. Embedded data may be added to each frame during the vertical blanking interval (VBI). Since the display is inactive during this interval, it can be used to transmit time codes, closed captioning, teletext, CGMS-A copy-protection indicators, and various data encoded by the XDS protocol.