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Datapath video capture cards

This page is updated to the 2.0.0 release

Drivers & information

Datapath cards are VGA and DVI capturing devices. They capture up to 1080p DVI and 2048x1536 analog. They also provide a blank signal when signal is missing and scales the resolution if a change occur.

Technical data

  • Vendor: Datapath
  • Models VisionRGB-E1S
  • Resolution: upto Full HD
  • Format: YUV or JPEG
  • Connector: DVI
  • Signal: RAW
  • Drivers: available here
  • Plugin: v4l2
  • Price: around 650 €

Driver installation

Links and instructions to install the linux driver for Datapath are available at https://www.datapath.co.uk/datapath-current-downloads/linux

To install the driver unpack the zipped tarball and execute the script at scripts/install.kernel as root. Further information can be found in the installation help file, docs/INSTALL.

To uninstall the driver execute scripts/uninstall.sh

Device identification

  1. Find the Device name attribute:
  • udevadm info --attribute-walk --name=/dev/video0 | grep name
    • rgb133 (0-0)
  1. Fix access path
  • With sudo create or modify the file /etc/udev/rules.d/galicaster.rules
  • Add the line: KERNEL=="video[0-9]*", ATTR{name}=="rgb133 (0-0)", GROUP="video", SYMLINK+="screen"

Device configuration

Module configuration

Admitted values:

  • name: Name assigned to the device.
  • device: Device type: v4l2
  • flavor: Matterhorn "flavor" associated to the track. (presenter|presentation|other)
  • location: Device's mount point in the system (e.g. /dev/screen).
    • In this plugin this parameter is merely informative.
  • file: The file name where the track will be recorded. (default:CAMERA.avi)
  • videocrop: Margin in pixels to be cutted. Useful to set a 4:3 proportion on a HD webcam. videocrop-top, videocrop-bottom, videocrop-left, videocrop-right (optional).
  • caps: GStreamer cappabilities of the device (mimetype=TYPE, framerate=X/Y,width=A,height=B)

Caps magic:

  • type: video/x-raw
  • framerate: 30/1, 25/1, 10/1 ... **. Datapath provides an stable 30 fps, lower framerates will decimate the input signal accordingly.
  • resolution:
    • width=800,height=600, width=640,height=480, width=1024,height=768
    • panorarmic: width=1280,height=720 or width=1920,height=1080
  • Use guvcview to know wich capabilities are compatible with your device.

Example:

[track1]
name = Datapath
device = datapath
flavor = presentation
location = /dev/screen
file = SCREEN.avi
caps = video/x-raw,framerate=30/1,width=1280,height=720
videocrop-left = 0
videocrop-right = 0

Troubleshooting

16:9 resolutions aspect is deformed You should establish a 16:9 resolution on the configuration. Changing sources of different aspect ratios will deform one type or another.

When I resume a recording after pausing without signal it fails Unfortunatelly, the absence of singal after pause make the driver fails. To avoid losing signal use a VGA scaler with signal replacement cappabilities

If the connector is unplugged several times the recording fails Update your driver to the newest one. Old drivers didn't handled unplugging efficiently.

FAQ

  1. Can I change the NO SIGNAL message?
    Yes, you can modifying the driver configuration. When the driver is installed a sample with instruction is placed at etc/modprobe.d/rgb133.sample.conf