DVI2USB Duo Frequently Asked Questions

DVI2USB Duo is a compact, external video grabber designed to capture dual-link DVI signals. It easily captures video and images with resolutions of up to 2048×2048 (2560×1600 in wide screen mode) and up to 60 fps, depending on the input source.

Will DVI2USB Duo work with USB 1.0 or USB 1.1?

No. DVI2USB Duo transfers substantial amounts of data for each captured frame. As USB 1.0 buses are very slow (12 Mb/s), they do not provide sufficient bandwidth for DVI2USB Duo. USB 2.0 have a much higher transfer rate (up to 480 Mb/s), which allows DVI2USB Duo to capture and transfer several frames per second.

How can I verify whether my system has USB 2.0?

To verify that your system has USB 2.0 follow the steps below:

  1. On the capture computer running Windows, click Start; a list of options appears.
  2. Right click on the Computer option; a drop-down menu appears.
  3. Choose Properties; a Control Panel Home window opens
  4. Choose Device Manager from the side menu; a window listing the available devices opens.
  5. Expand the Universal Serial Bus controllers option; a list appears indicating the version of the USB.

How many frames per second can DVI2USB Duo capture?

DVI2USB Duo can capture at a frame rate of up to 60 frames per second, depending on resolution and source content..

Does DVI2USB Duo reduce the resolution of the images it captures in order to transfer it over the USB bus?

No. DVI2USB Duo captures and transfers every pixel of the original frame in 24-bits-per-pixel, 8:8:8 format. In this respect, DVI2USB Duo provides diagnostic-quality images – superior to other solutions such as S-video conversion.

Can DVI2USB work on Windows NT, Windows 3.x/95/98/SE/ME?

No. Unfortunately, these systems have poor support or no support at all for the USB 2.0 bus.

The video mode that I am using is not listed in the list of supported modes for DVI2USB Duo. Can DVI2USB Duo capture it?

Please contact us. We are always looking for ways to improve our system and may be willing to add support for this mode.

What Linux kernel does DVI2USB Duo support? Is the driver's code open source?

Although we provide a Linux SDK (API for driver and examples), we do not provide source code for the driver itself. Please contact us if you need a driver compiled for a specific kernel version or kernel setting.

Which AVI codec works best with DVI2USB Duo?

Choice of codec and codec settings depends on the requirements for the quality of the AVI. You may need to try several codecs with different settings to see which codec fits the best for your task. We suggest the Indeo 5.10 codec with 50% quality settings as a good compromise between compression rate, image quality and required CPU power.

Images grabbed from some sources appear to be slightly shifted right or left. How this can be fixed?

DVI2USB Duo has an automatic algorithm that crops visible image from the DVI frame. The algorithm may make a mistake, however, and be off by a few pixels. Refer to the image below for steps to correct cropping. Crop images

Can DVI2USB Duo capture VGA signals?

No.DVI2USB Duo captures single-link, dual-link DVI and HDMI™ signals.

Can I connect two or more DVI2USB Duo devices to one computer and capture signals simultaneously?

Yes. You can connect two or more DVI2USB Duo devices and capture multiple signals simultaneously. You will need to run the DVI2USB Duo application for each DVI2USB Duo device attached. However, you will notice a significant difference in the frame rate for each additional active DVI2USB Duo. The higher the performance of your computer, the better the frame rate. Note: You must start the DVI2USB Duo application after connecting each DVI2USB Duo.

Can DVI2USB Duo capture single-link DVI signals?

Yes. DVI2USB Duo can capture single-link and dual-link DVI signals at a frame rate of up to 60 fps.

What does HDCP Ready mean? Can DVI2USB Duo acquire HDCP encrypted signals?

High-bandwidth Digital Content Protection (HDCP) is a form of digital copy protection developed by Intel Corporation to protect digital audio and video content as it travels across DisplayPort, Digital Visual Interface (DVI), High-Definition Multimedia Interface (HDMI), Gigabit Video Interface (GVIF), or Unified Display Interface (UDI) connections. The specification is proprietary, and implementing HDCP requires a license.

HDCP is licensed by Digital Content Protection, LLC, a subsidiary of Intel. In addition to an annual fee, licensed adopters agree to the conditions set forth in the HDCP License Agreement. For example, high-definition digital video sources must not transmit protected content to non-HDCP compliant receivers. Additionally, DVD-Audio content is restricted to CD-Audio quality or less on non-HDCP digital audio outputs (analog audio outputs have no quality limits). Licensed adopters cannot allow their devices to make copies of content, and must design their products in ways that “effectively frustrate attempts to defeat the content protection requirements.” The technology sometimes causes handshaking problems, especially with older high-definition displays.

For more information on HDCP contact http://www.digital-cp.com/

Yes, OEM customers with HDCP license rights may engage Epiphan to build DVI2USB Duo OEM devices with the ability to capture HDCP encrypted DVI signals provided the user has an appropriate license to acquire the decryption key and agrees to comply with the terms of the HDCP license agreements.