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Frequently Asked Questions
- Will DVI2USB Duo work with USB 1.0 or USB 1.1?
- How can I verify whether my system has USB 2.0?
- How many frames per second can DVI2USB Duo capture?
- Does DVI2USB Duo reduce the resolution of the images it captures in order to transfer it over the USB bus?
- Can DVI2USB Duo work on Windows NT, Windows 3.x/95/98/SE/ME?
- The video mode that I am using is not listed in the list of supported modes for DVI2USB Duo. Can DVI2USB Duo capture it?
- What Linux kernel does DVI2USB Duo support? Is the driver's code open source?
- Can DVI2USB Duo save captured signals as a movie?
- Which AVI codec works best with DVI2USB Duo?
- Images grabbed from some sources appear to be slightly shifted right or left. How this can be fixed?
- Can DVI2USB Duo capture VGA signals?
- Can I connect two or more DVI2USB Duo to one computer and capture signals simultaneously? What is the resulting rate of capture for each DVI2USB Duo?
- Can DVI2USB Duo capture single-link DVI signals?
- What does HDCP Ready mean? Can DVI2USB Duo acquire HDCP encrypted signals?
No, DVI2USB transfers substantial amounts of data for each captured frame. As USB 1.0 buses are very slow (12Mb/s), they do not provide sufficient bandwidth for DVI2USB. USB 2.0 have a much higher transfer rate (up to 480Mb/s), which allows DVI2USB acquire and transfer several frames per second.
Please use this procedure to verify that your system has USB 2.0.
DVI2USB Duo can capture at a frame rate of 30 frames per second at any resolution up to 2048x2048.
No. DVI2USB Duo captures and transfers every pixel of the original VGA 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.
No. Unfortunately, some of those systems have very poor support or no support at all for the USB 2.0 bus.
Please contact us. We are always looking for ways to improve our system and may be willing to add support for this mode.
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.
Yes, DVI2USB Duo can save captured still signals as AVI files.
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.
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. Please use the procedure described on this image to correct cropping.
No.DVI2USB Duo can only capture single-link and dual-link DVI signals.
Yes, you can connect two or more DVI2USB Duo devices and capture multiple signals simultaneously. You will need to run the DVI2USB 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 possible frame rate. Please note that you must start the DVI2USB application after connecting each DVI2USB Duo.
Yes, DVI2USB Duo has the ability to capture single-link and dual-link DVI signals at a frame rate of 30fps.
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.