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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 and 1.1 buses have a much higher transfer rate (up to 480Mb/s), which allows DVI2USB acquire and transfer several frames per second.

2. How can I verify whether my system has USB 2.0?

Please use this procedure to verify that your system has USB 2.0.

3. How many frames per second can DVI2USB capture?

It depends on the resolution of your screen, the screen refresh rate, operation system and the speed of the computer that is acquiring the images. Read the product Specifications for a table of refresh rates.

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

No. DVI2USB captures and transfers every pixel of the original VGA frame in 24-bits-per-pixel, 8:8:8 format. In this respect, DVI2USB provides diagnostic-quality images - superior to other solutions such as S-video conversion. You can see comparisons of screen shots taken with DVI2USB here.

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

No. Unfortunately, some of those systems have very poor support or no support at all for the USB 2.0 bus.

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

7. What Linux kernel does DVI2USB 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.

8. Can DVI2USB save captured VGA (still) signals as a movies?

Yes, DVI2USB can save captured still signals as AVI files.

9. Which AVI codec works best with DVI2USB?

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.

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

DVI2USB has an automatic algorithm that crops visible image from the VGA 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.

11. Does DVI2USB capture VGA and DVI signals simultaneously?

12. Can I connect two or more DVI2USBs to one computer and capture signals simultaneously? What is the resulting rate of capture for each DVI2USB?

Yes, you can connect two or more DVI2USB devices and capture multiple signals simultaneously. You will need to run the DVI2USB application for each DVI2USB device attached. However, you will notice a significant difference in the frame rate for each additional active DVI2USB. The higher the performance of your computer, the better the possible frame rate. Our internal testing on a Dell Dimension 2400 (Celeron 2.4GHz processor, 512mb RAM) at 1024x768 with two DVI2USB, yielded average frame rates of 7.1 fps and 4 fps. In contrast, a Pentium 4, 3.0Ghz desktop with 512MB of RAM at 1024 x 768 yielded average frame rates of 9.52 fps and 5.85 fps. Please note that you must start the DVI2USB application after connecting each DVI2USB.