VGA2USB Pro Frequently Asked Questions

VGA2USB Pro is a USB 2.0 video grabber designed for professionals who capture high resolution images and video from VGA streams at resolutions of up to 2048×2048 in a 24-bit color.

Will VGA2USB Pro work with USB 1.0 or USB 1.1?

VGA2USB Pro is compatible with USB 2.0 as well as USB 1.1. However, since VGA2USB transfers substantial amounts of data for each captured frame, performance will be greatly hampered with a USB 1.1 bus. USB 2.0 buses have a much higher transfer rate (480Mb/s), allowing VGA2USB 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 following 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 VGA2USB Pro capture?

It depends on the resolution of your screen, degree of movement on the source, the screen refresh rate, your operating system and the speed of the computer capturing the images. Results can be anywhere from 5 to 60 frames per second. Uncompressed frame transfer generally yields lower results than compressed frame transfer. Consult the Technical Specifications for capture rates based on resolution.

Does VGA2USB Pro reduce the resolution of the images it captures in order to transfer it over the USB bus?

No. VGA2USB Pro captures and transfers every pixel of the original VGA frame in RGB format. VGA2USB Pro uses lossless compression to transfer the image over the USB bus. In this respect, VGA2USB Pro provides better quality than a VGA-to-video converter paired with a Composite or S-Video grabber.

Can VGA2USB Pro 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 VGA2USB Pro. Can VGA2USB 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 VGA2USB Pro support? Is the driver's code open source?

Although we provide drivers for the 2.6.x series kernel (i386 and x86_64 platforms), we do not provide the source code for the driver itself. VGA2USB Pro driver supports Epiphan’s proprietary API (described in Linux SDK) as well as the Video4Linux API. Please contact us if you need a driver compiled for a specific kernel version or kernel setting.

Can VGA2USB Pro save captured signals as a movie?

Yes. VGA2USB Pro can save captured signals as an AVI file.

Which AVI codec works best with VGA2USB?

The choice of codec and codec settings depend on the requirements for the quality of the AVI. You may need to try several codecs with different settings to see which codec best fits your task.

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

VGA2USB Pro has an automatic algorithm that crops visible images from the VGA frame. The algorithm may make a mistake, however, and be off by a few pixels. Please use the procedure described below to correct cropping.Crop images

Can I connect two or more VGA2USB Pro devices to one computer and capture signals simultaneously? What is the resulting rate of capture for each VGA2USB?

Yes. You can connect two or more VGA2USB Pro devices and capture multiple signals simultaneously. You will need to run the VGA2USB Pro application for each VGA2USB Pro device attached. You will, however, notice a difference in frame rate for each additional active VGA2USB. The higher the performance of your computer, the better the possible frame rate. Note that you must start the VGA2USB Pro application after connecting each VGA2USB Pro.

With what software can I interpret the digital signal coming out of the USB port of the VGA2USB Pro device?

The VGA2USB Pro frame grabber works by emulating a high resolution video camera for Windows. VGA2USB is a DirectShow compatible device, which means that virtually any video capture software designed for Windows is compatible with VGA2USB. For example, VirtualDUB can be used to record AVI files, Microsoft Media Encoder to record WMV files, and RealProducer to record RM files.

Does the frame compression on VGA2USB Pro hamper the quality of the output?

No. VGA2USB Pro devices use a highly efficient and advanced compression algorithm that does not in any way reduce the image quality of the output. Through the use of this algorithm, high transfer rates can be achieved without any losses.

Is VGA2USB Pro software compatible with MAC OS?

Yes. VGA2USB Pro is fully compatible with Mac OS X 10.3.x and up. VGA2USB Pro devices also support the QuickTime API.