Using Adobe Connect Pro and a Capture Card to Broadcast VGA

What makes software packages like Adobe Connect Pro, Cisco WebEx, and Microsoft Live Meeting useful is the ability to broadcast anything that is visible on the computer screen as long as you have one of these applications installed and running. However, there are situations where one cannot install a web collaboration/presentation software on a computer but still needs to broadcast the image from it. It is also possible that you are using a device or operating system that is incompatible with your favorite webcasting software. Perhaps you would like to broadcast from a document camera pod with a VGA or DVI interface.

 

 

Some situations where an external frame grabber is useful:

• When a network connection is lost, the presenters screen is still being recorded.
• There are not enough system resources to run Connect Pro, or the computer does not allow the installation of Adobe Connect Pro.
• Switching layouts- Once a layout has been switched, the computer sharing the screen in the previous layout needs to be activated again.
• Audio – When working with demos, the demo machine’s audio needs to have the Connect Pro audio installed, but muted (through the voice and camera pod) otherwise the session’s audio will echo.
• Bandwidth – Each demo computer needs to be logged into the Connect Pro meeting. When many computers/devices are connected to a Connect Pro meeting, too much bandwidth is “eaten up”.
• Unsupported devices – Since Adobe Connect Pro is normally only compatible with Windows and Mac OS X, adding a frame grabber allows you to use Connect Pro on any device with a VGA or DVI port.

source: www.connectusers.com

In order to accomplish this, you would need to use a frame grabber connected to a Connect Pro capture computer. You would then launch the application that comes with the grabber on the computer with the VGA grabber and share it with Connect Pro. As long as the VGA source is connected to the grabber itself, then you’re ready to broadcast the image from it!

 

What frame grabber works best with Adobe Connect Pro?

There is no universal answer to this question and it really depends on what your capturing needs are. If you are looking for something cost-effective and do not need to broadcast an image with as lot of movement, then the Epiphan Systems VGA2USB will be enough. However, if you need to broadcast an HD or other high-quality imagery, then we suggest to look into the NCast DCC3.1, Epiphan VGA2Ethernet, or DVI2USB Duo.

For a detailed comparison and description of the most advanced high-resolution frame grabbers on the market, please refer to our frame grabber comparison table.

DVI Image and Video Capture – The Basics

Almost all computer equipment sold these days supports DVI. This can range from modern computers and  projectors to game consoles like the Microsoft X-Box. Of course, this means that high end hardware solutions for DVI capture are now becoming readily available.

The first thing that you must determine is whether your DVI signal is a true digital video signal or a traditional analog source. The easiest way to tell if a digital or analog signal is running through your DVI port is to look at he connector that you are using and match it with the diagram of the DVI connector below.

If either your DVI plug or connector are DVI-D (DVI-Digital), this means that a 100% digital signal is being used. For this kind of signal, you absolutely need to use a DVI frame grabber.

If the connector or plug is of the DVI-A (DVI-Analog) flavor, then you’d be able to use a DVI to VGA adapter and a VGA frame grabber. DVI-A supports analog signals only is and is identical to VGA but with a different pin placement.

If the plug is DVI-I (DVI-Integrated), this means that it is capable of running both an analog and digital signal along the cable. Thus, unless you know if the signal is analog or digital, you would need a DVI-capable frame grabber to capture the signal.

 

As stated earlier, a VGA frame grabber would do the job for DVI-A and analog-only DVI-I signals.  Before a VGA grabber can be used, the DVI signal needs to be converted to a VGA one using a DVI-to-VGA adapter, which costs roughly $10 (pictured below).

You can now follow the same procedure as you would when recording a VGA signal with your VGA frame grabber.

 

Digital Signals (DVI-D and DVI-I)

If you have determined that you have a digital DVI signal that needs to be captured, a DVI-specific frame grabber must be used. Before choosing a suitable frame grabber, you must determine if the DVI signal is single link or dual link.

A single link DVI signal can support, at a refresh rate of 60 Hz, a maximum resolution of 1915 x 1436. If your DVI cable supports a higher resolution at a refresh rate of 60 Hz, then you are running a dual link signal. Dual link DVI is used primarily on large LCD monitors, such as the Apple monitor or the 25″+ Dell monitors.

If you need to capture a dual link DVI signal, then your choice of frame grabber is limited to one model, the Epiphan Systems DVI2USB Duo (pictured below), which captures single and dual link digital DVI signals only.

Unfortunately, the DVI2USB Duo is a very specific high-end frame grabber that does not have the ability to capture an analog or VGA video signal. However,  the DVI2USB Duo is a blessing for those with dual link DVI capture requirements. You can see how the DVI2USB Duo stacks up against its competition in this table.

If, however, you need to capture a single link DVI signal, then your choices are much greater. If you are looking for a PCI-based card, then you have a choice of the EMS Imaging Xtreme RGB, NCast DCC 3.1 or the Unigraf UFG-03. If you are into external USB-based solutions, then Epiphan Systems offers the DVI2USB, which is an external dual-mode VGA and DVI frame grabber or the DVI2USB Solo, which can capture a single link DVI signal only.

There is no one ideal frame grabber that does everything. Your choice of a DVI capturing device should depend on your needs, as outlined above. If you wish to find the specifications of each frame grabber featured in this article, then this would be a good place to start.