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A Practical Approach To Live Streaming

How to ensure a successful live streaming event.

  • Using Windows Server 2003, you must make sure that audio services are enabled. To do this, go to Start, Control Panel, and Sounds and Audio Devices. If audio services are DISABLED (the default), this window will contain only a single check box that says “enable.” Check this box, and press “OK,” and you'll be prompted to reboot. If the service is already enabled, you'll see the usual tabbed Sound and Audio Devices window.
  • If you're connecting with Microsoft Remote Desktop, you must apply the following settings: When starting Windows Remote Desktop, you have an “Options” button. Under Remote Desktop connection Options, Local Resources Tab, Remote Desktop has a setting for “Remote Computer Sound.” The default is “Bring to this Computer.” Change this setting to “Leave at Remote Computer.”

    • How can I create custom software applications with audio/video capture cards?

    Custom application development on many cards is done using the Microsoft DirectShow SDK. DirectShow is a sub-set of DirectX, and is primarily designed for the C/C++ programming language. Specific details and specs about DirectShow can be obtained from the Microsoft DirectX website, the Microsoft Developer Network site and from the DirectX/DirectShow documentation. Your card supplier should provide developer documentation about specific interfaces and functionality, as well as sample applications with source code in C++.

    I'm trying to capture from my audio/video capture card using Premiere Pro, but I can't select the device. Why? For Adobe Premiere Pro (versions 7x) a special Premiere plug-in is required. This also requires card-specific WDM-based drivers for Windows XP or Windows 2003. This type of driver is NOT available for Windows 2000.

    My video preview goes black during capture, but the encoded stream is fine. When capture is stopped, the preview comes back. Why? This is normal behavior by design in accordance with Microsoft's recommendations, and not really a problem or bug with the card or the driver. The driver is somewhat restricted in the combinations of capture and preview video that it can produce at the same time. If the capture pin or preview pin alone are used, the driver can produce video in any size and rate.

    Mark Hershey is vice president of engineering, ViewCast Corp., Plano, TX. He has served in various roles, including customer service, product management, marketing, and engineering management at Collins Radio/Rockwell, VMX, and Intecom. He can be reached at markh@viewcast.com.



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