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Learning VirtualDub: The Complete Guide to Capturing, Processing and Encoding Digital Video by Georgios Diamantopoulos, Sohail Salehi

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About AviSynth

The documentation included with AviSynth provides this answer to "What is AviSynth?"

AviSynth (AVI SYNTHesizer) is a frame server. This means that it serves up video, frame by frame, to another video application. The core of AviSynth’s power is scripting. Scripts are simple text files that contain a set of commands referencing one or more videos, and the effects you want to run on them.

When you open these script files in VirtualDub or another video application, AviSynth takes action. AviSynth performs the commands in the script, and sends the resulting video—frame by frame—to the video application. The video application has no idea what AviSynth is doing. As far as the application is concerned, it’s opened a standard AVI file with ...

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