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an AVS is a 'file'. so it _always_ has to be opened by a program! AVISynth only operates on demand. That is the program with which you opened the AVS is requesting the next frame or audio.
If you opened an AVI, the codec decompresses the requested frame and gives it to the requesting program.
If you opened an AVS, AVISynth itself request a frame from the codec, processes it (through the functions and filters noted in the AVS) and then returns the processed frame to the requesting program.
bye, Malcolm
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