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  1. Does AviSynth have Smoother as in VirtualDub? Can you tell me what's the filter's name for it?
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  2. There are many noise reduction filters in AviSynth. Smoother in VirtualDub is a simple 2d noise reduction filter (2d means they work in individual frames without taking into account other frames). Probably closest to VirtualDub's Smoother is SpatialSoften().

    http://avisynth.nl/index.php/SpatialSoften

    There are many more sophisticated 2d noise reduction filters:

    http://avisynth.nl/index.php/External_filters#Spatial_Denoisers

    Better noise reducers are temporal and spacial (they work across multiple frames). Some are even motion compensated:

    http://avisynth.nl/index.php/External_filters#Temporal_Denoisers
    http://avisynth.nl/index.php/External_filters#Spatio-Temporal_Denoisers
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