According to
http://forums.animesuki.com/showthread.php?t=48608, there is an AviSynth plugin called avss.dll created by Haali (which can be obtained from the Haali Media Splitter).
Quote:
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DSS2 is Haali's implementation of Directshowsource. It has the advantage of being frame-accurate, but only supports VFR by converting it to CFR; at least that was the case when I tried it last time, it might have changed.
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The point being is whether it is based on DSS, since DSS2 is closed source. I will ask him about it.