Isn't sing VFRtoCFR pretty much the same as converting to a constant frame rate with ffms2 or LSmash. ie
LWLibavVideoSource("some.mkv", FPSNum=30000, FPSDen=1001)
Or
FFVideoSource("some.mkv", FPSNum=30000, FPSDen=1001)
They both add or drop frames as required to produce a constant frame rate, as VFRtoCFR does, so I'm not sure how the frame numbers wouldn't change, whichever way you do it.
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