@VS_Fan: As documented: "LSMASH...Source" functions support only containers compatible to the
ISO base media file format (MOV, MP4, 3GPP and similar), but not AVI.
@HolyWu: Thank you for the new Win64 build. A pity I can't use it when I need to use legacy AviSynth 2.5 filters which are available for Win32 only.