Another slipstream for build 248. The _FieldBased frame property is now doing this (instead of the older Avisynth semantics):
_FieldBased [int]
Describes the composition of the frame:
0=frame based (progressive), 1=interlaced bottom field first, 2=interlaced top field first.
Note that for DGSource() the GOP progressive flag is used to determine whether the
frame is progressive. If deinterlacing is enabled in DGSource() then _FieldBased is overridden
as progressive. If DGBob() or PVBob() are invoked, then _FieldBased is overridden
as progressive; if neither is invoked then _FieldBased is passed through from DGSource().
It requires Avisynth+ version 8 or greater. The changes for DGSource() are implemented for Vapoursynth also. DGBob() and PVBob() do not currently support Vapoursynth.
flyordie
https://rationalqm.us/dgdecnv/binaries