If you are adventurous, you could even use DDD in QTGMC, for example:
which is suggested on the vs_deepdeinterlace homepage. 
Cu Selur
# Imports
import vapoursynth as vs
# getting Vapoursynth core
import ctypes
import sys
import os
core = vs.core
# Import scripts folder
scriptPath = 'F:/Hybrid/64bit/vsscripts'
sys.path.insert(0, os.path.abspath(scriptPath))
# Loading Support Files
Dllref = ctypes.windll.LoadLibrary("F:/Hybrid/64bit/vsfilters/Support/libfftw3f-3.dll")
# loading plugins
core.std.LoadPlugin(path="F:/Hybrid/64bit/vsfilters/GrainFilter/RemoveGrain/RemoveGrainVS.dll")
core.std.LoadPlugin(path="F:/Hybrid/64bit/vsfilters/GrainFilter/AddGrain/AddGrain.dll")
core.std.LoadPlugin(path="F:/Hybrid/64bit/vsfilters/DenoiseFilter/DFTTest/DFTTest.dll")
core.std.LoadPlugin(path="F:/Hybrid/64bit/vsfilters/DenoiseFilter/NEO_FFT3DFilter/neo-fft3d.dll")
core.std.LoadPlugin(path="F:/Hybrid/64bit/vsfilters/Support/EEDI3m_opencl.dll")# vsQTGMC
core.std.LoadPlugin(path="F:/Hybrid/64bit/vsfilters/ResizeFilter/nnedi3/NNEDI3CL.dll")
core.std.LoadPlugin(path="F:/Hybrid/64bit/vsfilters/Support/libmvtools.dll")
core.std.LoadPlugin(path="F:/Hybrid/64bit/vsfilters/Support/scenechange.dll")
core.std.LoadPlugin(path="F:/Hybrid/64bit/vsfilters/Support/fmtconv.dll")
core.std.LoadPlugin(path="F:/Hybrid/64bit/vsfilters/MiscFilter/MiscFilters/MiscFilters.dll")
core.std.LoadPlugin(path="F:/Hybrid/64bit/vsfilters/DeinterlaceFilter/Bwdif/Bwdif.dll")
core.std.LoadPlugin(path="F:/Hybrid/64bit/vsfilters/SourceFilter/DGDecNV/DGDecodeNV.dll")
# Import scripts
import vs_deepdeinterlace
import havsfunc
import validate
# Source: 'G:\TestClips&Co\files\interlaceAndTelecineSamples\interlaced\bff.m2v'
# Current color space: YUV420P8, bit depth: 8, resolution: 720x480, frame rate: 29.97fps, scanorder: bottom field first, yuv luminance scale: limited, matrix: 470bg
# Loading G:\TestClips&Co\files\interlaceAndTelecineSamples\interlaced\bff.m2v using DGSource
clip = core.dgdecodenv.DGSource("J:/tmp/m2v_478bc6d007ec94bfc67367d30d9093a4_853323747.dgi",fieldop=0)# 29.97 fps, scanorder: bottom field first
frame = clip.get_frame(0)
# Setting detected color matrix (470bg).
clip = core.std.SetFrameProps(clip=clip, _Matrix=5)
# setting color transfer (170), if it is not set.
if validate.transferIsInvalid(clip):
clip = core.std.SetFrameProps(clip=clip, _Transfer=6)
# setting color primaries info (to 470), if it is not set.
if validate.primariesIsInvalid(clip):
clip = core.std.SetFrameProps(clip=clip, _Primaries=5)
# setting color range to TV (limited) range.
clip = core.std.SetFrameProps(clip=clip, _ColorRange=1)
# making sure frame rate is set to 29.97fps
clip = core.std.AssumeFPS(clip=clip, fpsnum=30000, fpsden=1001)
# making sure the detected scan type is set (detected: bottom field first)
clip = core.std.SetFrameProps(clip=clip, _FieldBased=1) # bff
# Deinterlacing using QTGMC
clipEdiExt = clip
# adjusting color space from YUV420P8 to RGBS for vsDDD
clipEdiExt = core.resize.Bicubic(clip=clipEdiExt, format=vs.RGBS, matrix_in_s="470bg", range_s="limited")
clipEdiExt = vs_deepdeinterlace.DDD(clip=clipEdiExt, tff=False, device="cuda")
# Making sure content is preceived as frame based
clipEdiExt = core.std.SetFrameProps(clip=clipEdiExt, _FieldBased=0) # progressive
clipEdiExt = core.resize.Bicubic(clip=clipEdiExt, format=vs.YUV420P8, matrix_s="470bg", range_s="limited", dither_type="error_diffusion")
clip = havsfunc.QTGMC(Input=clip, Preset="Slower", InputType=0, TFF=False, TR2=1, SourceMatch=0, Lossless=0, opencl=True, EdiExt=clipEdiExt) # new fps: 59.94
# Making sure content is preceived as frame based
clip = core.std.SetFrameProps(clip=clip, _FieldBased=0) # progressive
# adjusting output color from: YUV420P8 to YUV420P10 for NVEncModel
clip = core.resize.Bicubic(clip=clip, format=vs.YUV420P10, range_s="limited")
# set output frame rate to 59.94fps (progressive)
clip = core.std.AssumeFPS(clip=clip, fpsnum=60000, fpsden=1001)
# output
clip.set_output()Quote:If you would like to finetune or improve the results, consider using one of these deinterlacers as "EdiExt"-clip in QTGMC.see: https://github.com/pifroggi/vs_deepdeinterlace
Cu Selur