Thanks Stephen, that explains it. I ended up using an override file so that only the affected frames are replaced with the nnedi'd ones.
Code:
cleaned=last.nnedi3(nsize=1)
TFM(slow=2,pp=2,ovr="override.txt",ovrDefault=1,clip2=cleaned)
TDecimate()
override.txt
Code:
field = top
0,7323 ----+
7414,55695 +----
55785,74347 ----+
74348,108943 +----
109013,112190 +----
112191,127123 ---+-
127214,151216 +----
151326,190168 --+--
190169,198208 ---+-