[HELP] Feature film with duplicate frames

[Selur]

yes
"Filtering->Vapoursynth->Frame->Misc->FillDuplicateFrames" is probably the right choice if there are multiple duplicate frames in a row sometimes, otherwise FillDrops should work too. Replacing frames with interpolated frames should not change av sync.

If the duplicates follow a pattern, dropping them using SelectEvery while adjusting the frame rate would also keep the runtime and the sync.

Cu Selur