Remove duplicate frames

[Selur]

No clue why this is a PM, but...
one of these options can be used:

• Vapoursynth: 'Filtering->Vapoursynth->Other->Select Every'
  
• Avisynth: 'Filtering->Avisynth->Other->Select Every'
  
• In case neither Avisynth nor Vapoursynth is used 'Filtering->Speed Change->Scale output frame rate'
  

the tool-tip of each of the options should explain how to use the option for your goal.
In case the frame rate isn't simple created by doubling using Vapoursynths or Avisynth 'Restore'-filter is probably a better choice.

Cu Selur