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I want to take an input of a video file (or image sequence) and then duplicate each frame. So if I had 3 frames, normally they'd go 1,2,3. After duplicating, I'd have 1,1,2,2,3,3 for a total of 6 frames. Is this possible with the compositor or one of the video editors in Blender, or do I have to go outside Blender?

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2 Answers 2

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This can be done in the VSE with the speed control effect:

  1. Select the video strip you want to slow down
  2. Add a speed effect strip (⇧ ShiftA> Effect Strip > Speed Control)
  3. Extend the original strip to twice its length

enter image description here

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  • $\begingroup$ For the reverse effect just use the Strobe setting in the Filter Properties of a strip. $\endgroup$
    – Samoth
    Nov 23, 2015 at 9:40
  • $\begingroup$ Okay, I'm trying this and it doesn't seem to be doing anything. I've got double the frames, but when I render the video clip out, it's not any different from the base clip. And in blender if I arrow key through the frames 1 by 1, it's still a new frame each time. It's not duplicating the frames. $\endgroup$
    – Ascalon
    Nov 26, 2015 at 4:57
  • $\begingroup$ @Drudge Huh. What happens if you set the speed multiplier to .5 on the speed strip? $\endgroup$
    – gandalf3
    Nov 26, 2015 at 7:58
  • $\begingroup$ @gandalf3 That seems to have worked, but I'm still not sure. I need to try it on more base footage. $\endgroup$
    – Ascalon
    Nov 27, 2015 at 22:30
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In the new versions of blender (2.9, 3.0, etc.) you can do it in Video Editing layout without any modifiers, simply by changing the Strobe parameter in the strip's options:

enter image description here

Maybe my answer will help someone. Hope so :)

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  • $\begingroup$ Not a problem to answer old questions :) $\endgroup$ Jan 26, 2022 at 18:36
  • $\begingroup$ I was trying to do this a couple of weeks ago and gave up because I couldn't make it work. I'll have to go back to that project and try this. $\endgroup$
    – Ron Jensen
    Jan 26, 2022 at 20:51

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