30fps clip in a 60fps project; keep every frame at 2x speed

I would suggest to use Shotcut to convert your original image sequence:

If you want to use the 30fps h.264 file…

  1. Create a new project at 60fps
  2. Open the 30fps file (at this point, every frame will be displayed twice to make the conversion)
  3. Set the speed to 2x (at this point, every frame will be displayed once)
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