How to get a higher FPS without changing speed video through Adobe After Effects or Premiere Pro CC2014 letting the software create the missing images I have a video that has been recorded at 7 FPS. I noticed that in the Windows properties of the video file, it is tagged as 25 FPS, and I see that the recorder has inserted each second fake frames (copies of the 7 frames shot in beetween these 7 images) to reach 25 FPS in the recorded video file.  

I'd like to convert it to a real 30 FPS video, without changing its duration, letting the software create missing images or replacing fake static ones (with newly interpolated images) to have a smoother play, even if it's not as perfect as what I could obtain with a native 25 FPS record.  

For a quick try, I have tried to put 2 effects one after the other, one to accelerate the video at 300%, to make the fake images disapear, and another to reduce the speed at 33%, to force the soft to create interpolated images, all of this in a 25 FPS (for a try at 25) composition in AE, with no success.

Do you know how I can do this ? All tutorials I find on the Web talks about accelerating or reducing speed for slow motion, but for my own I want to keep the speed, just make the whole thing smoother.
I can't give you specific commands but since these are fairly short I'd extract the individual frames into a TIFF stack (or similar), then import them at the correct (7fps) frame rate into your editor. Then I would apply twixtor or an open-source equivalent to raise the frame rate. How well those work depends somewhat on the amount of motion. 7 fps to 30 fps is asking a lot.

You may find ffmpeg / avconv assistance in extracting only the frames that are actually different -- that is, removing the extra inserted duplicate frames.