frame doubler

[*.mp4 guy]

I looked on Avisynth.org, but I wasn't able to find a way to double the amount of frames I have by duplicating them. What I need would work like this.

input:1234
output:11223344

[edit]

Misread a page, problem solved.

[scharfis_brain]

anyways even if you already solved the problem, there are several ways to accomplish that task:

1) selectevery(1,0,0)
2) changefps(last.framerate()*2)
3) interleave(last, last)