How to combine 2 avi's one above one below into a single file

[werx]

I have 2 timelapse videos of the same period of time, and I wish to combine them into a single file so that one video is shown at the top and one at the bottom. Does anyone know how I can do this?

[manono]

Hi-

Yes, it's simple using AviSynth:

A=AVISource("C:\Path\To\Video1.avi")
B=AVISource("C:\Path\To\Video2.avi")
StackVertical(A,B)

http://avisynth.org/mediawiki/StackVertical

[werx]

Thank you so much I knew it must be possible with avisynth but i couldn't find out how (i'm clearly not good at searching documentation) That's great