Is there a program to control and play 2 videos at the same time?

[pakthedude]

Is there a program or a plugin for avisynth/virtualdub/tempenc to control and play 2 videos at the same time?
For comparison purposes.

I know i can use two different programs or programs that has the options to run the 2nd video on another window. But is there anything out there that has these ablities?

[smok3]

you can stack them with avisynth;a = DirectShowSource("video1.mp4" ,fps=25)
a = subtitle(a, "1")
b = DirectShowSource("video2.mp4" ,fps=25)
b = subtitle(b, "2")
video = StackVertical(a,b)
return video

[pakthedude]

Thanks, but there's a error on line 5 when i tried to play it.

[smok3]

pakthedude: what error? if color spaces does not match then you will have to convert one of the clips to the proper color space, also the resolutions, framerates, ect of the two clips must match.