How to make a quick test video in Avisynth

#This is how you make a video clip
#to test on with Avisynth

ColorBars() 

The ColorBars filter in Avisynth produces a video clip containing SMPTE color bars scaled to any image size. The clip produced is 640×480, RGB32 [16,235], 29.97 fps, 1 hour long. [Source]

So, what are SMPTE color bars? If you’ve done a lot of TV surfing in your day—particularly late at night—then you’ve probably encountered this set of color bars accompanied by a loud monotone. The “bars and tone” are more formally known as the Society of Motion Picture and Television Engineers (SMPTE)’s Engineering Guideline EG 1-1990, used to calibrate monitors.

What looks like random blocks of color to the untrained eye is actually a carefully laid-out test pattern. For example, the colors yellow, cyan, green, magenta, red, blue actually goes from most luminous to least, and that’s used to find the proper white level. And “blue only” mode, the middle strip of blue, black, magenta, and white rectangles look the same as the bars above them. This is used for color balance (below). There’s a lot more to geek out over if you’re so inclined. [Source]