Avisynth: how to draw a black rectangle over the certain range of a video?

[elektro]

For instance, draw 2 black rectangles (0,0,244,1080 & 1676,0,1920,1080) for a clip from 01:30 to 03:12.

[poisondeathray]

For instance, draw 2 black rectangles (0,0,244,1080 & 1676,0,1920,1080) for a clip from 01:30 to 03:12.

If those are x,y coordianates for top left, bottom right - they look like they correspond to 244 width, 1080 height , letterbox bars on a 1920x1080 frame - just crop and add borders

Use Trim and Aligned Spline to join the separate sections

Use the frame numbers that correspond to the time depending on your frame rate. You can use ShowTime() and or ShowFramenumber() in avisynth to preview the time and get the framenumber , or use an avs editor like avspmod that shows that info

Here is a demo script

ColorbarsHD(1920,1080,"YV24")
ConvertToYV12()
Trim(0,10000)
#ShowTime() #2698 - 5755 for 29.97FPS
orig=last

orig
crop(244,0,-244,0)
addborders(244,0,244,0)
bars=last

orig.Trim(0,2697)  ++ bars.Trim(2698,5755) ++ orig.Trim(5756,0)

Another method is to use overlay , you can use non rectangular shapes with an alpha mask - but your case is probably simpler with crop and addborders