Replacing part of a frame

[Akai-Shuichi]

I have a set of 64 frames with a 200x200 box overtop of a black background and I want to replace that box with a 200x200 black box from another source or just draw a 200x200 black box over top of it, but am unsure of how to do this.

I was looking into the Overlay section, but can't really think of a way to make it not do the entire image...

[poisondeathray]

It can be done with a mask , or alpha channel (transparency)

Does the "box" move or is it static ?

What program(s) are you using ? A video editor /NLE ? or avisynth ?

[Akai-Shuichi]

AviSynth and the box is static the entire time.

[jagabo]

WhateverSource() # get source video
box = BlankClip(last).Crop(0,0,200,200) # create a black clip with same properties as source, crop to 200x200
Overlay(last, box, x=0, y=0) # overlay the the box at 0,0, or wherever you need it

[Akai-Shuichi]

That would work, but there is some text at the very bottom of the frame that I do not want to crop away.

[jagabo]

I think you need to show an example of the source and what you want.

[johnmeyer]

Jagabo gave you the code, but you still need to make some modifications yourself to make it work the way you want.

[jagabo]

I originally posted Crop(0,200,-0,-0).AddBorders(0,200,0,0) thinking that the video was 200 pixels wide. But after a while I thought maybe that wasn't the case and updated the post. And updated the post again with more comments. I don't know which he was responding to.

[Akai-Shuichi]

Ya, I was replying to his original reply before he edited it. The edited one worked like a charm though.

Thanks so much!