You can do dozens, nay, scores of things with your videos, without ever having to open a graphical video-editing application. The same goes, believe or not, for video editing. That would work if you only had one file, but what would you do if you had a filesystem with hundreds of files scattered all over the place? You would never consider seriously trawling through every directory and subdirectory, opening each file in turn, and clicking through the search-and-replace process, would you? A Bash script using find and sed would be the way to go. Say you have to change every instance of "Bill" in a 100-page text file to "Gary." Sure, you could use the search-and-replace feature in your text editor. How much better? Well, it makes stuff easier to batch process, for starters. I'm not sure how to draw the box and scale it separately from the source video.Below is the video associated with this article. Now, if I set the width to a fixed value, it runs, but then there's the problem that the overlay contains the whole video itself as it is the input of the drawbox filter. With this I get an error of: Error when evaluating the expression 'if(gte(t*20,600),600,t*20)'. I've seen some solutions using overlay, but they are fixed width and are rather used to move the box around.
Since drawbox does not support the 't' (as in time) variable, I'm at a loss here. I need to draw a box that grows in size horizontally over a video (scaling its width as time goes by)
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