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I am using the following filter_complex to put 2 videos of resolution 320 x 240, one right next to the other:
-filter_complex "[v1][v2]hstack=inputs=2[videoout]"
This works great, but now I was wondering how could I do it, so that I could add a small padding between them. Let's say for instance 5 black pixels (even though I would love to be able to customize the color or at least the distance).
How could I do that?
First, setup a color filter of the same height, and then add it to the hstack
-filter_complex "color=black:5x240[c];[v1][c][v2]hstack=inputs=3:shortest=1[videoout]"
See the options for the color filter here.
Alternate method is
-filter_complex "[0]pad=iw+5:ih:color=black[0v];[0v][v2]hstack[videoout]"
There is a way to achieve this result that may be more relevant to your interests:
Problem: Resize videos centering them in the middle of a pre-determined rectangle, letterboxing if needed.
The key line from the answer:
ffmpeg -i input -vf "scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2" output
