Moviepy：用黑色边框调整图像大小

Question

I have a problem with resizing videos in moviepy. When I use the clip.resize(1920,1080) function, it stretches the image. I want it to stretch the image, keep the aspect ratio, but add black borders to it (to fill the aspect ratio).

This is the source image/video (resolution: 670 x 844)

This is how I want it to look (resolution: 1920 x 1080)

Answer 1

Mix it with some black image in resolution you whish:

video = mp.VideoFileClip("/media/pi/video.mp4")
black_image = (mp.ImageClip("black_picture_1920x1080.jpg"))
mp.CompositeVideoClip([black_image, video.set_position("center")])