How can I add a white background to a video in python?

Question

I'm looking for a way to resize videos by adding a white background instead of changing its proportions.

(A video with proportions 250x300px would transform to 300x300px by adding white band on each side of the video)

I've tried implementing the code I found on this thread to no result using ffmpeg, I'm very noob with image/video processing: Thread

def Reformat_Image(ImageFilePath):

from PIL import Image
image = Image.open(ImageFilePath, 'r')
image_size = image.size
width = image_size[0]
height = image_size[1]

if(width != height):
    bigside = width if width > height else height

    background = Image.new('RGBA', (bigside, bigside), (255, 255, 255, 255))
    offset = (int(round(((bigside - width) / 2), 0)), int(round(((bigside - height) / 2),0)))

    background.paste(image, offset)
    background.save('out.png')
    print("Image has been resized !")

else:
    print("Image is already a square, it has not been resized !")

Essentially I would love to be able to do what is done in that thread, but with videos.

Any help is extremely appreciated

Rotem · Accepted Answer · 2020-01-12T17:48:38.710

You can use ffmpeg-python with pad video filter:

import ffmpeg

input = ffmpeg.input('in.avi')
output = ffmpeg.output(input, 'out.mp4', vcodec='libx264', vf='pad=w=iw+50:h=ih:x=25:y=0:color=white')

output.run()

Testing:

Create in.avi for testing using FFmpeg in command line:

ffmpeg -y -r 10 -f lavfi -i mandelbrot=rate=10:size=250x300 -t 5 -c:v rawvideo -pix_fmt bgr24 in.avi

Python execution result (last frame of out.mp4):

Remarks:

The example builds in.avi as raw video format (without compression).
The example encodes out.mp4 with x264 codec (x264 / H.264 with default encoding parameters of FFmpeg).

How can I add a white background to a video in python?

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