How and with what can I merge two video files of different resolutions in Python3?

Question

Python

Good afternoon. There is a script that determines the resolution of the video and creates the same resolution video from the picture, then everything is fastened together. The situation has changed and now you need to fasten ready-made video files, adjusting the resolution manually is very dreary, and attempts to combine videos of different resolutions give an unwatchable result at the output (everything is distorted and in noise). I know how to do it manually, but there are a lot of files and I would like to put everything on stream. Prompt modules, and it is better with an example how to solve this problem.

Answer 1

You can use the OpenCV library:

import cv2

video1 = cv2.VideoCapture('video1.mp4')
video1_width = video1.get(cv2.CAP_PROP_FRAME_WIDTH)
video1_height = video1.get(cv2.CAP_PROP_FRAME_HEIGHT)
video1_fps = video1.get(cv2.CAP_PROP_FPS)   

video2 = cv2.VideoCapture('video2.mp4')

writer = cv2.VideoWriter('video3.mp4', cv2.VideoWriter_fourcc(*'MP4V'), video1_fps, (video1_width, video1_height))
writer.set(cv2.VIDEOWRITER_PROP_QUALITY, 100)

while True:
    ret, frame = video2.read()
    if not ret:
        break
    frame = cv2.resize(frame, (video1_width, video1_height))
    writer.write(frame)

video1.release()
video2.release()
writer.release()

In the example, only frames from video2 are written, reduced to the resolution of video1. Recording video1 frames can be implemented by yourself.