pip install opencv-python


import cv2
import numpy as np

def create_vertical_video(input_path, output_path):
    video_capture = cv2.VideoCapture(input_path)
    fps = int(video_capture.get(cv2.CAP_PROP_FPS))
    frame_width = int(video_capture.get(cv2.CAP_PROP_FRAME_WIDTH))
    frame_height = int(video_capture.get(cv2.CAP_PROP_FRAME_HEIGHT))
    total_frames = int(video_capture.get(cv2.CAP_PROP_FRAME_COUNT))

    output_height = frame_height * 2
    output_video = cv2.VideoWriter(output_path, cv2.VideoWriter_fourcc(*'mp4v'), fps, (frame_width, output_height))

    middle_x = frame_width // 2

    while True:
        ret, frame = video_capture.read()
        if not ret:
            break

        left_half = frame[:, :middle_x, :]
        right_half = frame[:, middle_x:, :]

        stacked_frame = np.vstack((left_half, right_half))
        output_video.write(stacked_frame)

    video_capture.release()
    output_video.release()

input_video_path = "input_video.mp4"
output_video_path = "vertical_video_output.mp4"
create_vertical_video(input_video_path, output_video_path)