How to append an image to a video using OpenCV or FFMPEG or Moviepy or other libraries?

Question

Do you know a library in Python to add a frame image to an existing video? The result video must have the same quality as the image.

I tried to use OpenCV to add google image: https://www.google.com/search?q=google&sxsrf=ALiCzsZhrdoHnOTmg0We4dxtguCqzma5Jg:1657603343101&source=lnms&tbm=isch&sa=X&ved=2ahUKEwiTh8bTzfL4AhWhplYBHfXNAKwQ_AUoAXoECAIQAw&biw=1492&bih=739&dpr=1.25#imgrc=PRtenhDnrVrfOM

But the quality decreases when the video elongates.

Here is the final result video : https://drive.google.com/file/d/1ArDvoX-kN9H_oLbACk3kU1Cid93SMczC/view?usp=sharing

Here is my code using OpenCV:

        image = cv2.imread(path_image)
        height, width, dimensions = image.shape
            
        video = cv2.VideoCapture(path_video)
        
        
        frames = []
        while(True):
            
            ret, frame = video.read()
            
            if ret == True: 
                frames.append(frame)
                # frame = frame.resize(frame, (width, height), fx=0, fy=0, interpolation = cv2.INTER_CUBIC)
                
                # Press S on keyboard 
                # to stop the process
                if cv2.waitKey(1) & 0xFF == ord('s'):
                    break
            # Break the loop
            else:
                break
            
        video2 = cv2.VideoWriter(path_video,cv2.VideoWriter_fourcc('M','J','P','G'), 30, (width, height))
        for frame in frames:
            video2.write(frame)
        video2.write(image)
        video2.release()  # releasing the video generated     
        print("Added {}".format(image_name))

I hope to improve the quality of this video.

Answer 1

I guess a simple way to achieve that using moviepy would be the following:

from moviepy.editor import *
from PIL import Image
import numpy as np

maxsize = (target_width, target_height)
jpg_image = Image.open(path_to_the_image)
# modify the image's resolution to be the target one
jpg_image.thumbnail(maxsize, Image.ANTIALIAS)
jpg_image = np.array(jpg_image)
image = ImageClip(jpg_image).set_duration(target_duration)

clip = VideoFileClip(path_to_the_video)
video = concatenate([image, clip], method="compose")
video.write_videofile("output_example.mp4", fps=target_fps)

As long as you set the target resolution of the image to match the video's one you are set with just that.