10_21.py

%%time
frames = os.listdir('frames/')
frames.sort(key=lambda f: int(re.sub('\D', '', f)))

frame_array=[]

for i in range(len(frames)):
    
    #reading each files
    img = cv2.imread('frames/'+frames[i])
    img = cv2.cvtColor(img,cv2.COLOR_BGR2RGB)

    height, width, layers = img.shape
    size = (width,height)
    
    #inserting the frames into an image array
    frame_array.append(img)

out = cv2.VideoWriter('sample_output.mp4',cv2.VideoWriter_fourcc(*'DIVX'), 25, size)
 
for i in range(len(frame_array)):
    # writing to a image array
    out.write(frame_array[i])
out.release()