Video Editing

Below an example:

• opening a video file

• process the frames one-by-one

• write a video file using the processed frames

import cv2

videopath_in = "video_in.mp4"
videopath_out = "video_out.mp4"

# Input video
cap = cv2.VideoCapture(videopath_in)

# Input video parameters
FPS = cap.get(cv2.CAP_PROP_FPS)
WIDTH = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
HEIGHT = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))

# Output video
writer = cv2.VideoWriter(videopath_out, cv2.VideoWriter_fourcc(*'mp4v'), FPS, (WIDTH, HEIGHT))

no_frame = 0
while(cap.isOpened()):
    # Get input frame
    ret, frame = cap.read()
    # frame shape: (height, width, channels = 3)
    # frame dtype: uint8
    # frame channels: BGR

    if ret == False:
        break

    # Do whatever you want with the frame here
    frame[200:600, : , :] = (255, 0, 0)

    # Write the frame to the output file
    writer.write(frame)

    # Progression
    print("\rNo frame = %d" % no_frame, end="")

writer.release()
cap.release()
cv2.destroyAllWindows()