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Python | Play a video using OpenCV

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  • Difficulty Level : Medium
  • Last Updated : 15 Oct, 2018

OpenCV (Open Source Computer Vision) is a computer vision library that contains various functions to perform operations on Images or videos. OpenCV library can be used to perform multiple operations on videos.

Let’s see how to play a video using the OpenCV Python.

To capture a video, we need to create a VideoCapture object. VideoCapture have the device index or the name of a video file. Device index is just the number to specify which camera. If we pass 0 then it is for first camera, 1 for second camera so on. We capture the video frame by frame.
Syntax :

cv2.VideoCapture(0): Means first camera or webcam.
cv2.VideoCapture(1):  Means second camera or webcam.
cv2.VideoCapture("file name.mp4"): Means video file

Below is the implementation:

# importing libraries
import cv2
import numpy as np
# Create a VideoCapture object and read from input file
cap = cv2.VideoCapture('tree.mp4')
# Check if camera opened successfully
if (cap.isOpened()== False): 
  print("Error opening video  file")
# Read until video is completed
  # Capture frame-by-frame
  ret, frame =
  if ret == True:
    # Display the resulting frame
    cv2.imshow('Frame', frame)
    # Press Q on keyboard to  exit
    if cv2.waitKey(25) & 0xFF == ord('q'):
  # Break the loop
# When everything done, release 
# the video capture object
# Closes all the frames

Note : Video file should have in same directory where program is executed.

Sample Frame of video :

Related Article : How to play video in reverse mode.

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