15 | October | 2018 | TheAILearner

Steps:

Open the Video file or camera using cv2.VideoCapture()

Read frame by frame

Save each frame using cv2.imwrite()

Release the VideoCapture and destroy all windows

Now, Let’s code

import cv2

# Opens the Video file
cap= cv2.VideoCapture('C:/New/Videos/Play.mp4')
i=0
while(cap.isOpened()):
    ret, frame = cap.read()
    if ret == False:
        break
    cv2.imwrite('kang'+str(i)+'.jpg',frame)
    i+=1

cap.release()
cv2.destroyAllWindows()

import cv2

# Opens the Video file

cap= cv2.VideoCapture('C:/New/Videos/Play.mp4')

i=0

while(cap.isOpened()):

ret, frame = cap.read()

if ret == False:

break

cv2.imwrite('kang'+str(i)+'.jpg',frame)

i+=1

cap.release()

cv2.destroyAllWindows()

If you don’t have any video, no need to worry. Open the camera instead of the file using cv2.VideoCapture(0) and start extracting frames.

Use: We can perform a number of operations on these frames like crop, flip, reverse etc. save them into a list and iterate over them to get cropped/flipped/reversed video. (See How you can make Video from images)

Hope you enjoy reading. If you have any doubt/suggestion please feel free to ask and I will do my best to help or improve myself. Good-bye until next time

In this blog, we will do a small project using OpenCV-Python where we will be creating video from image sequences. This project is entirely based on what we read in Chapter 1 and 2. Let’s start

Steps:

Fetch all the image file names using glob
Read all the images using cv2.imread()
Store all the images into a list
Create a VideoWriter object using cv2.VideoWriter()
Save the images to video file using cv2.VideoWriter().write()
Release the VideoWriter and destroy all windows.

Let’s see the code

import cv2
import numpy as np
import glob

img_array = []
for filename in glob.glob('C:/New folder/Images/*.jpg'):
    img = cv2.imread(filename)
    height, width, layers = img.shape
    size = (width,height)
    img_array.append(img)


out = cv2.VideoWriter('project.avi',cv2.VideoWriter_fourcc(*'DIVX'), 15, size)
 
for i in range(len(img_array)):
    out.write(img_array[i])
out.release()

import cv2

import numpy as np

import glob

img_array = []

for filename in glob.glob('C:/New folder/Images/*.jpg'):

img = cv2.imread(filename)

height, width, layers = img.shape

size = (width,height)

img_array.append(img)

out = cv2.VideoWriter('project.avi',cv2.VideoWriter_fourcc(*'DIVX'), 15, size)

for i in range(len(img_array)):

out.write(img_array[i])

out.release()

glob.glob(Pathname) fetches all the filenames present in that path. ‘*.jpg’ means all the jpg files. So, in code glob.glob() fetches the filename of all the jpg files present in that path.

Hope you enjoy reading.

If you have any doubt/suggestion please feel free to ask and I will do my best to help or improve myself. Good-bye until next time.

TheAILearner

Mastering Artificial Intelligence

Daily Archives: 15 Oct 2018

Extracting and Saving Video Frames using OpenCV-Python

Steps:

Creating Video from Images using OpenCV-Python

Steps: