saving an image sequence from video using opencv2

Question

Newbie question and yes I have spent a lot of time sifting through similar questions and Answers with no luck.

What I am trying to do is save frames from a video fil

Answer 1

This is my code... I tryed a lot and finally made it this is c++ using opencv 3... hope it works

#include "opencv2/opencv.hpp"
#include <sstream>
#include <iostream>


using namespace cv;
using namespace std;

 Mat frame,img;
    int counter;

int main(int,char**)
   {
        VideoCapture vid("video3.avi");


while (!vid.isOpened())
{
    VideoCapture vid("video2.MOV");
    cout << "charging" << endl;
    waitKey(1000);

}

cout << "Video opened!" << endl;

while(1)
{
    stringstream file;

    vid.read(frame);
    if(frame.empty()) break;
    file << "/home/pedro/workspace/videoFrame/Debug/frames/image" << counter << ".jpg";
    counter++;
    imwrite(file.str(),frame);

    char key = waitKey(10);
 if ( key == 27)
 {break;}


}


} 

Answer 2

Use an index that will keep track of the number part in the filename. In the image capturing loop, add the index with the filename and build the final filename.

here is an example :

while(1)
{
     cap.read ( frame);
     if( frame.empty()) break;
     imshow("video", frame);
     char filename[80];
     sprintf(filename,"C:/Users/cssc/Desktop/testFolder/test_%d.png",i);
     imwrite(filename, frame);
     i++;
     char key = waitKey(10);
     if ( key == 27) break;
}

Answer 3

This is my way to do in Python3.0. Have to have CV2 3+ version for it to work. This function saves images with frequency given.

import cv2
import os
print(cv2.__version__)

# Function to extract frames 
def FrameCapture(path,frame_freq): 

    # Path to video file 
    video = cv2.VideoCapture(path) 
    success, image = video.read()

    # Number of frames in video
    fps = int(video.get(cv2.CAP_PROP_FPS))
    length = int(video.get(cv2.CAP_PROP_FRAME_COUNT))

    print('FPS:', fps)
    print('Extracting every {} frames'.format(frame_freq))
    print('Total Frames:', length)
    print('Number of Frames Saved:', (length // frame_freq) + 1)

    # Directory for saved frames
    try:
        frame_dir = path.split('.')[0]
        os.mkdir(frame_dir)
    except FileExistsError:
        print('Directory ({}) already exists'.format(frame_dir))

    # Used as counter variable 
    count = 0

    # checks whether frames were extracted 
    success = 1

    # vidObj object calls read 
    # function extract frames 

    while count < length :
        video.set(cv2.CAP_PROP_POS_FRAMES , count)
        success, image = video.read()
        # Saves the frames with frame-count 
        cv2.imwrite(frame_dir + "/frame%d.jpg" % count, image)
        count = count + frame_freq