Read and Write Videos using OpenCV

Perform video processing to read, write and display the videos frame by frame using OpenCV

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A video is a collection of frames or images rolled out very fast on the screen. Frame rate or FPS(frames per second) is the rate at which consecutive images or frames are captured or displayed in a video. A Higher fps capture the movement better, and a slow frame rate can make the video look sluggish.

For example, If a video is captured and played back at 30fps, then 30 images will be rolled out every second.

In this article, you will learn to read a prerecorded video file along with capturing a video stream on a camera using OpenCV’s VideoCapture(), display the video frame per frame using imshow() and finally, write the video using VideoWriter()

The following steps are required to read the video

1. Create a video capture object to stream a video from the camera or read the video from a prerecorded video using VideoCapture().The VideoCapture() needs the device index or the video file's name as its input parameter.
2. Check if the video is getting streamed by checking if the camera/video is open using isOpened()
3. Read the video frame by frame using Opencv’s read()