使用 OpenCV 保存视频

OpenCV 是一个开源且最受欢迎的计算机视觉库，其中包含多种计算机视觉算法。您可以使用 OpenCV 对图像和视频进行读取、显示、写入和执行许多其他操作。 OpenCV 模块通常用于流行的编程语言，如 C++、 Python、 Java。要在 OpenCV 中保存视频，请使用cv.VideoWriter()方法。

注意：有关详细信息，请参阅 OpenCV 简介。

Syntax: cv.VideoWriter(filename, fourcc, fps, frameSize)

Parameters:

filename: Input video file
fourcc: 4-character code of codec used to compress the frames
fps: framerate of videostream
framesize: Height and width of frame

例子：

# Python program to save a 
# video using OpenCV
  
   
import cv2
  
   
# Create an object to read 
# from camera
video = cv2.VideoCapture(0)
   
# We need to check if camera
# is opened previously or not
if (video.isOpened() == False): 
    print("Error reading video file")
  
# We need to set resolutions.
# so, convert them from float to integer.
frame_width = int(video.get(3))
frame_height = int(video.get(4))
   
size = (frame_width, frame_height)
   
# Below VideoWriter object will create
# a frame of above defined The output 
# is stored in 'filename.avi' file.
result = cv2.VideoWriter('filename.avi', 
                         cv2.VideoWriter_fourcc(*'MJPG'),
                         10, size)
    
while(True):
    ret, frame = video.read()
  
    if ret == True: 
  
        # Write the frame into the
        # file 'filename.avi'
        result.write(frame)
  
        # Display the frame
        # saved in the file
        cv2.imshow('Frame', frame)
  
        # Press S on keyboard 
        # to stop the process
        if cv2.waitKey(1) & 0xFF == ord('s'):
            break
  
    # Break the loop
    else:
        break
  
# When everything done, release 
# the video capture and video 
# write objects
video.release()
result.release()
    
# Closes all the frames
cv2.destroyAllWindows()
   
print("The video was successfully saved")

输出：