使用 OpenCV 保存视频
原文:https://www.geeksforgeeks.org/saving-a-video-using-opencv/
OpenCV 是一个开源的也是最受欢迎的计算机视觉库，包含多种计算机视觉算法。你可以使用 OpenCV 对图像和视频进行读取、显示、写入和许多其他操作。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，使用cv.VideoWriter()方法。
注:详见OpenCV 简介。
语法: cv。视频写入器(文件名、fourcc、fps、帧大小)
参数:
文件名:输入视频文件 fourcc: 用于压缩帧的编解码器的 4 字符代码 fps: 视频流的帧率 帧大小:帧的高度和宽度
示例:
# 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:
[https://media.geeksforgeeks.org/wp-content/cdn-uploads/20200227195610/opencv-video.mp4](https://media.geeksforgeeks.org/wp-content/cdn-uploads/20200227195610/opencv-video.mp4)版权属于：月萌API www.moonapi.com，转载请注明出处
