如何在 Python OpenCV 中保存视频 [英] How to save a video in Python OpenCV

问题描述

我使用 CV2 打开了一个视频，使用 cv2.rectangle 做了一些更改.

现在，当我执行 cv2.imshow('frame',frame) 时，它会播放视频.

我想将视频以原始大小和帧速率保存在某处，而不是这样.

解决方案

您可以逐帧保存视频.基于文档示例:

打开简历视频捕捉

<预><代码>将 numpy 导入为 np导入 cv2帽 = cv2.VideoCapture(0)# 定义编解码器并创建 VideoWriter 对象Fourcc = cv2.VideoWriter_fourcc(*'XVID')out = cv2.VideoWriter('output.avi',fourcc, 20.0, (640,480))而(cap.isOpened()):ret, frame = cap.read()如果 ret==True:框架 = cv2.flip(frame,0)# 写入翻转的帧写出(帧)cv2.imshow('frame',frame)如果 cv2.waitKey(1) &0xFF == ord('q'):休息别的:休息# 如果作业完成，则释放所有内容cap.release()out.release()cv2.destroyAllWindows()

I have opened a Video using CV2, made some changes using cv2.rectangle.

Now, when I do cv2.imshow('frame',frame), it plays the video.

Instead of this, I want to save the video somewhere, in the original size and frame rate.

解决方案

You can save video frame by frame. Based on example on docs:

Open Cv video capture

import numpy as np
import cv2

cap = cv2.VideoCapture(0)

# Define the codec and create VideoWriter object
fourcc = cv2.VideoWriter_fourcc(*'XVID')
out = cv2.VideoWriter('output.avi',fourcc, 20.0, (640,480))

while(cap.isOpened()):
    ret, frame = cap.read()
    if ret==True:
        frame = cv2.flip(frame,0)

        # write the flipped frame
        out.write(frame)

        cv2.imshow('frame',frame)
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break
    else:
        break

# Release everything if job is finished
cap.release()
out.release()
cv2.destroyAllWindows()

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