Python和OpenCV - 无法编写可读的avi视频文件 [英] Python and OpenCV - Cannot write readable avi video files

问题描述

我有一个这样的代码：

import numpy as np
import cv2


cap = cv2.VideoCapture('C:/Users/Hilman/haatsu/drive_recorder/sample/3.mov')

# 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()

但是， code> output.avi 无法播放。

But the output.avi cannot be played.

尝试也可以更改 out = cv2.VideoWriter（'output.avi'，fourcc，20.0，（640,480））到这样的东西（由某些人建议） out = cv2.VideoWriter（'output.avi'，-1,20.0，（640,480））。但是当我这样做时，我收到了这个消息

Tried also change the out = cv2.VideoWriter('output.avi', fourcc, 20.0, (640,480)) to something like this (as suggested by some people) out = cv2.VideoWriter('output.avi', -1, 20.0, (640,480)). But when I did this, I got this message

OpenCV：没有找到FFMPEG：标签0xffffffff /''（格式'avi / AVI音频视频交错）'）'。

可能是什么问题？我正在使用Windows 10。

What could be the problem? I am using Windows 10 by the way.

推荐答案

我无法将该代码运行在我的Windows 10机器上。

I couldn't get that code to run on my Windows 10 machine either.

所以这就是我所做的：

1. 我遵循这些说明，并在机器上安装了最新的ffmpeg版本：
   
   

1. I followed these instructions and installed the latest ffmpeg build on machine:

1. 下载适用于Windows的最新静态版本然后解压缩文件。您可能需要7zip解压缩。


2. 在C：\中创建一个文件夹，名为 ffmpeg


3. 将提取的文件的内容复制到C：\ffmpeg


4. 编辑您的PATH环境变量，最后附加以下条目：
   C：\ffmpeg\bin;


5. 通过打开cmd提示符并输入以下内容，确认所有内容都正常运行（注意，您可能需要运行cmd作为管理员）：
   ffmpeg -version

1. Download the latest static build for Windows and then extract the files. You may need 7zip to extract.
2. Create a folder in C:\ called ffmpeg
3. Copy the contents of the extracted files into C:\ffmpeg
4. Edit your PATH environment variable to append at the end the following entry: C:\ffmpeg\bin;
5. Confirm that everything is working correct by opening a cmd prompt and enter the following (Note you might need to run cmd as administrator): ffmpeg -version

修改代码如下：

_

import numpy as np
import cv2
import os

base_path = 'C:\\Users\\Hilman\\haatsu\\drive_recorder\\sample\\'
cap = cv2.VideoCapture('%s3.mov' % base_path)

i = 0
while(cap.isOpened()):
    ret, frame = cap.read()
    if ret==True:
        frame = cv2.flip(frame,0)
        cv2.imwrite(os.path.join(base_path, str(i) + '.png'), frame)
        i = i + 1
    else:
        break

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

1. 在 C：\Users\Hilman\haatsu\drive_recorder\sample 并运行以下命令： ffmpeg -framerate 29 -i％d.png -c：v libx264 -r 30 -pix_fmt yuv420p out.mp4


2. 您的视频应该保存为 out.mp4 。

1. Opened a command prompt at C:\Users\Hilman\haatsu\drive_recorder\sample and ran the following command: ffmpeg -framerate 29 -i %d.png -c:v libx264 -r 30 -pix_fmt yuv420p out.mp4
2. Your video should be saved as out.mp4.

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