树莓派pi3启动时的视频录制自动化 [英] Automation of video recording on booting of raspberry pi3

问题描述

我写了一个python代码，其中包含一些与我的网络摄像头一起播放的opencv代码.我已将它附加到raspi3.我希望它在启动(启动)时自动开始录制视频. 我为此使用crontab.

I have written a python code which contains some opencv code to play around with my webcam. I have attached it to raspi 3. I want that on startup(booting), it start recording video automatically.. I am using crontab for this.

我的Python代码:

My Python code:

import cv

if __name__ == "__main__":
# find the webcam
capture = cv2.VideoCapture(0)
capture1 = capture
# video recorder
fourcc = cv2.cv.CV_FOURCC(*'XVID')  #cv2.VideoWriter_fourcc() does not exist
videoOut = cv2.VideoWriter('out1.avi', fourcc, 10.0, (640, 480))
videoOut1 = cv2.VideoWriter('out2.avi', fourcc, 10.0, (640, 480))
# record video
while (capture.isOpened() and capture1.isOpened()):
    ret, frame = capture.read()
    ret1, frame1 = capture1.read()
    if ret:
        videoOut.write(frame)
        cv2.imshow('Video Stream', frame)



    else:
        break
    if ret1:
        frame1 = cv2.flip(frame1,1)
        videoOut1.write(frame1)
        cv2.imshow('Video Stream1', frame1)

    else:
        break

    # Tiny Pause
    key = cv2.waitKey(1)

capture1.release()
videoOut1.release()
capture.release()
videoOut.release()
cv2.destroyAllWindows()

然后我制作了一个bash脚本，如下所示，

Then I made a bash script which looks like this,

cd /
cd absolute path to my python file directory
sudo python cam22.py
cd /

cam22.py是我的python文件的名称

cam22.py is the name of my python file

然后我使用contrab在运行时通过编写来运行此bash脚本

Then I used contrab to run this bash script at runtime by writing

@reboot path to my bash file

重新启动后，在同一目录中生成了两个avi文件，但未录制视频，网络摄像头无法运行，但是当我自己执行此bash文件以运行python文件时，该摄像头可以完美运行.

After rebooting two avi files are generated in the same directory but the video is not recorded, the webcam doesn't runs, which however runs perfectly when I myself execute this bash file to run the python file.

正如注释中所建议，我已经创建了一个日志文件，它显示错误日志(视频流:542):Gtk-警告**:无法打开显示:

As Suggested in comments, I've created a log file, it shows The error log shows (Video Stream:542): Gtk-Warning **: cannot open display:

推荐答案

正如Mark Setchell在评论中所建议的那样，在删除imshow()和waitkey()之后，它可以正常工作.

As suggested by Mark Setchell in the comments, it worked correctly after removing imshow(), waitkey().

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