无法关闭/开启CameraCapture使用Python / opencv：设备或资源繁忙 [英] Cannot turn off/on CameraCapture using Python/opencv: Device or resource busy

问题描述

当我尝试使用Python重新打开opencv的CameraCapture时，我得到：

  libv4l2：错误设置pixformat：设备或资源繁忙
 HIGHGUI错误：libv4l无法ioctl S_FMT 
 
 libv4l2：错误设置pixformat：设备或资源繁忙
 libv4l1：错误设置pixformat：设备或资源繁忙
 HIGHGUI错误：libv4l无法ioctl VIDIOCSPICT 
  

虽然我的应用程序使用PyQt和其他模块，我能够孤立的问题。所以当我点击r（重新加载）捕获对象被删除，但我不能重新打开一个连接到相机，因为它仍然活动：

 ＃！/ usr / bin / env python 
 
从opencv.cv import * 
从opencv.highgui import * 
 
 import sys 
 import time 
 import gc 
 
 cvNamedWindow（w1，CV_WINDOW_AUTOSIZE）
 camera_index = 1 
 capture = cvCreateCameraCapture（camera_index）
 
 def repeat（）：
全局捕获#declare为全局变量，因为我们现在分配给它们
全局camera_index 
 frame = cvQueryFrame（capture）
 cvShowImage w1，frame）
c = cvWaitKey（10）
 
如果c ==q：
 sys.exit（0）
 
 c ==r：
 
 print'reload'
 
 #del frame 
 del capture 
 
＃相当无用的睡眠，垃圾收集等。
＃gc.collect（）
 #import pdb; pdb.set_trace（）
 #print gc.get_objects（）
 #print gc.DEBUG_UNCOLLECTABLE 
＃time.sleep（2）
 
 capture = cvCreateCameraCapture（camera_index） 
 
 if __name__ ==__main__：
 while True：
 repeat（）
  

类似问题的提示对我无效：
在使用python时，在opencv中找不到ReleaseCapture？和/或 OpenCV / Array应该是CvMat或IplImage /释放捕获对象

解决方案

问题是你不是使用OpenCV API释放捕获组件。

你不应该使用 del捕获。正确的方法是通过：

  cvReleaseCapture（capture）
  pre> 
When I try to re-open opencv's CameraCapture using Python I get:
libv4l2: error setting pixformat: Device or resource busy
HIGHGUI ERROR: libv4l unable to ioctl S_FMT

libv4l2: error setting pixformat: Device or resource busy
libv4l1: error setting pixformat: Device or resource busy
HIGHGUI ERROR: libv4l unable to ioctl VIDIOCSPICT
Although my application runs in a bigger context using PyQt and various other modules, I was able to isolate the problem. So when I hit "r" (reload) the capture object is deleted but I'm not able to re-open a connection to the camera since it is still active:
#!/usr/bin/env python

from opencv.cv import *  
from opencv.highgui import *  

import sys
import time
import gc

cvNamedWindow("w1", CV_WINDOW_AUTOSIZE)
camera_index = 1
capture = cvCreateCameraCapture(camera_index)

def repeat():
    global capture #declare as globals since we are assigning to them now
    global camera_index
    frame = cvQueryFrame(capture)
    cvShowImage("w1", frame)
    c = cvWaitKey(10)

    if c == "q":
        sys.exit(0)

    if c == "r":

        print 'reload'

        #del frame
        del capture

        # pretty useless sleeping, garbage collecting, etc.
        #gc.collect()
        #import pdb; pdb.set_trace()
        #print gc.get_objects()
        #print gc.DEBUG_UNCOLLECTABLE
        #time.sleep(2)

        capture = cvCreateCameraCapture(camera_index)

if __name__ == "__main__":
    while True:
        repeat()
The hints given for similar questions did not work for me: 
cant find ReleaseCapture in opencv while using python? and/or OpenCV / Array should be CvMat or IplImage / Releasing a capture object
解决方案
The problem is that you are not releasing the capture component using the OpenCV API.

You shouldn't do del capture. The right way to do it is through:
cvReleaseCapture(capture)


                        
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