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*编辑:我将在下面保留代码,但是我想您有编解码器问题吗?我安装了xvID编解码器(这是示例Megamind.avi的编码方式),并且该程序可以在运行megamind视频的一个或两个线程中正常运行。您能使megamind视频在单线程版本中运行吗?
如果有帮助,这是有关opencv视频编解码器的文章。这是我使用的xvid下载(k-lite不适用于我)。
您编写的代码基本上对我有用。对于您和其他想要尝试的人,@R_761_10673@下工作:
VIDeoCapture.read可能还会出现其他错误,这些错误使值得使用read_attempt方法,但我只能找到文档中提到的两个错误。对于那些,它只返回false,代码已经对其进行了测试。
import os
import threading
import cv2
my_opencv_path = "C:/opencv2.4.3"
vIDeo_path_1 = os.path.join(my_opencv_path, "samples", "cpp", "tutorial_code",
"HighGUI", "vIDeo-input-psnr-ssim", "vIDeo",
"Megamind.avi")
vIDeo_path_2 = os.path.join(my_opencv_path, "samples", "c", "tree.avi")
assert os.path.isfile(vIDeo_path_1)
assert os.path.isfile(vIDeo_path_2)
class myThread (threading.Thread):
maxRetrIEs = 20
def __init__(self, thread_ID, name, vIDeo_url, thread_lock):
threading.Thread.__init__(self)
self.thread_ID = thread_ID
self.name = name
self.vIDeo_url = vIDeo_url
self.thread_lock = thread_lock
def run(self):
print "StarTing " + self.name
window_name = self.name
cv2.nameDWindow(window_Name)
vIDeo = cv2.VIDeoCapture(self.vIDeo_url)
while True:
# self.thread_lock.acquire() # these dIDn't seem necessary
got_a_frame, image = vIDeo.read()
# self.thread_lock.release()
if not got_a_frame: # error on vIDeo @R_197_9016@e or last frame finished
break
cv2.imshow(window_name, imagE)
key = cv2.waitKey(50)
if key == 27:
break
cv2.destroyWindow(window_Name)
print self.name + " ExiTing"
def main():
thread_lock = threading.Lock()
thread1 = myThread(1, "Thread 1", vIDeo_path_1, thread_lock)
thread2 = myThread(2, "Thread 2", vIDeo_path_2, thread_lock)
thread1.start()
thread2.start()
print "ExiTing Main Thread"
if __name__ == '__main__':
main()
我正在尝试读取2个视频文件,并同时在单独的Windows中显示它们。这是我的代码:
import threading
import cv2
threadLock=threading.Lock()
class myThread (threading.Thread):
maxRetries=20
def __init__(self,threadID,name,video_url):
threading.Thread.__init__(self)
self.threadID = threadID
self.name = name
self.video_url=video_url
def attemptRead(self,cvVideo):
threadLock.acquire()
(isRead,cvImagE)=cvVideo.read()
threadLock.release()
if isRead==false:
count=1
while isRead==false and count<myThread.maxRetries:
threadLock.acquire()
(isRead,cvImagE)=cvVideo.read()
threadLock.release()
print self.name+' try no: ',count
count+=1
return (isRead,cvImagE)
def run(self):
print "StarTing " + self.name
windowName = self.name
cv2.namedWindow(windowName)
cvVideo = cv2.VideoCapture(self.video_url)
while True:
(isRead,cvImagE)=self.attemptRead(cvVideo)
if isRead==false:
break
cv2.imshow(windowName,cvImagE)
key=cv2.waitKey(50)
if key==27:
break
cv2.destroyWindow(windowName)
print self.name + "ExiTing"
def main():
thread1 = myThread(1,"Thread1",'C:/Traffic Pics/Videos/Panjim Capture.mp4')
thread2 = myThread(2,"Thread2",'C:/Traffic Pics/Videos/Miramar Capture.mp4')
thread1.start()
thread2.start()
print "ExiTing Main Thread"
if __name__ == '__main__':
main()
发生了什么事是, 只有 在 线程2 窗口 中显示 。尝试读取超出 @H_701_37@max_retries限制
(在我的情况下为10)的视频后, 线程1退出 。问题是,尽管我创建了单独的 cvVideo 对象,但似乎无法同时使用它们。可能是什么问题呢?
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