Python 3.x OpenCV从多个文件中提取第n帧

我试图从目录中的每个视频中捕获每200帧。我写了一个代码来解决这个问题，但问题是它从一个视频中提取所有帧，然后移动到下一个视频。但我试图从一个视频中提取帧，然后从下一个视频中提取相同的帧，以此类推，一旦从所有视频中提取第n帧，然后增加帧计数器，并开始以相同的顺序提取下一帧

我的代码片段如下所示：

for samples in path: # path is a list of all the video samples
  video = os.path.join(rootDir, samples)

  cap = cv2.VideoCapture(video)
  frameRate = 200 # frame rate
  currentframe=1

  while(cap.isOpened()):
    frameId = cap.get(1)
    ret, frame = cap.read() # reading from frame
    if (ret != True):
        break
    currentframe+=1
    if (currentframe % math.floor(frameRate) == 0):
      filename = './'+str(samples[:-4])+'/image'+str(int(currentframe))+".jpg"
      print('Creating...'+filename)
      cv2.imwrite(filename, frame)

# Release all the sape and windows once done
cap.release()

---

解决方案可以是这样的，创建一个名为cap的cap对象列表，并对其进行迭代

caps = []

for samples in path: # path is a list of all the video samples
  video = os.path.join(rootDir, samples)

  cap = cv2.VideoCapture(video)
  caps.append(cap)


frameRate = 200 # frame rate
currentframe=1

while(caps[0].isOpened()):

    frames = []

    for cap in caps:
        ret, frame = cap.read() # reading from frame
        frames.append(frame)

    if (ret != True):
        break
    currentframe+=1

    if (currentframe % math.floor(frameRate) == 0):
        for frame in frames:
            #filename = './'+str(samples[:-4])+'/image'+str(int(currentframe))+".jpg"
            #print('Creating...'+filename)
            #cv2.imwrite(filename, frame)

# Release all the sape and windows once done
for cap in caps:
    cap.release()

---

解决方案可以是这样的，创建一个名为cap的cap对象列表，并对其进行迭代

caps = []

for samples in path: # path is a list of all the video samples
  video = os.path.join(rootDir, samples)

  cap = cv2.VideoCapture(video)
  caps.append(cap)


frameRate = 200 # frame rate
currentframe=1

while(caps[0].isOpened()):

    frames = []

    for cap in caps:
        ret, frame = cap.read() # reading from frame
        frames.append(frame)

    if (ret != True):
        break
    currentframe+=1

    if (currentframe % math.floor(frameRate) == 0):
        for frame in frames:
            #filename = './'+str(samples[:-4])+'/image'+str(int(currentframe))+".jpg"
            #print('Creating...'+filename)
            #cv2.imwrite(filename, frame)

# Release all the sape and windows once done
for cap in caps:
    cap.release()

---

你有多少视频？为什么不创建n-cap对象并同时提取所有视频的帧？@roygbiv最多大约100-200个视频。您能告诉我如何创建n-cap对象并同时提取吗？（我不熟悉简历：D）谢谢！你有多少视频？为什么不创建n-cap对象并同时提取所有视频的帧？@roygbiv最多大约100-200个视频。您能告诉我如何创建n-cap对象并同时提取吗？（我不熟悉简历：D）谢谢！非常感谢，这是完美的。@x2212不客气，如果问题解决了，请选择此问题，否则它将保持打开状态。非常感谢，这是完美的。@x2212不客气，如果问题解决了，请选择此问题，否则它将保持打开状态