Question

我查看了OpenCV Python example有关如何使用VideoCapture和VideoWriter来捕获和写出视频文件的信息。但我一直在说：

OpenCV Error: Assertion failed (dst.data == dst0.data) in cvCvtColor, file 
/tmp/opencv-n8PM/opencv-2.4.7.1/modules/imgproc/src/color.cpp, line 4422
Traceback (most recent call last):
  File "examples/observer/observer.py", line 17, in <module>
    video_writer.write(frame)
cv2.error: /tmp/opencv-n8PM/opencv-2.4.7.1/modules/imgproc/src/color.cpp:4422: error: 
(-215) dst.data == dst0.data in function cvCvtColor

清理相机。

以下是代码：

#!/usr/bin/env python import cv2


if __name__ == "__main__":
    # find the webcam
    capture = cv2.VideoCapture(0)

    # video recorder
    fourcc = cv2.cv.CV_FOURCC(*'XVID')  # cv2.VideoWriter_fourcc() does not exist
    video_writer = cv2.VideoWriter("output.avi", fourcc, 20, (680, 480))

    # record video
    while (capture.isOpened()):
        ret, frame = capture.read()
        if ret:
            video_writer.write(frame)
            cv2.imshow('Video Stream', frame)

        else:
            break

    capture.release()
    video_writer.release()
    cv2.destroyAllWindows()

Answer 1

帧的大小可能不正确：

w=int(capture.get(cv2.cv.CV_CAP_PROP_FRAME_WIDTH ))
h=int(capture.get(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT ))
# video recorder
fourcc = cv2.cv.CV_FOURCC(*'XVID')  # cv2.VideoWriter_fourcc() does not exist
video_writer = cv2.VideoWriter("output.avi", fourcc, 25, (w, h))

为我工作

Answer 2

在C ++中，如果你可以为编解码器传递-1。然后，您可以从计算机上的所有编解码器手动选择编解码器。在python中可能是相同的，但我在文档中找不到它。

video_writer = cv2.VideoWriter("output.avi", -1, 20, (680, 480))

尝试确保opencv可以在您的计算机上找到XVID。

Answer 3

我遇到了类似的问题。如果问题是框架大小和颜色，你应该调试＆＃39;深度或在你的编解码器。尝试将空数组写入文件：

capSize = (100, 100) # this is the size of my source video
fourcc = cv2.cv.CV_FOURCC('m', 'p', '4', 'v')
out = cv2.VideoWriter('output.mov',fourcc, 1, capSize)
...
out.write(125 * np.ones((100,100,3), np.uint8)) 
...

如何使用OpenCV和Python录制视频？

3 个答案: