我试图让以下工作正常但仍然收到NoneType错误。
# import the necessary packages
from __future__ import print_function
from imutils.video import VideoStream
import numpy as np
import argparse
import imutils
import time
import cv2
# construct the argument parse and parse the arguments
ap = argparse.ArgumentParser()
ap.add_argument("-o", "--output", required=True,
help="path to output video file")
ap.add_argument("-p", "--picamera", type=int, default=-1,
help="whether or not the Raspberry Pi camera should be used")
ap.add_argument("-f", "--fps", type=int, default=20,
help="FPS of output video")
ap.add_argument("-c", "--codec", type=str, default="MJPG",
help="codec of output video")
args = vars(ap.parse_args())
# initialize the video stream and allow the camera
# sensor to warmup
print("[INFO] warming up camera...")
vs = VideoStream(usePiCamera=args["picamera"] > 0).start()
time.sleep(2.0)
# initialize the FourCC, video writer, dimensions of the frame, and
# zeros array
fourcc = cv2.VideoWriter_fourcc(*args["codec"])
writer = None
(h, w) = (None, None)
zeros = None
# loop over frames from the video stream
while True:
# grab the frame from the video stream and resize it to have a
# maximum width of 300 pixels
frame = vs.read()
frame = imutils.resize(frame, width=300)
# check if the writer is None
if writer is None:
# store the image dimensions, initialzie the video writer,
# and construct the zeros array
(h, w) = frame.shape[:2]
writer = cv2.VideoWriter(args["output"], fourcc, args["fps"],
(w * 2, h * 2), True)
zeros = np.zeros((h, w), dtype="uint8")
# break the image into its RGB components, then construct the
# RGB representation of each frame individually
(B, G, R) = cv2.split(frame)
R = cv2.merge([zeros, zeros, R])
G = cv2.merge([zeros, G, zeros])
B = cv2.merge([B, zeros, zeros])
# construct the final output frame, storing the original frame
# at the top-left, the red channel in the top-right, the green
# channel in the bottom-right, and the blue channel in the
# bottom-left
output = np.zeros((h * 2, w * 2, 3), dtype="uint8")
output[0:h, 0:w] = frame
output[0:h, w:w * 2] = R
output[h:h * 2, w:w * 2] = G
output[h:h * 2, 0:w] = B
# write the output frame to file
writer.write(output)
# show the frames
cv2.imshow("Frame", frame)
cv2.imshow("Output", output)
key = cv2.waitKey(1) & 0xFF
# if the `q` key was pressed, break from the loop
if key == ord("q"):
sys.exit()
# do a bit of cleanup
print("[INFO] cleaning up...")
cv2.destroyAllWindows()
vs.stop()
writer.release()
构建信息：
UI:
QT: NO
GTK+ 2.x: YES (ver 2.24.25)
GThread : YES (ver 2.42.1)
GtkGlExt: NO
OpenGL support: NO
VTK support: NO
Media I/O:
ZLib: /usr/lib/arm-linux-gnueabihf/libz.so (ver 1.2.
JPEG: libjpeg (ver 90)
WEBP: build (ver 0.3.1)
PNG: /usr/lib/arm-linux-gnueabihf/libpng.so (ver 1.2.50)
TIFF: build (ver 42 - 4.0.2)
JPEG 2000: build (ver 1.900.1)
OpenEXR: build (ver 1.7.1)
GDAL: NO
GDCM: NO
Video I/O:
DC1394 1.x: NO
DC1394 2.x: NO
FFMPEG: YES
avcodec: YES (ver 56.1.0)
avformat: YES (ver 56.1.0)
avutil: YES (ver 54.3.0)
swscale: YES (ver 3.0.0)
avresample: YES (ver 2.1.0)
GStreamer: NO
OpenNI: NO
OpenNI PrimeSensor Modules: NO
OpenNI2: NO
PvAPI: NO
GigEVisionSDK: NO
Aravis SDK: NO
UniCap: NO
UniCap ucil: NO
V4L/V4L2: NO/YES
XIMEA: NO
Xine: NO
gPhoto2: NO
Parallel framework: pthreads
Other third-party libraries:
Use IPP: NO
Use VA: NO
Use Intel VA-API/OpenCL: NO
Use Lapack: NO
Use Eigen: NO
Use Cuda: NO
Use OpenCL: YES
Use OpenVX: NO
Use custom HAL: YES (carotene (ver 0.0.1))
OpenCL: <Dynamic loading of OpenCL library>
Include path: /home/pi/opencv-3.2.0/3rdparty/include/opencl/1.2
Use AMDFFT: NO
Use AMDBLAS: NO
Python 2:
Interpreter: /home/pi/.virtualenvs/cv/bin/python2.7 (ver 2.7.9)
Libraries: /usr/lib/arm-linux-gnueabihf/libpython2.7.so (ver 2.7.9)
numpy: /home/pi/.virtualenvs/cv/local/lib/python2.7/site-packages/numpy/core/include (ver 1.12.1)
packages path: lib/python2.7/site-packages
Python 3:
Interpreter: /usr/bin/python3.4 (ver 3.4.2)
Libraries: /usr/lib/arm-linux-gnueabihf/libpython3.4m.so (ver 3.4.2)
numpy: /usr/lib/python3/dist-packages/numpy/core/include (ver 1.8.2)
packages path: lib/python3.4/site-packages
Python (for build): /home/pi/.virtualenvs/cv/bin/python2.7
Java:
ant: NO
JNI: NO
Java wrappers: NO
Java tests: NO
Matlab: Matlab not found or implicitly disabled
Documentation:
Doxygen: NO
Tests and samples:
Tests: YES
Performance tests: YES
C/C++ Examples: YES
Install path: /usr/local
cvconfig.h is in: /home/pi/opencv-3.2.0/build
返回的错误是：
python writing_video.py --output example.avi
[INFO] warming up camera...
Traceback (most recent call last):
File "writing_video.py", line 38, in <module>
frame = imutils.resize(frame, width=300)
File "/home/pi/.virtualenvs/cv/local/lib/python2.7/site-packages/imutils/convenience.py", line 69, in resize
(h, w) = image.shape[:2]
AttributeError: 'NoneType' object has no attribute 'shape
^我已经进入了convenience.py，看看我是否能发现我正在制作的任何错误，但它似乎与我的代码对齐
我理解Nonetype错误意味着形状没有价值，因此无法调用它。我已经被困在这个错误上一个多星期了，现在看不到答案。我刚刚重新映像我的pi并为python2.7重新安装了opencv-3.2.0。
我一直在研究NoneType解决方案文章（http://www.pyimagesearch.com/2016/12/26/opencv-resolving-nonetype-errors/）从此我得出结论相机功能齐全，我可以拍摄raspstill并录制视频。
但我无法通过omxplayer播放视频。当播放细节并度过美好的一天;）显示但没有打开新窗口。这让我觉得它是编解码器或驱动程序的问题。此外，Adrian还发表评论说opencv很可能在没有视频I / O支持的情况下编译。经过数小时的搜索和疑难解答后，我仍然不确定如何解决此错误。
任何帮助将不胜感激！感谢
答案 0 :(得分：0)
这是因为视频读取了最后一帧，并且后面没有任何内容，所以会有“ NoneType”。
解决方案：添加if语句。
if ret == True:
(h, w) = frame.shape [:2]
else:
break