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错误：（-215：断言失败）函数“imshow”中的 size.width>0 && size.height>0

[英]error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'imshow'

 原文  2019-09-28 20:23:45  6   1    python/ opencv

问题描述

For below code I am getting Assertion failed error as highlighted in title.对于下面的代码，我收到标题中突出显示的断言失败错误。

cap = cv2.VideoCapture('vtest.avi')
ret, frame = cap.read()
cv2.imshow("Feed", frame)

while cap.isOpened():
    ret, frame = cap.read()
    cv2.imshow("Feed", frame)

Error - cv2.error: OpenCV(4.1.1) /Users/travis/build/skvark/opencv-python/opencv/modules/highgui/src/window.cpp:352: error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'imshow'

In order to remove the path as suspect - video is same folder where I am code.为了删除可疑路径 - 视频与我所在的代码所在的文件夹相同。 I verified the path by replacing with image and it works fine.我通过用图像替换来验证路径并且它工作正常。

I also verified I am able to open the video.我还验证了我能够打开视频。 Since I am on Mac - I tried with VLC and even converted the format to.mp4 for it support default quicktime player but still same error.由于我使用的是 Mac - 我尝试使用 VLC，甚至将格式转换为 .mp4，因为它支持默认的 quicktime 播放器，但仍然出现同样的错误。 If I just try to get image from video I do first frame - I have commented that code above.如果我只是尝试从视频中获取图像，我会先做第一帧——我已经在上面评论了该代码。

If I try below set of code如果我尝试下面的代码集

while cap.isOpened():
    ret, frame = cap.read()
    if ret == True:
        cv2.imshow("Feed", frame)

I no longer see above assertion failed error but the feed frame window opens and just hangs我不再看到上面的断言失败错误，但提要框架窗口打开并挂起

I see it as common error when video or file is not available for being read by cv2.imshow().当视频或文件不可用于 cv2.imshow() 读取时，我将其视为常见错误。 I went through quite a few suggestions given around this in SO but somehow nothing worked for me.我在 SO 中通过了很多关于此的建议，但不知何故对我没有任何帮助。

1 个解决方案

解决方案1
 1  2019-10-03 23:20:25

You need to add你需要添加

if cv2.waitKey(1) & 0xFF == ord('q'):
    break

after cv2.imshow() .在cv2.imshow()之后。 I've encountered the same issue before, and adding that worked for me.我以前遇到过同样的问题，添加它对我有用。

解决方案2
 0  2020-12-24 20:30:25

For below code I am getting Assertion failed error as highlighted in title.对于下面的代码，我收到了标题中突出显示的 Assertion failed 错误。

cap = cv2.VideoCapture('vtest.avi')
ret, frame = cap.read()
cv2.imshow("Feed", frame)

while cap.isOpened():
    ret, frame = cap.read()
    cv2.imshow("Feed", frame)

Error - cv2.error: OpenCV(4.1.1) /Users/travis/build/skvark/opencv-python/opencv/modules/highgui/src/window.cpp:352: error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'imshow'

In order to remove the path as suspect - video is same folder where I am code.为了删除可疑路径 - 视频与我所在的代码文件夹相同。 I verified the path by replacing with image and it works fine.我通过替换图像验证了路径，它工作正常。

I also verified I am able to open the video.我还验证了我可以打开视频。 Since I am on Mac - I tried with VLC and even converted the format to.mp4 for it support default quicktime player but still same error.由于我在 Mac 上 - 我尝试使用 VLC，甚至将格式转换为 .mp4，因为它支持默认的 quicktime 播放器，但仍然出现相同的错误。 If I just try to get image from video I do first frame - I have commented that code above.如果我只是尝试从视频中获取图像，我会做第一帧 - 我已经在上面评论了该代码。

If I try below set of code如果我尝试下面的代码集

while cap.isOpened():
    ret, frame = cap.read()
    if ret == True:
        cv2.imshow("Feed", frame)

I no longer see above assertion failed error but the feed frame window opens and just hangs我不再看到上述断言失败错误，但馈送框架 window 打开并挂起

I see it as common error when video or file is not available for being read by cv2.imshow().当 cv2.imshow() 无法读取视频或文件时，我将其视为常见错误。 I went through quite a few suggestions given around this in SO but somehow nothing worked for me.我在 SO 中提出了很多关于这个问题的建议，但不知何故对我没有任何帮助。

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