Question

我有一个Kivy应用程序，我正在尝试从我的摄像头摄像头拍摄视频，将其放在我计算机上的应用程序中。我在网上得到了这个代码： -

from kivy.app import App
from kivy.lang import Builder

kv = '''
BoxLayout:
    orientation: 'vertical'
    Camera:
        id: camera
        resolution: (640, 480)
        play: False
    ToggleButton:
        text: 'Play'
        on_press: camera.play = not camera.play
        size_hint_y: None
        height: '48dp'
'''


class TestCamera(App):
    def build(self):
        return Builder.load_string(kv)

TestCamera().run()

我收到一条错误，指出VideoCapture：在kivy / core / camera / camera_videocaputure中找不到分辨率。我想出了许多不同的方法但我无法解决查询。如果有人能帮我解决它会很棒。谢谢！

错误Traceback是：

Traceback (most recent call last):
 File "C:\Users\User\Desktop\personal work\BinaryHeap.py", line 23, in     <module>
     TestCamera().run()


   File "C:\Users\User\Desktop\personal work\Anaconda3\envs\py27\lib\site-packages\kivy\app.py", line 802, in run
     root = self.build()
   File "C:\Users\User\Desktop\personal work\BinaryHeap.py", line 21, in build
     return Builder.load_string(kv)
   File "C:\Users\User\Desktop\personal work\Anaconda3\envs\py27\lib\site-packages\kivy\lang.py", line 1921, in load_string
     self._apply_rule(widget, parser.root, parser.root)
   File "C:\Users\User\Desktop\personal work\Anaconda3\envs\py27\lib\site-packages\kivy\lang.py", line 2130, in _apply_rule
     e), cause=tb)
 BuilderException: Parser: File "<inline>", line 6:
 ...
       4:    Camera:
       5:        id: camera
 >>    6:        resolution: (640, 480)
       7:        play: False
       8:    ToggleButton:
 ...
 Exception: VideoCapture: Resolution not supported
   File "C:\Users\User\Desktop\personal work\Anaconda3\envs\py27\lib\site-packages\kivy\lang.py", line 2123, in _apply_rule
     setattr(widget_set, key, value)
   File "kivy\weakproxy.pyx", line 22, in kivy.weakproxy.WeakProxy.__setattr__ (kivy\weakproxy.c:1235)
   File "kivy\properties.pyx", line 408, in kivy.properties.Property.__set__ (kivy\properties.c:5114)
   File "kivy\properties.pyx", line 733, in kivy.properties.ListProperty.set (kivy\properties.c:11127)
   File "kivy\properties.pyx", line 446, in kivy.properties.Property.set (kivy\properties.c:5876)
   File "kivy\properties.pyx", line 501, in kivy.properties.Property.dispatch (kivy\properties.c:6557)
   File "kivy\_event.pyx", line 1224, in kivy._event.EventObservers.dispatch (kivy\_event.c:13497)
   File "kivy\_event.pyx", line 1130, in kivy._event.EventObservers._dispatch (kivy\_event.c:12696)
   File "C:\Users\User\Desktop\personal work\Anaconda3\envs\py27\lib\site-packages\kivy\uix\camera.py", line 103, in _on_index
     resolution=self.resolution, stopped=True)
   File "C:\Users\User\Desktop\personal work\Anaconda3\envs\py27\lib\site-packages\kivy\core\camera\camera_videocapture.py", line 26, in __init__
     super(CameraVideoCapture, self).__init__(**kwargs)
   File "C:\Users\User\Desktop\personal work\Anaconda3\envs\py27\lib\site-packages\kivy\core\camera\__init__.py", line 70, in __init__
     self.init_camera()
   File "C:\Users\User\Desktop\personal work\Anaconda3\envs\py27\lib\site-packages\kivy\core\camera\camera_videocapture.py", line 36, in init_camera
     raise Exception('VideoCapture: Resolution not supported')

[ - 1，-1]也不起作用只是为我提供了一个空白屏幕。如果有人试一试，请告诉他们是否适用于他们？有没有其他方法可以让相机工作？

from kivy.app import App
from kivy.uix.image import Image
from kivy.clock import Clock
from kivy.graphics.texture import Texture
import cv2
from kivy.uix.camera import Camera 

class KivyCamera(Image):
    def __init__(self, capture, fps, **kwargs):
        super(KivyCamera, self).__init__(**kwargs)
        self.capture = capture
        Clock.schedule_interval(self.update, 1.0 / fps)

    def update(self, dt):
        ret, frame = self.capture.read()
        if ret:
            # convert it to texture
            buf1 = cv2.flip(frame, 0)
            buf = buf1.tostring()
            image_texture = Texture.create(size=(frame.shape[1], frame.shape[0]), colorfmt='bgr')
            image_texture.blit_buffer(buf, colorfmt='bgr', bufferfmt='ubyte')
            # display image from the texture
            self.texture = image_texture


class CamApp(App):
    def build(self):
        self.capture = cv2.VideoCapture(0)
        self.my_camera = KivyCamera(capture=self.capture, fps=30)
        return self.my_camera

    def on_stop(self):
        #without this, app will not exit even if the window is closed
        self.capture.release()


CamApp().run()

以上代码适用于我，但我不知道如何将其更改为kivy文件。所以我很感激任何帮助。谢谢。我拍了一张照片，我的相机分辨率是1920 x 1080.我只是觉得它可能会有所帮助。

Answer 1

我没有评论的声誉所以我会留在这里。你的脚本在我的笔记本电脑上运行正常。我已经尝试了几种分辨率并支持所有分辨率：1920x1080,640x480,320x240。检查您的kivy和OpenCV版本。我的是： OpenCV 2.4.12 Kivy v1.9.0 Python v2.7.8

Answer 2

嗨，所以我在Windows 7上运行该程序，它的工作原理！我不确定它是否是操作系统问题，但它正在工作。因此，如果某人使其适用于Windows 8或10，请发表评论。我浪费了很多时间来调试这个，并且无法让它在这两个操作系统上运行。好吧无论如何，谢天谢地让它工作，谢谢你dizcza你的回复。这真的很有帮助。我做了你的投票，但由于我的低声誉而没有出现。

Answer 3

pip安装opencv-python

从这里：https://pypi.org/project/opencv-python/为我修复了它。

Windows 10，Python 3.6，Kivy 1.11.1

Answer 4

如果您正在使用anaconda spyder应用程序运行此脚本，那么这就是您收到该错误的真正原因（我有同样的错误）。尝试使用安装了kivy软件包的其他编辑器（尝试Pycharm）

Answer 5

def test_camera_resolutions(self, source, size):
    cap = cv2.VideoCapture(source) 
    w, h = size

    cap.set(cv2.CAP_PROP_FRAME_WIDTH, w)
    cap.set(cv2.CAP_PROP_FRAME_HEIGHT, h)

    if cap is None or not cap.isOpened():
        print('Camera do not effort this resolutions!')

Kivy错误Camera Webcam提供错误VideoCapture：未找到分辨率

5 个答案: