use opencv, cv2.videocapture in kivy with android - python for android

问题

I have been working for few days, for trying to use cv2.VideoCapture() in python-for-android. I'm using kivy with buildozer to build apk for android. Here is my code

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


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):
        print 'hello'
        ret, frame = self.capture.read()
        print frame
    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(1)
        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()


if __name__ == '__main__':
    CamApp().run()

This code is totally running on pc and successfully displaying the video feed, but if I build this to apk file using buildozer it will get crashed as soon as application launched. Can someone help me to fix this issue?? Anyway If anyone have done this please comment..

This is the logcat from android device:

08-14 10:05:16.807 16826-16826/? A/DEBUG: backtrace:
08-14 10:05:16.807 16826-16826/? A/DEBUG:     #00 pc 00018b00    /system/lib/libc.so (strlen+71)
08-14 10:05:16.807 16826-16826/? A/DEBUG:     #01 pc 00505fc9  /data/data/org.test.myapp/files/app/lib/python2.7/site-packages/cv2.so
08-14 10:05:16.807 16826-16826/? A/DEBUG:     #02 pc 005069fb  /data/data/org.test.myapp/files/app/lib/python2.7/site-packages/cv2.so
08-14 10:05:16.807 16826-16826/? A/DEBUG:     #03 pc 00506e0d  /data/data/org.test.myapp/files/app/lib/python2.7/site-packages/cv2.so
08-14 10:05:16.807 16826-16826/? A/DEBUG:     #04 pc 0037a4fb  /data/data/org.test.myapp/files/app/lib/python2.7/site-packages/cv2.so
08-14 10:05:16.807 16826-16826/? A/DEBUG:     #05 pc 0037aa71  /data/data/org.test.myapp/files/app/lib/python2.7/site-packages/cv2.so
08-14 10:05:16.807 16826-16826/? A/DEBUG:     #06 pc 0037261d  /data/data/org.test.myapp/files/app/lib/python2.7/site-packages/cv2.so
08-14 10:05:16.807 16826-16826/? A/DEBUG:     #07 pc 0037291b  /data/data/org.test.myapp/files/app/lib/python2.7/site-packages/cv2.so
08-14 10:05:16.807 16826-16826/? A/DEBUG:     #08 pc 003729ff  /data/data/org.test.myapp/files/app/lib/python2.7/site-packages/cv2.so
08-14 10:05:16.807 16826-16826/? A/DEBUG:     #09 pc 0015cf2b  /data/data/org.test.myapp/files/app/lib/python2.7/site-packages/cv2.so
08-14 10:05:16.807 16826-16826/? A/DEBUG:     #10 pc 000603c5  /data/app/org.test.myapp-1/lib/arm/libpython2.7.so (PyCFunction_Call+144)

来源：https://stackoverflow.com/questions/45659872/use-opencv-cv2-videocapture-in-kivy-with-android-python-for-android

标签

android

python

OpenCV

kivy

buildozer