Почему встроенная в apache фляга не находит мою USB-видеокамеру? - PullRequest
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Почему встроенная в apache фляга не находит мою USB-видеокамеру?

0 голосов
/ 19 февраля 2019

Я пытаюсь настроить видеопоток с моей камеры Raspberry Pi на мой веб-сервер с помощью Flask.Все отлично работает с веб-сервером Flask, но после использования apache с flask выдает ошибку. 

 error: /build/opencv-U1UwfN/opencv-2.4.9.1+dfsg1/modules/highgui/src/grfmt_base.cpp:131: error: (-10) Raw image encoder error: Empty JPEG image (DNL not supported) in function throwOnEror

Мой код Python выглядит следующим образом 

if session["logged_in"] == True:
    return Response(gen(VideoCamera()),
    mimetype='multipart/x-mixed-replace; boundary=frame')

Gen: 

def gen(camera):
"""Video streaming generator function."""
while True:
    frame = camera.get_frame()
    yield (b'--frame\r\n'
           b'Content-Type: image/jpeg\r\n\r\n' + frame + b'\r\n')

Модуль камеры 

import cv2


class VideoCamera(object):
    def __init__(self):
        # Using OpenCV to capture from device 0. If you have trouble capturing
        # from a webcam, comment the line below out and use a video file
        # instead.
        self.video = cv2.VideoCapture(0)
        # If you decide to use video.mp4, you must have this file in the folder
        # as the main.py.
        # self.video = cv2.VideoCapture('video.mp4')

    def __del__(self):
        self.video.release()

    def get_frame(self):
        success, image = self.video.read()
        # We are using Motion JPEG, but OpenCV defaults to capture raw images,
        # so we must encode it into JPEG in order to correctly display the
        # video stream.

        if not success:
            print("WARNING ####       No Camera Device available      #### WARNING")

        cv2.imwrite("/static/images/camerapic.png", image)
        ret, jpeg = cv2.imencode('.jpg', image)
        return jpeg.tobytes()

Файл Apache WSGI 

#!/usr/bin/python
import sys
import logging
logging.basicConfig(stream=sys.stderr)
sys.path.insert(0,"/var/www/FlaskApp/")

from flaskapp import app as application
application.secret_key = 'key'

Файл конфигурации Apache 

<VirtualHost *>
    ServerName example.com
    WSGIScriptAlias / /var/www/FlaskApp/app.wsgi

    <Directory /var/www/FlaskApp/>
      Order deny,allow
      Allow from all
    </Directory>

</VirtualHost>

Это полная трассировка стека ошибок 

OpenCV Error: Unknown error code -10 (Raw image encoder error: Empty JPEG 
image (DNL not supported)) in throwOnEror, file /build/opencv-U1UwfN/opencv- 
2.4.9.1+dfsg1/modules/highgui/src/gr                                             
fmt_base.cpp, line 131
[Mon Feb 18 22:30:55.103395 2019] [wsgi:error] [pid 20626] [client 
2a04:4540:470c:9700:3cc7:709c:1408:230b:62003] mod_wsgi (pid=20626): 
Exception occurred processing WSGI script '/var/ww                                             
w/FlaskApp/app.wsgi'.
[Mon Feb 18 22:30:55.103624 2019] [wsgi:error] [pid 20626] [client 
2a04:4540:470c:9700:3cc7:709c:1408:230b:62003] Traceback (most recent call 
last):
[Mon Feb 18 22:30:55.103739 2019] [wsgi:error] [pid 20626] [client 
2a04:4540:470c:9700:3cc7:709c:1408:230b:62003]   File 
"/usr/lib/python2.7/dist-packages/werkzeug/wsgi.py", line 703, in                                              
__next__
[Mon Feb 18 22:30:55.105221 2019] [wsgi:error] [pid 20626] [client 
2a04:4540:470c:9700:3cc7:709c:1408:230b:62003]     return self._next()
[Mon Feb 18 22:30:55.105371 2019] [wsgi:error] [pid 20626] [client 
2a04:4540:470c:9700:3cc7:709c:1408:230b:62003]   File 
"/usr/lib/python2.7/dist-packages/werkzeug/wrappers.py", line 81,                                              
in _iter_encoded
[Mon Feb 18 22:30:55.107921 2019] [wsgi:error] [pid 20626] [client 
2a04:4540:470c:9700:3cc7:709c:1408:230b:62003]     for item in iterable:
[Mon Feb 18 22:30:55.108077 2019] [wsgi:error] [pid 20626] [client 
2a04:4540:470c:9700:3cc7:709c:1408:230b:62003]   File 
"/var/www/FlaskApp/flaskapp.py", line 27, in gen
[Mon Feb 18 22:30:55.108442 2019] [wsgi:error] [pid 20626] [client 
2a04:4540:470c:9700:3cc7:709c:1408:230b:62003]     frame = 
camera.get_frame()
[Mon Feb 18 22:30:55.108526 2019] [wsgi:error] [pid 20626] [client 
2a04:4540:470c:9700:3cc7:709c:1408:230b:62003]   File " 
"/var/www/FlaskApp/camera.py", line 29, in get_frame
[Mon Feb 18 22:30:55.108747 2019] [wsgi:error] [pid 20626] [client 
2a04:4540:470c:9700:3cc7:709c:1408:230b:62003]     ret, jpeg = 
cv2.imencode('.jpg', image)
[Mon Feb 18 22:30:55.108868 2019] [wsgi:error] [pid 20626] [client 
2a04:4540:470c:9700:3cc7:709c:1408:230b:62003] error: /build/opencv- 
U1UwfN/opencv-2.4.9.1+dfsg1/modules/highgui/src/grf                                             
mt_base.cpp:131: error: (-10) Raw image encoder error: Empty JPEG image (DNL 
not 
supported) in function throwOnEror
...