我试图从Docker中运行的烧瓶应用程序打开相机时会遇到此错误： 172.17.0.1-- [17/MAR/2025 11:24:10]“ GET/HTTP/1.1” 200- [2025-03-17 11：24：19,498]应用中的错误：exce ...

Question

我的代码：

def detect_faces_api():

    timestamp = int(time.time())
    video_capture = cv2.VideoCapture(0,cv2.CAP_DSHOW)
    
    image = request.files['image']
    image_path = '/face_app/'+str(timestamp)+ '.jpg'
    image.save(image_path)

    result = detect_faces(image_path, video_capture) 

    video_capture.release()
    cv2.destroyAllWindows()

我需要在Linux服务器中运行此应用程序 有人可以帮我吗？

在我的计算机上运行时，该应用程序正常运行，但我在Docker中会遇到此错误 我确实有video_capture = cv2.VIDEOCAPTURE（0），但我得到了错误

72.17.0.1 - - [14/Mar/2025 15:45:53] "GET / HTTP/1.1" 200 -
[ WARN:[email protected]] global cap_v4l.cpp:913 open VIDEOIO(V4L2:/dev/video0): can''t open camera by index
[ERROR:[email protected]] global obsensor_uvc_stream_channel.cpp:158 getStreamChannelGroup Camera index out of range
[2025-03-14 15:46:02,507] ERROR in app: Exception on /detect_faces [POST]
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1511, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 919, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 917, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 902, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)  # type: ignore[no-any-return]
  File "/face_app/face_recognition_.py", line 113, in detect_faces_api
    result = detect_faces(image_path, video_capture)
  File "/face_app/face_recognition_.py", line 48, in detect_faces
    small_frame = cv2.resize(frame, (0, 0), fx=0.25, fy=0.25)
cv2.error: OpenCV(4.11.0) /io/opencv/modules/imgproc/src/resize.cpp:4208: error: (-215:Assertion failed) !ssize.empty() in function 'resize'

I还尝试了CV2.VIDECAPTURE（1），CV2.VIDEOCAPTURE（2），CV2.VIDECAPTURE（-1），CV2.VIDECAPTURE（1，CV2.CAP_V4L2）和所有内容

我的dockerfile

FROM python:3.9-slim

RUN apt-get update && apt-get install -y \
    build-essential \
    cmake \
    gfortran \
    wget \
    libboost-all-dev \
    libatlas-base-dev \
    libopenblas-dev \
    liblapack-dev \
    libx11-dev \
    tesseract-ocr \
    libgl1-mesa-glx \
    libglib2.0-0 \
    libsm6 \
    libxrender1 \
    libxext6 \
    && rm -rf /var/lib/apt/lists/*


COPY requirements.txt /face_app/
RUN pip install --no-cache-dir -r /face_app/requirements.txt

WORKDIR /face_app

COPY . /face_app

EXPOSE 5000

ENV NAME=World

CMD ["python", "face_recognition_.py"]

docker build -t docker-face-app.

我如何运行该应用程序：

docker Run -P 5000：5000 Docker-Face-App

我的错误是两次打电话给视频贴

ERROR in app: Exception on /detect_faces [POST]

制定整个程序停止

将图像路径和删除视频捕获在函数之外固定了错误，并且在这种情况下CV2.VIDECAPTURE（0，CV2.CAP_DSHOW）是正确的：）

Answer 1