flask读取服务器信息,使用OpenCV（Python）从Flask服务器读取MJPEG流

我正在使用Flask和flask-restful生成一个MJPEG流。出于原因，我想在另一个Python程序中捕获此流，我使用OpenCV(3)。

问题是请求的第一帧进展顺利。另一方面，未正确接收请求的第二帧(延迟之后)，并抛出错误：

[mpjpeg @ 0000017a86f524a0] Expected boundary '--' not found, instead found a line of 82 bytes

多次。

我相信这是因为手动设置了帧的边界。我将把违规代码放在下面。

MJPEG流生成：

## Controller for the streaming of content.

class StreamContent(Resource):

@classmethod

def setVis(self, vis):

self.savedVis = vis

def get(self):

return Response(gen(VideoCamera(self.savedVis)),

mimetype='multipart/x-mixed-replace; boundary=frame')

## Generate a new VideoCamera and stream the retrieved frames.

def gen(camera):

frame = camera.getFrame()

while frame != None:

yield (b'--frame\r\n'

b'Content-Type: image/jpeg\r\n\r\n' + frame + b'\r\n\r\n')

time.sleep(0.07)

frame = camera.getFrame()

## Allows for the reading of video frames.

class VideoCamera(object):

def __init__(self, vis):

#object we retrieve the frame from.

self.vis = vis

## Get the current frame.

def getFrame(self):

image = self.vis.mat_frame_with_overlay

# 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/image stream.

ret, jpeg = cv2.imencode('.jpg', image)

return jpeg.tobytes()

MJPEG流检索：

"""

Get a single frame from the camera.

"""

class Image(Resource):

def get(self):

camera = VideoCamera()

return Response(camera.getSingleFrame(), mimetype='image/jpeg')

"""

Contains methods for retrieving video information from a source.

"""

class VideoCamera(object):

def __del__(self):

self.video.release()

@classmethod

def setVideo(self, video):

self.video = video

## Get the current frame.

def getSingleFrame(self):

self.startVideoFromSource(self.video)

ret, image = self.video.read()

time.sleep(0.5)