response motion jpeg - jenhaoyang/backend_blog GitHub Wiki

def generate():
    # grab global references to the output frame and lock variables
    global outputFrame, lock
    # loop over frames from the output stream
    while True:
        # wait until the lock is acquired
        with lock:
            # check if the output frame is available, otherwise skip
            # the iteration of the loop
            if outputFrame is None:
                continue
            # encode the frame in JPEG format
            (flag, encodedImage) = cv2.imencode(".jpg", outputFrame)
            # ensure the frame was successfully encoded
            if not flag:
                continue
        # yield the output frame in the byte format
        yield b''+bytearray(encodedImage)

In the video_feed function, in the media_type parameter, it was just to put it in the same way as in the flask:

@app.get("/")
def video_feed():
    # return the response generated along with the specific media
    # type (mime type)
    # return StreamingResponse(generate())
    return StreamingResponse(generate(), media_type="multipart/x-mixed-replace;boundary=frame")

And in the function generate:

yield (b'--frame\r\n' b'Content-Type: image/jpeg\r\n\r\n' +
               bytearray(encodedImage) + b'\r\n')

參考:
https://stackoverflow.com/q/65971081
https://www.pyimagesearch.com/2019/09/02/opencv-stream-video-to-web-browser-html-page/