Return still image when requested about flask-video-streaming

[askpatrickw]

Sounds good, for future searchers, this mostly works...

#!/usr/bin/env python
from importlib import import_module
import os
from flask import Flask, render_template, Response

# import camera driver
# Valid values for Camera Library are:
# pi for Picamera
# pi2 for Picamera2
# opencv for opencv
if os.environ.get("CAMERA"):
    Camera = import_module("camera_" + os.environ["CAMERA"]).Camera
else:
    # Camera Emulator with 1.jpg, 2.jpg, 3.jpg
    from camera import Camera

app = Flask(__name__)

@app.route("/")
def index():
    """Video streaming home page."""
    return render_template("index.html")


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


@app.route("/video_feed")
def video_feed():
    """Video streaming route. Put this in the src attribute of an img tag."""
    return Response(
        gen(Camera()), mimetype="multipart/x-mixed-replace; boundary=frame"
    )


@app.route("/thumbnail")
def get_thumbnail():
    """ After the camera stops, this no longer works.
    """
    frame = Camera().get_frame()
    return Response(frame, mimetype="image/jpeg")


if __name__ == "__main__":
    app.run(host="0.0.0.0", threaded=True)

It moves the loading of the correct libraries to the else and adds a thumbnail route.

It does seem to have some sort of timing issue when adding the MJPEG config in Home Assistant. Sometimes the thumbnail doesn't validate. If I figure out a better solution, I'll post another comment on this closed issue. I think I fixed that.

[miguelgrinberg]

I don't see this as part of this project. The idea of this repository is to demonstrate how to implement the video streaming aspect, and the intention is for this code to be a companion to my blog articles on this topic. Adding other features would make more sense on a dedicated project, which you may want to based off of this code, if you like.