首页 > 解决方案 > FASTAPI:无法呈现 html 页面

问题描述

我正在尝试渲染显示来自网络摄像头的视频捕获的 html 页面。但面临错误: - 500 Server Error TypeError: TemplateResponse() missing 1 required positional argument: 'context'。我在 Flask 中尝试过的相同代码,它在那里工作正常。

from fastapi import FastAPI
import uvicorn
from fastapi import Depends, FastAPI
from fastapi import FastAPI, Request
from fastapi.responses import HTMLResponse
from fastapi.templating import Jinja2Templates
import cv2

app = FastAPI(debug=True)
templates = Jinja2Templates(directory="templates")

@app.get("/")
async def index():
    return templates.TemplateResponse("index.html")


async def gen_frames(camera_id):
    cap=  cv2.VideoCapture(0)

    while True:
        # for cap in caps:
        # # Capture frame-by-frame
        success, frame = cap.read()  # read the camera frame
        if not success:
            break
        else:
            ret, buffer = cv2.imencode('.jpg', frame)
            frame = buffer.tobytes()
            yield (b'--frame\r\n'b'Content-Type: image/jpeg\r\n\r\n' + frame + b'\r\n')  
    
   if __name__ == '__main__':
    uvicorn.run(app,  host="127.0.0.1",port=8000)

我的 HTML 页面是:- index.html

<!doctype html>
<html lang="en">
<head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
          integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">

    <title>Multiple Live Streaming</title>
</head>
<body>
<div class="container">
    <div class="row">
        <div class="col-lg-7">
            <h3 class="mt-5">Multiple Live Streaming</h3>
            <img src="{{ url_for('video_feed', id='0') }}" width="100%">
        </div>


    </div>
</div>
</body>
</html>

任何人都可以帮忙。我在这做错了什么。?相同的代码在 Flask 中工作

错误捕获

标签: pythonfastapi

解决方案


使用模板时需要传递请求。

from fastapi import Request

@app.get("/")
async def index(request: Request):
    return templates.TemplateResponse("index.html", {"request": request})

因此,您还可以使用StreamingResponse将视频作为另一条路径提供

from fastapi.responses import StreamingResponse


@app.get("/serve/{camera_id}", include_in_schema=False)
async def serve_video(camera_id: int):
    return StreamingResponse(gen_frames(camera_id))

然后使用 Ajax 或 Axios 等获取该响应。


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