尝试使用世博相机，但检测无效

问题描述

startVideo 功能与笔记本电脑的网络摄像头一起正常工作，但不能与手机摄像头一起使用，然后我参考了 expo 文档，然后使用了 expo-camera，它可以在网络摄像头和手机摄像头中实现。通过使用相机，它不会检测任何结果，如年龄、性别、地标、表情

    function App() {
      const videoHeight = 480;
      const videoWidth = 640;
      const [initializing,setIntializing] = useState(false);
      const videoRef = useRef().current;
      const canvasRef = useRef();
     
      useEffect(()=>{
        const loadModels = async() => {
          const MODEL_URL = process.env.PUBLIC_URL + './models';
          setIntializing(true);
          Promise.all([
            faceapi.nets.tinyFaceDetector.loadFromUri(MODEL_URL),faceapi.nets.faceLandmark68Net.loadFromUri(MODEL_URL),faceapi.nets.faceRecognitionNet.loadFromUri(MODEL_URL),faceapi.nets.faceExpressionNet.loadFromUri(MODEL_URL),faceapi.nets.ageGenderNet.loadFromUri(MODEL_URL)
          ]).then(startVideo);
        }
        loadModels();
      },[canvasRef])
    
      const startVideo =()=>{    
        navigator.getUserMedia({
          video : {}
          },stream => videoRef.current.srcObject = stream,function(err) {
          console.log("The following error occurred: " + err.name);
       })
      }
    
      const handleVideoOnPlay =() =>{
        setInterval(async () =>{
          if(initializing){
            setIntializing(false);
          }
          canvasRef.current.innerHTML = faceapi.createCanvasFromMedia(videoRef.current);
          const displaySize ={
            width : videoWidth,height : videoHeight
          }
          faceapi.matchDimensions(canvasRef.current,displaySize);
          const detections = await faceapi.detectAllFaces(videoRef.current,new faceapi.TinyFaceDetectorOptions()).withFaceLandmarks().withFaceExpressions().withAgeAndGender();
          const resizedDetections = faceapi.resizeResults(detections,displaySize);
          canvasRef.current.getContext('2d').clearRect(0,videoWidth,videoHeight);
          faceapi.draw.drawDetections(canvasRef.current,resizedDetections);
          faceapi.draw.drawFaceLandmarks(canvasRef.current,resizedDetections);
          faceapi.draw.drawFaceExpressions(canvasRef.current,resizedDetections);
          console.log(detections)
        },1000)
      }
      return (
        <div className = "App">
          <span>{initializing ? 'initializing' : 'Ready'}</span>
        <Camera>
          <div className= "display-flex justify-content-center">
            <video ref ={videoRef} autoPlay muted height ={videoHeight} width={videoWidth} onPlay={handleVideoOnPlay}/>
            <canvas ref={canvasRef} className="position-absolute"/>
            </div>
        </Camera>
        </div>
      );
    }        
    export default App;

解决方法

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