Javascript 获取用户视频流时,我的网络摄像头会打开,但视频流不会';不显示
下面是关于face-api.js的教程: 但当我启动代码时,我的网络摄像头显示它正在工作,但它不会显示在浏览器中。当我在chrome中检查它时,它说:Name:无法播放媒体 代码(不包括API): index.html:Javascript 获取用户视频流时,我的网络摄像头会打开,但视频流不会';不显示,javascript,html,artificial-intelligence,Javascript,Html,Artificial Intelligence,下面是关于face-api.js的教程: 但当我启动代码时,我的网络摄像头显示它正在工作,但它不会显示在浏览器中。当我在chrome中检查它时,它说:Name:无法播放媒体 代码(不包括API): index.html: <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script defer src="face-api.min.js"></script>
<script defer src="script.js"></script>
<style>
body {
margin: 0;
padding: 0;
width: 100vw;
height: 100vh;
display: flex;
justify-content: center;
align-items: center;
}
canvas {
position: absolute;
}
</style>
</head>
<body>
<video id="video" width="720" height="560" autoplay muted></video>
</body>
</html>
我经常遇到这样的情况,由于缺乏USB带宽,网络摄像头的要求分辨率高于实际工作分辨率。虽然在您的情况下,您根本没有指定约束。。。这应该一直有效。您可以尝试将帧大小设置为640x480,看看会发生什么。我经常遇到这种情况,因为缺少USB带宽,网络摄像头的要求分辨率高于实际工作分辨率。虽然在您的情况下,您根本没有指定约束。。。这应该一直有效。您可以尝试将帧大小设置为640x480,看看会发生什么。
const video = document.getElementById('video')
Promise.all([
faceapi.nets.tinyFaceDetector.loadFromUri('/models'),
faceapi.nets.faceLandmark68Net.loadFromUri('/models'),
faceapi.nets.faceRecognitionNet.loadFromUri('/models'),
faceapi.nets.faceExpressionNet.loadFromUri('/models')
]).then(startVideo)
function startVideo() {
navigator.mediaDevices.getUserMedia(
{ video: {} },
stream => video.srcObject = stream,
err => console.error(err)
)
}
video.addEventListener('play', () => {
const canvas = faceapi.createCanvasFromMedia(video)
document.body.append(canvas)
const displaySize = { width: video.width, height: video.height }
faceapi.matchDimensions(canvas, displaySize)
setInterval(async () => {
const detections = await faceapi.detectAllFaces(video, new faceapi.TinyFaceDetectorOptions()).withFaceLandmarks().withFaceExpressions()
const resizedDetections = faceapi.resizeResults(detections, displaySize)
canvas.getContext('2d').clearRect(0, 0, canvas.width, canvas.height)
faceapi.draw.drawDetections(canvas, resizedDetections)
faceapi.draw.drawFaceLandmarks(canvas, resizedDetections)
faceapi.draw.drawFaceExpressions(canvas, resizedDetections)
}, 100)
})