letochagone.github.io/testwebcamresolution.html at master · letochagone/letochagone.github.io · GitHub

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<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title></title>
  <meta name="author" content="">
  <meta name="description" content="">


<style type="text/css">
        html, body {
            height: 100%;
            margin: 0;
        }

video {
  display: block;
}
    </style>


</head>

<body>


<p>resolution of your webcam by defaut :</p>
<div id="thediv"></div>


    <input type="number" id="wx"  >
                <input type="number" id="wy" >


<script type="text/javascript">

const constraints = {
        audio: false,

        video: {
                  facingMode:  "user" ,
                  width:640,
                  height:480


        }
      };

let wx = document.querySelector("#wx");
let wy = document.querySelector("#wy");

wx.addEventListener('change',
        event => {
          constraints.video.width={};
                  //  constraints.video.width.min=Number(event.target.value);
                                  //      constraints.video.width.max=Number(event.target.value);
                                                           constraints.video.width.ideal=Number(event.target.value);


                }
    );
wy.addEventListener('change',
        event => {
                    constraints.video.height={};

                                //  constraints.video.height.min=Number(event.target.value);
                                  //      constraints.video.height.max=Number(event.target.value);
                                                         constraints.video.height.ideal=Number(event.target.value);
            console.log(constraints.video);
            //video=null;
            //video = document.querySelector('video');
                    start();
                }
    );


const start =function() {


    navigator.mediaDevices.getUserMedia(constraints).then(function(mediaStream){

      const elem = document.querySelector('#vid');
      if (elem) {
        elem.parentNode.removeChild(elem);
      }

      let video = document.createElement('video');
      video.setAttribute("id", "vid");
      video.srcObject = mediaStream;
      video.play();
      document.body.appendChild(video);

      getVideoDimensionsOf(mediaStream,video).then(({width, height}) => {
        document.getElementById("thediv").innerHTML =
          " B width: " + width +" , height: " + height;
        });
    }).catch(function(err){
        console.log("yikes, and err!" + err.message);
    });

}

function getVideoDimensionsOf(url,vid){
  return new Promise(function(resolve){
    //let video = document.createElement('video');
    vid.addEventListener( "loadedmetadata", function () {
      let height = this.videoHeight;
      let width = this.videoWidth;
      resolve({
        height : height,
        width : width
      });
    }, false );

    //vid.srcObject = url;
  });
}


window.addEventListener("load", start);


</script>


</body>

</html>