function start()
{
if (!navigator.mediaDevices
|| !navigator.mediaDevices.getUserMedia) {
console.log(‘getUserMedia is not support’);
} else {
var deviceID = videoIP.value;
var constraints = {
video : {
width : 320,
height : 420,
frameRate : 30,
deviceID : deviceID ? deviceID : undefined
},
audio : {
noiseSuppresson : true,
echoCancellation : true,
volume : 0
}
}
navigator.mediaDevices.getUserMedia(constraints)
.then(gotMediaStream)
.then(gotDevices)
.catch(handleError);
}
}