这个是对的啊，可以修改自己上传的视频流分辨率：
```js
const constraints = {
width: {min: 640, ideal: 1280},
height: {min: 480, ideal: 720},
advanced: [{width: 1920, height: 1280},{aspectRatio: 1.333}]
};
navigator.mediaDevices.getUserMedia({ video: true })
.then(mediaStream => {
const track = mediaStream.getVideoTracks()[0];
track.applyConstraints(constraints)
.then(() => {
// Do something with the track such as using the Image Capture API.
})
.catch(e => {
// The constraints could not be satisfied by the available devices.
});
});
```
