media-capabilities-video.js

if ('mediaCapabilities' in navigator && 'encodingInfo' in navigator.mediaCapabilities) {
  const videoFileConfiguration = {
    type : 'record', 
    video : {
        contentType: "video/webm;codecs=vp8",
        width: 1920,
        height: 1080,  
        bitrate: 2500000, 
        framerate: 30, 
    } 
  }; 

  navigator.mediaCapabilities.encodingInfo(videoFileConfiguration).then(result => { 
    console.log('This configuration is ' +                     
        (result.supported ? '' : 'not ') + 'supported, ' +           
        (result.smooth ? '' : 'not ') + 'smooth, and ' +            
        (result.powerEfficient ? '' : 'not ') + 'power efficient.') 
    })
    .catch((e) => {
      console.log("encodingInfo error: " + e)
    });
}