Web/API/MediaCapabilitiesInfo

The MediaCapabilitiesInfo interface of the Media Capabilities API is made available when the promise returned by the MediaCapabilities.encodingInfo() or MediaCapabilities.decodingInfo() methods of the MediaCapabilities interface fulfills, providing information as to whether the media type is supported, and whether encoding or decoding such media would be smooth and power efficient.

Properties

The MediaCapabilitiesInfo interface contains three Boolean attribues:

supported: Given the properties defined in the MediaConfiguration, can the specified piece of media content be encoded (if MediaEncodingConfiguration is set) or decode (if MediaDecodingConfiguration is set) at all? If yes, supported is true. Otherwise, it is false.
smooth: Given the properties defined in the MediaConfiguration, will the playback of the specified piece of media be high quality? Will it be smooth? If supported is true, and playback will be smooth, smooth is true, Otherwise, is it false.
powerEfficient: Given the properties defined in the MediaConfiguration, will the playback of the specified piece of media be power efficient? If supported is true, and playback will be power efficient, powerEfficient is true, Otherwise, is it false.

Browsers will report a supported media configuration as smooth and powerEfficient until stats on this device have been recorded. All supported audio codecs are reported to be power efficient.

Example

// MediaConfiguration to be tested
const mediaConfig = {
    type : 'file', 
    audio : {
        contentType : "audio/ogg",
        channels : 2,   
        bitrate : 132700, 
        samplerate : 5200 
     }, 
}; 

// check support and performance 
navigator.mediaCapabilities.decodingInfo(mediaConfig).then(result => { // result contains the media capabilities information
    console.log('This configuration is ' +                     
        (result.supported ? '' : 'not ') + 'supported, ' +             // Can the media, as configured, be decoded by the user agent
        (result.smooth ? '' : 'not ') + 'smooth, and ' +               // is it smooth?
        (result.powerEfficient ? '' : 'not ') + 'power efficient.')    // is it power efficient?
});

Specifications

Specification	Status	Comment
Media CapabilitiesThe definition of 'MediaCapabilitiesInfo' in that specification.	Draft	Initial definition

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`MediaCapabilitiesInfo` Experimental'	Chrome Full support 66	Edge Full support ≤79	Firefox Full support 63	IE No support No	Opera ?	Safari ?	WebView Android Full support 66	Chrome Android Full support 66	Firefox Android Full support 63	Opera Android ?	Safari iOS ?	Samsung Internet Android Full support 9.0
`powerEfficient` Experimental'	Chrome Full support 66	Edge Full support ≤79	Firefox Full support 63	IE No support No	Opera ?	Safari ?	WebView Android Full support 66	Chrome Android Full support 66	Firefox Android Full support 63	Opera Android ?	Safari iOS ?	Samsung Internet Android Full support 9.0
`smooth` Experimental'	Chrome Full support 66	Edge Full support ≤79	Firefox Full support 63	IE No support No	Opera ?	Safari ?	WebView Android Full support 66	Chrome Android Full support 66	Firefox Android Full support 63	Opera Android ?	Safari iOS ?	Samsung Internet Android Full support 9.0
`supported` Experimental'	Chrome Full support 66	Edge Full support ≤79	Firefox Full support 63	IE No support No	Opera ?	Safari ?	WebView Android Full support 66	Chrome Android Full support 66	Firefox Android Full support 63	Opera Android ?	Safari iOS ?	Samsung Internet Android Full support 9.0

Legend

Full support: Full support
No support: No support
Compatibility unknown: Compatibility unknown
Experimental. Expect behavior to change in the future.': Experimental. Expect behavior to change in the future.