HTML5 video, how to detect when there is no audio track?

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Shorter function based on upuoth’s answer and extended to support IE10+

function hasAudio (video) {
    return video.mozHasAudio ||
    Boolean(video.webkitAudioDecodedByteCount) ||
    Boolean(video.audioTracks && video.audioTracks.length);
}

Usage:

var video = document.querySelector('video');
if(hasAudio(video)) {
    console.log("video has audio");
} else{
    console.log("video doesn't have audio");
}

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