How to play only the audio of a Youtube video using HTML 5?

Is it possible to play only the audio from a YouTube video using HTML 5 and Javascript?

Answers:

Answer

Embed the video player and use CSS to hide the video. If you do it properly you may even be able to hide only the video and not the controls below it.

However, I'd recommend against it, because it will be a violation of YouTube TOS. Use your own server instead if you really want to play only audio.

Answer

You can parse Youtube meta file for all streams available for this particular video id using this link: https://www.youtube.com/get_video_info?video_id={VID} and extract audio only streams.

Here is an example with public Google Image proxy (but you can use any free or your own CORS proxy):

var vid = "3r_Z5AYJJd4",
    audio_streams = {},
    audio_tag = document.getElementById('youtube');

fetch("https://"+vid+"-focus-opensocial.googleusercontent.com/gadgets/proxy?container=none&url=https%3A%2F%2Fwww.youtube.com%2Fget_video_info%3Fvideo_id%3D" + vid).then(response => {
    if (response.ok) {
        response.text().then(data => {

            var data = parse_str(data),
                streams = (data.url_encoded_fmt_stream_map + ',' + data.adaptive_fmts).split(',');

            streams.forEach(function(s, n) {
                var stream = parse_str(s),
                    itag = stream.itag * 1,
                    quality = false;
                console.log(stream);
                switch (itag) {
                    case 139:
                        quality = "48kbps";
                        break;
                    case 140:
                        quality = "128kbps";
                        break;
                    case 141:
                        quality = "256kbps";
                        break;
                }
                if (quality) audio_streams[quality] = stream.url;
            });

            console.log(audio_streams);

            audio_tag.src = audio_streams['128kbps'];
            audio_tag.play();
        })
    }
});

function parse_str(str) {
    return str.split('&').reduce(function(params, param) {
        var paramSplit = param.split('=').map(function(value) {
            return decodeURIComponent(value.replace('+', ' '));
        });
        params[paramSplit[0]] = paramSplit[1];
        return params;
    }, {});
}
<audio id="youtube" autoplay controls loop></audio>

Doesn't work for all videos, very depends on monetization settings or something like that.

Answer

This may be an old post but people could still be searching for this so here you go:

<div style="position:relative;width:267px;height:25px;overflow:hidden;">
<div style="position:absolute;top:-276px;left:-5px">
<iframe width="300" height="300" 
  src="https://www.youtube.com/embed/youtubeID?rel=0">
</iframe>
</div>
</div>
Answer

The answer is simple: Use a 3rd party product like jwplayer or similar, then set it to the minimal player size which is the audio player size (only shows player controls).

Voila.

Been using this for over 8 years.

Answer

VIDEO_ID with actual ID of your YouTube video.

<div data-video="VIDEO_ID"  
        data-autoplay="0"         
        data-loop="1"             
        id="youtube-audio">
 </div>

 <script src="https://www.youtube.com/iframe_api"></script>
 <script src="https://cdn.rawgit.com/labnol/files/master/yt.js"></script>
Answer

I agree with Tom van der Woerdt. You could use CSS to hide the video (visibility:hidden or overflow:hidden in a div wrapper constrained by height), but that may violate Youtube's policies. Additionally, how could you control the audio (pause, stop, volume, etc.)?

You could instead turn to resources such as http://www.houndbite.com/ to manage audio.

Answer

Adding to the mentions of jwplayer and possible TOS violations, I would like to to link to the following repository on github: YouTube Audio Player Generation Library, that allows to generate the following output:

enter image description here

Library has the support for the playlists and PHP autorendering given the video URL and the configuration options.

Answer

var vid = "bpt84ceWAY0",
    audio_streams = {},
    audio_tag = document.getElementById('youtube');

fetch("https://"+vid+"-focus-opensocial.googleusercontent.com/gadgets/proxy?container=none&url=https%3A%2F%2Fwww.youtube.com%2Fget_video_info%3Fvideo_id%3D" + vid).then(response => {
    if (response.ok) {
        response.text().then(data => {

            var data = parse_str(data),
                streams = (data.url_encoded_fmt_stream_map + ',' + data.adaptive_fmts).split(',');

            streams.forEach(function(s, n) {
                var stream = parse_str(s),
                    itag = stream.itag * 1,
                    quality = false;
                console.log(stream);
                switch (itag) {
                    case 139:
                        quality = "48kbps";
                        break;
                    case 140:
                        quality = "128kbps";
                        break;
                    case 141:
                        quality = "256kbps";
                        break;
                }
                if (quality) audio_streams[quality] = stream.url;
            });

            console.log(audio_streams);

            audio_tag.src = audio_streams['128kbps'];
            audio_tag.play();
        })
    }
});

function parse_str(str) {
    return str.split('&').reduce(function(params, param) {
        var paramSplit = param.split('=').map(function(value) {
            return decodeURIComponent(value.replace('+', ' '));
        });
        params[paramSplit[0]] = paramSplit[1];
        return params;
    }, {});
}
<audio id="youtube" autoplay controls loop></audio>

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