blocks|key|2200334|text|关于YouTube+API的服务条款|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2200335|https://developers.google.com/youtube/terms/developer-policies|offset|length|2200336|你不能:|style|BOLD|2200337|分离、隔离或修改通过YouTube+API提供的任何YouTube视听内容的音频或视频组件；
单独推广通过YouTube+API提供的任何YouTube视听内容的音频或视频组件；|blockquote|2200338|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1Q|0|0|0|4|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@$D|V|E|W|1|X]]|A|$]]|$1|F|3|G|5|6|7|Y|8|@$D|Z|E|10|H|I]]|9|@]|A|$]]|$1|J|3|K|5|L|7|11|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|C]]]]

Regarding the Terms of Service of the YouTube API 

<a href="https://developers.google.com/youtube/terms/developer-policies" rel="nofollow noreferrer">https://developers.google.com/youtube/terms/developer-policies</a>

YOU CAN'T :

<blockquote>
 separate, isolate, or modify the audio or video components of any
 YouTube audiovisual content made available through the YouTube API;
 
 promote separately the audio or video components of any YouTube
 audiovisual content made available through the YouTube API;
</blockquote>

blocks|key|2200387|text|是的，你可以|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2200388|是的，这当然是可能的，以下是一个API：|2200389|https://market.mashape.com/ehmo/savedeo|blockquote|2200390|虽然它违背了YouTube的服务条款，但从技术上讲，它是有可能黑进仅音频下载链接的，这就是API上面的工作方式。|2200391|这就是我想象的SaveDeo+API如何发挥它的魔力：仅从youtube视频下载音频|2200392|SaveDeo的人是这么跟我说的：|2200393|Youtube上只有音频文件。Savedeo除了给你提供链接之外，什么也不做。我们是怎么做到的，这就是你为什么要使用savedeo的原因，不是吗？|2200394|entityMap|0|LINK|mutability|MUTABLE|url|1|https://stackoverflow.com/questions/15241076/download-only-audio-from-a-youtube-video^0|0|6|0|0|0|13|0|0|0|R|F|1|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|14|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|15|8|@]|D|@$9|16|A|17|1|18]]|E|$]]|$1|K|3|L|5|6|7|19|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|1A|8|@]|D|@$9|1B|A|1C|1|1D]]|E|$]]|$1|O|3|P|5|6|7|1E|8|@]|D|@]|E|$]]|$1|Q|3|R|5|J|7|1F|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1G|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|I]]|Z|$5|V|W|X|E|$Y|10]]]]

YES YOU CAN

Yes, it is certainly possible, here is an API for that:

<blockquote>
 <a href="https://market.mashape.com/ehmo/savedeo" rel="noreferrer">https://market.mashape.com/ehmo/savedeo</a>
</blockquote>

While it is against YouTube Terms of Service, it is technically possible to hack your way to the audio-only download link, and that's how the API's above work. 

The is how I imagine the SaveDeo API does its magic:
<a href="https://stackoverflow.com/questions/15241076/download-only-audio-from-a-youtube-video">Download ONLY audio from a youtube video</a>

This is what the guy at SaveDeo told me:

<blockquote>
 Youtube has audio only files. Savedeo doesn't do anything beyond
 providing you with the link. How we're doing this is the reason why
 are you using savedeo, isn't it.
</blockquote>

blocks|key|964702|text|嗯，我知道这是一个旧的帖子，但我仍然张贴我的答案，因为它仍然没有回答。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|964703|我知道下载视频是违反youtube政策的，但有一种方法可以将youtube视频作为音频/mp3文件下载。|964704|首先是：http://api.youtube6download.top这些家伙将为您提供一种最简单的方法，通过使用那里的HTML链接、Javascript/iframe小部件将yt转换为mp3。|offset|length|964705|我还在mashape：https://market.mashape.com/CoolGuruji/youtube-to-mp3-download上看到了他们的API|964706|您只需输入youtube视频id，它将获取/转换youtube视频为音频格式。|964707|这并不是youtube本身的官方API。|964708|我在我的网站上使用它，它对我很好。|964709|我希望现在这个问题能够得到真正的回答。|964710|entityMap|0|LINK|mutability|MUTABLE|url|http://api.youtube6download.top/|1|https://market.mashape.com/CoolGuruji/youtube-to-mp3-download^0|0|0|4|V|0|0|B|1P|1|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|12|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|13|8|@]|9|@$F|14|G|15|1|16]]|A|$]]|$1|H|3|I|5|6|7|17|8|@]|9|@$F|18|G|19|1|1A]]|A|$]]|$1|J|3|K|5|6|7|1B|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1C|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1D|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1E|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|Y]]|Z|$5|U|V|W|A|$X|10]]]]

Well, I know its an old thread but still i'm posting my answer because its still unanswered.

I know its against youtube policy to download video but there is a way of downloading youtube video as an audio/mp3 file.

First is: <a href="http://api.youtube6download.top" rel="noreferrer">http://api.youtube6download.top</a>
These guys will give you an easiest way of converting yt to mp3 by using there HTML LINK, Javascript/iframe widgets.

I have also seen their API listed on mashape
link: <a href="https://market.mashape.com/CoolGuruji/youtube-to-mp3-download" rel="noreferrer">https://market.mashape.com/CoolGuruji/youtube-to-mp3-download</a>

All you need to enter youtube video id and it will fetch/convert youtube video into audio format.

Its not official an API by youtube itself.

I am using it on my websites it works very well for me.

I hope now this question is actually answered.

blocks|key|964734|text|使用YouTube+MP3+API。iframe代码生成不同质量的下载按钮，它是免费的，没有广告。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|964735|https://youtubemp3api.com/|offset|length|964736|还请看这个Github链接：YouTube-MP3-API+@+GitHub|964737|entityMap|0|LINK|mutability|MUTABLE|url|1|https://github.com/Dalero/YouTube-MP3-API^0|0|0|Q|0|0|E|O|1|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@$D|S|E|T|1|U]]|A|$]]|$1|F|3|G|5|6|7|V|8|@]|9|@$D|W|E|X|1|Y]]|A|$]]|$1|H|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|C]]|O|$5|K|L|M|A|$N|P]]]]

Use the YouTube MP3 API. The iframe Code generates Download Buttons in various qualities and it´s free and without Ads.

<a href="https://youtubemp3api.com/" rel="nofollow noreferrer">https://youtubemp3api.com/</a>

Look also at this Github Link:
<a href="https://github.com/Dalero/YouTube-MP3-API" rel="nofollow noreferrer">YouTube-MP3-API @ GitHub</a>

blocks|key|936885|text|我开发了YouTuber小软件来从YouTube中提取mp3。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|936886|您可以克隆源代码https://github.com/maythamfahmi/YouTuber。|offset|length|936887|或者，只需在windows+https://github.com/maythamfahmi/YouTuber/releases的(cmd)命令行中使用发布版本。|936888|免责声明:新增的github是我的个人回购|blockquote|936889|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/maythamfahmi/YouTuber|1|https://github.com/maythamfahmi/YouTuber/releases^0|0|8|14|0|0|E|1D|1|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@$D|W|E|X|1|Y]]|A|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@$D|10|E|11|1|12]]|A|$]]|$1|H|3|I|5|J|7|13|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]|S|$5|N|O|P|A|$Q|T]]]]

I have developed YouTuber little software to extract mp3 from YouTube.

You can clone source code <a href="https://github.com/maythamfahmi/YouTuber" rel="nofollow noreferrer">https://github.com/maythamfahmi/YouTuber</a>

Or just use the release version in (cmd) command line for windows <a href="https://github.com/maythamfahmi/YouTuber/releases" rel="nofollow noreferrer">https://github.com/maythamfahmi/YouTuber/releases</a>.

<blockquote>
 disclaimer: the added github is to my personal repo
</blockquote>

blocks|key|2200500|text|youtube-dl|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2200501|这在技术上是可能的，而且很容易用youtube-dl实现。注意:这不是一个"api“。这不是谷歌所支持的，从技术上讲，这可能是反对TOS的。我想如果你能进入朝鲜，那就是完全合法的。|BOLD|2200502|#+Download+the+stream+and+extract+the+audio.
youtube-dl+-x

#+If+you+just+need+the+url+you+can+use
youtube-dl+-x+--get-url+<URL>|code-block|syntax|javascript|2200503|entityMap|0|LINK|mutability|MUTABLE|url|https://rg3.github.io/youtube-dl/^0|0|A|0|G|A|2C|5|G|A|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Y|8|@$9|Z|A|10|B|C]|$9|11|A|12|B|H]]|D|@$9|13|A|14|1|15]]|E|$]]|$1|I|3|J|5|K|7|16|8|@]|D|@]|E|$L|M]]|$1|N|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|O|$P|$5|Q|R|S|E|$T|U]]]]

<h1><code>youtube-dl</code></h1>

This is technically possible and very easy to do with <a href="https://rg3.github.io/youtube-dl/" rel="noreferrer"><code>youtube-dl</code></a>. Note: this isn't an "api". This isn't supported by Google, and it technically may be against there TOS. I assume if you have access in North Korea, that it's totally legal.

<pre><code># Download the stream and extract the audio.
youtube-dl -x

# If you just need the url you can use
youtube-dl -x --get-url &lt;URL&gt;
</code></pre>

blocks|key|2200536|text|使用loadercdn，您可以申请自己的API进行下载。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2200537|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

using loadercdn you can apply for your own API to do the download.

blocks|key|939621|text|更新，因为我认为没有人认为这有那么容易。只要读一读，如果你想用它作为私人使用(你知道，youtube的术语和类似的东西)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|939622|在对不同的API和库进行了一些研究并研究了源代码之后，我自己和wolla尝试了一下。|939623|仅仅是说，音频只链接在每个视频的页面源中。|939624|你只需要知道你在寻找什么;)|939625|打开youtube视频，查看页面来源并搜索“mime%253+D音频”。应该有5个匹配，例如完整的url：|939626|"https%253A%252F%252Fr2---sn-35cxanpbo5a-8pxl.googlevideo.com%252Fvideoplayback%253Fsource%253Dyoutube%2526signature%253D30EC556F55533FBFD9003767730D10556681F33A.B12E021CA54CCB9E225F58A4430E9BB528081FB5%2526requiressl%253Dyes%2526expire%253D1527306011%2526clen%253D3064602%2526initcwndbps%253D1152500%2526ipbits%253D0%2526mime%253Daudio%25252Fmp4%2526dur%253D192.911%2526fvip%253D5%2526lmt%253D1524946334873350%2526key%253Dyt6%2526sparams%253Dclen%25252Cdur%25252Cei%25252Cgir%25252Cid%25252Cinitcwndbps%25252Cip%25252Cipbits%25252Citag%25252Ckeepalive%25252Clmt%25252Cmime%25252Cmm%25252Cmn%25252Cms%25252Cmv%25252Cpl%25252Crequiressl%25252Csource%25252Cexpire%2526itag%253D140%2526gir%253Dyes%2526ip%253D81.217.53.239%2526id%253Do-ALNxMeQYw4LLc1FAjxt4h795wKTdqJnzc_SBgzEJVBxR%2526c%253DWEB%2526keepalive%253Dyes%2526mm%253D31%25252C29%2526mn%253Dsn-35cxanpbo5a-8pxl%25252Csn-2gb7sn7r%2526ei%253Du4IIW7DfC46rgAfrrpnICw%2526ms%253Dau%25252Crdu%2526mt%253D1527284230%2526pl%253D16%2526mv%253Dm“|939627|只要解码URL你就能得到你想要的。|939628|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|S|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|T|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|U|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|V|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|O|$]]

Update, because I think no one thought it what that easy. Just read it, if you want to use it for private usage (you know, youtube terms and stuff like that).

After some research work with different APIs and libraries and researching source code, I just tried it by myself and wolla.

Just saying, audio only links are in the page source of each video.

You just have to know what you are looking for ;)

Open a youtube video, view page source and search for "mime%3Daudio". There should be 5 matches, full url for example:

"https%3A%2F%2Fr2---sn-35cxanpbo5a-8pxl.googlevideo.com%2Fvideoplayback%3Fsource%3Dyoutube%26signature%3D30EC556F55533FBFD9003767730D10556681F33A.B12E021CA54CCB9E225F58A4430E9BB528081FB5%26requiressl%3Dyes%26expire%3D1527306011%26clen%3D3064602%26initcwndbps%3D1152500%26ipbits%3D0%26mime%3Daudio%252Fmp4%26dur%3D192.911%26fvip%3D5%26lmt%3D1524946334873350%26key%3Dyt6%26sparams%3Dclen%252Cdur%252Cei%252Cgir%252Cid%252Cinitcwndbps%252Cip%252Cipbits%252Citag%252Ckeepalive%252Clmt%252Cmime%252Cmm%252Cmn%252Cms%252Cmv%252Cpl%252Crequiressl%252Csource%252Cexpire%26itag%3D140%26gir%3Dyes%26ip%3D81.217.53.239%26id%3Do-ALNxMeQYw4LLc1FAjxt4h795wKTdqJnzc_SBgzEJVBxR%26c%3DWEB%26keepalive%3Dyes%26mm%3D31%252C29%26mn%3Dsn-35cxanpbo5a-8pxl%252Csn-2gb7sn7r%26ei%3Du4IIW7DfC46rgAfrrpnICw%26ms%3Dau%252Crdu%26mt%3D1527284230%26pl%3D16%26mv%3Dm"

Just decode URL and you got what you want.

I've searched for this question several times

Many suggested that 'Get both audio and video. And hide video.' and said that 'there is no audio only API'

But it needs more traffic than when only audio is retrieved if I wanted to listen to music via Youtube.

What makes me confused is, an android app called Firetube provides audio only.

Is this just a trick or does Google provides AUDIO ONLY API?

Is there a Youtube API that gives only audio?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我找过这个问题好几次了许多人建议，“同时获取音频和视频，并隐藏视频”。并说‘没有音频只有API’但是如果我想通过Youtube听音乐的话，它需要更多的流量。让我困惑的是，一款名为Firetube的android应用程序只提供音频。这仅仅是一个小把戏，还是Google只提供了音频API？

问有只提供音频的Youtube API吗？
EN

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问有只提供音频的Youtube API吗？EN