Eirudo

<p>Embed YouTube videos and keept their aspect ratio, just using simple shortcode.</p>
<ul>
<li>Simple shortcode, can be used in the posts or widgets.</li>
<li>Using default YouTube Embed Code (iframe), but make it responsive</li>
<li>Custom aspect ratio, if you want set different porpotion size.</li>
<li>Auto centered position. So if you insert it on your post section, the video always on center-aligned.</li>
<li>Lazy Load supported.</li>
<li>100% Free! And no ads or even trackers inside.</li>
</ul>
<h3>Arbitrary section</h3>
<h3>A brief Markdown Example</h3>
<p>Pros:<br />
1. Simple, only using shortcode to use for individual video each shortcode<br />
2. Lazy Load supported<br />
3. Custom parameters for advanced use</p>
<p>Cons:<br />
1. Only for simple use,not for advanced playlist. Embedding one video for each shortcode.</p>


Simple YouTube Responsive

Perfect

You can add a line to your functions.php to make videos responsive if you're doing your own theme. However, if you're not, this plugin works beautifully and gives other options like lazy load, etc. 

If doing your own theme, add: add_theme_support( 'responsive-embeds' );

Works Beautifully

Embed responsive YouTube videos using simple shortcode. Lazy Load supported.

Fens Liu

<p>Smartideo 是为 WordPress 添加对在线视频支持的一款插件（支持手机、平板等设备HTML5播放）。 目前支持YouTube、哔哩哔哩、腾讯视频、优酷、搜狐视频、56、华数等网站。</p>
<p>直接粘贴视频播放页完整的URL到编辑器（单独一行），就可以加载视频播放器。</p>
<h4>详细介绍</h4>
<p>https://7yper.com/3639</p>


Smartideo

Smartideo 是为 WordPress 添加对在线视频支持的一款插件（支持手机、平板等设备HTML5播放）。

Simple YouTube Responsive vs Smartideo