Eirudo

<p>A lightweight plugin to embed YouTube videos while keeping the correct aspect ratio — all with a simple shortcode.</p>
<ul>
<li>Very simple shortcode. Use it in posts or widgets.</li>
<li>Uses the default YouTube iframe embed, but fully responsive.</li>
<li>Custom aspect ratio if you want a different video size.</li>
<li>Automatically centered, so your video always looks neat in your content.</li>
<li>Lazy load support to improve performance.</li>
<li>100% free — no ads, no trackers, no funny business.</li>
</ul>
<h3>Arbitrary section</h3>
<h3>A brief Markdown Example</h3>
<p>Pros:<br />
1. Simple and lightweight — one shortcode per video<br />
2. Lazy load support<br />
3. Extra parameters available for advanced users</p>
<p>Cons:<br />
1. Designed for simple embeds only (no playlist support, one video per 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

Easily embed responsive YouTube videos using a simple shortcode. Lazy load included.

mhawksey

<p><a href="http://www.rsc-ne-scotland.org.uk/mashe/utitle/" rel="nofollow ugc">uTitle</a> is an experimental tool which uses Twitter to allow users to make free and timeline based comments on YouTube videos. The original concept is <a href="http://www.rsc-ne-scotland.org.uk/mashe/2010/06/convergence-youtube-meets-twitter-in-timeline-commenting-of-youtube-videos-using-twitter-utitle/" rel="nofollow ugc">explained in detail in this blog post</a>, but the basic idea is video are played in custom interface which lets users ‘tweet’ comments. Part of each tweet includes a hashtag linking it to a specific YouTube video and a timestamp from the current point in the video. Tweets are stored in the <a href="http://twapperkeeper.com/" rel="nofollow ugc">TwapperKeepr</a> and temporarily cached on the uTitle site. When a video is replayed in the uTitle interface existing comments appear at the timed points as subtitles and users can also use the timed tweets to jump to part of the video <a href="http://www.youtube.com/watch?v=RVp2F6tDWfw" rel="nofollow ugc">(see this video for a demonstration)</a></p>
<p>This plugin allows you to easily embed commented YouTube videos by enabling a uTitle specific short code (e.g. [utitle mode=1 comment=yes]RVp2F6tDWfw[/utitle]). Options are available to choose the type of player (see Screenshots) and as well as a choice to provide a link to invite users to add their own comments.</p>
<p>uTitle essentially works as the glue combining YouTube and Twitter, subsequently there is no direct control over moderating comments (but it does via TwapperKeepers configuration conform to Twitter’s deletion policy).</p>
<p>This plugin and the uTitle site are not affiliated with YouTube or Twitter.</p>


uTitle Plugin

The uTitle Plugin  allows timeline commenting of YouTube videos using Twitter by integrating with the experimental uTitle tool

Simple YouTube Responsive vs uTitle Plugin