jeroenooms

This WordPress plugin makes embedded media responsive.
To embed a video or another object into a WordPress post or page, place its URL into the content area. 
Make sure the URL is on its own line and not hyperlinked (clickable when viewing the post).
WordPress will automatically turn the URL into a YouTube embed and provide a live preview in the visual editor. 
Read more information about supported platforms and alternative implementations at <a href="https://codex.wordpress.org/Embeds" rel="nofollow ugc">WordPress.org</a>.
<h4>Supported platforms with this Responsive Media plugin</h4>
After installing this plugin, the following media will be responsive automaticly even on earlier published posts and pages. The version numbers show since when these oEmbedded media are supported by WordPress.
<ul>
<li>Flickr (2.9.0) [1]</li>
<li>Kickstarter (4.2.0)</li>
<li>Slideshare (3.5.0)</li>
<li>Soundcloud (3.5.0)</li>
<li>Speakerdeck (4.4.0)</li>
<li>TED Talks (4.0.0)</li>
<li>Videopress (4.4.0)</li>
<li>Vimeo (2.9.0)</li>
<li>Vine (4.1.0)</li>
<li>Youtube (2.9.0) [2]</li>
<li>WordPress.tv (2.9.0)</li>
</ul>
Responsive support without plugin:
<ul>
<li>Meetup (3.9.0)</li>
</ul>
[1] Flic.kr domain since 3.6.0 
[2] Youtu.be domain since 3.0.0, Youtube playlists since 4.0.0

Responsive Media

Wordpress plugin for responsive embedded media (oEmbed) like Youtube, Vimeo, Flickr, Kickstarter, Slideshare, Soundcloud, Speakerdeck, TED & Vine.

Ulrich

Standalone JavaScript for fluid YouTube/Vimeo iframe embeds. Add more video players and selectors easily in the media settings.
Description of the Fluidvids script 
“Fluidvids is a 1KB standalone module that provides a fluid solution for video embeds. Fluidvids has the ability for custom players to be added as well as support for dynamically injected (XHR/Ajax/createElement) videos.
Check out a <a href="http://toddmotto.com/labs/fluidvids" rel="nofollow ugc">demo of fluidvids</a>“
<h3>Credits</h3>
The plugin can also be found on <a href="https://github.com/grappler/fluidvids" rel="nofollow ugc">GitHub</a>.
<ul>
<li>Thank you <a href="http://toddmot.to/" rel="nofollow ugc">Todd Motto</a> for <a href="https://github.com/toddmotto/fluidvids" rel="nofollow ugc">fluidvids.js</a></li>
<li>Thank you <a href="http://tommcfarlin.com/" rel="nofollow ugc">Tom McFarlin</a> for the <a href="https://github.com/tommcfarlin/WordPress-Plugin-Boilerplate" rel="nofollow ugc">WordPress Plugin Boilerplate</a></li>
</ul>

Fluidvids for WordPress

Standalone JavaScript for fluid YouTube/Vimeo iframe embeds. Easily add additional video players and selectors in the settings.

Responsive Media vs Fluidvids for WordPress