alvaron

Create a dynamic gallery multiple widget(works as shortcode too), with thumbnails of each post with youtube/vimeo(beta) videos displayed on the content linked to the post single. Checks all you video posts, but you can filter them by category and choose the number of posts.
Based on
Media Library Gallery 1.0.2 (http://www.cybwarrior.com/media-library-gallery/) by Raphael Verchere(http://www.cybwarrior.com)
Video Thumbnails 1.0.7(http://sutherlandboswell.com/2010/11/wordpress-video-thumbnails/) by Sutherland Boswell(http://sutherlandboswell.com)
and
Simple Video Embedder(http://www.press75.com/the-simple-video-embedder-wordpress-plugin/) by James Lao(http://jameslao.com/)
Special thanks to Felipe Caroé http://www.felipecaroe.com/ for suggesting the name!
<h3>Arbitrary section</h3>
This Plugin supports YouTube and Vimeo(beta) 
If you decide to use iframe and embed object, please use the html code insert on the post 
The plugin works better when urls are pasted on the post editor
This readme file were validated at https://wordpress.org/extend/plugins/about/validator/

YouTubeNails

Create a dynamic gallery multiple widget(works as shortcode too), with thumbnails of each post with youtube/vimeo(beta) videos displayed on the conten …

nosilver4u

Pedro Elsner

Force Regenerate Thumbnails allows you to delete all old images sizes and REALLY regenerate the thumbnails for your uploads.
Regenerate all thumbnails from the Tools admin menu. Regenerate batches of images via the Media Library list mode. Select the images to regenerate and then use the Bulk Actions drop-down menu to Force Regenerate Thumbnails. Use attachment actions to regenerate thumbnails for a single image.
Several filters exist for advanced usage. See more via <a href="https://gist.github.com/nosilver4u/eb858df10521aece2044a3a15ccdd17b" rel="nofollow ugc">this gist</a>.
You may report security issues through our Patchstack Vulnerability Disclosure Program. The Patchstack team helps validate, triage and handle any security vulnerabilities. <a href="https://patchstack.com/database/vdp/force-regenerate-thumbnails" rel="nofollow ugc">Report a security vulnerability.</a>

Force Regenerate Thumbnails

Delete and REALLY force thumbnail regeneration.

YouTubeNails vs Force Regenerate Thumbnails