In the "manage display" form of a content type using a video embed field, we can use "Thumbnail" as a formatter.
Then, we can select an image style to display the thumbnail of the video.
Unfortunately, it is not possible to select a Responsive image styles (included in core)
Closed: won't fix
2.0
Video Embed Field (base module)
Not all content is available!
It's likely this issue predates Contrib.social: some issue and comment data are missing.
Re-rolled patch https://www.drupal.org/project/video_embed_field/issues/2905584#comment-... ✨ Thumbnail Formatter should be allowed to use core Responsive image styles Closed: won't fix for 3.x branch.
@rahulrasgon I would rather create a new "Responsive thumbnail" formatter, what do you think?