It is currently possible to designate the thumbnail of a video used on WIkipedia by specifying a time using the thumbtime parameter, but this must be done individually for every time the video is used. It would be better to have the ability to set a default thumbnail time on Commons that would appear for every use of the file unless overriden by a parameter like thumbtime.
Description
Description
Event Timeline
Comment Actions
This could be extended to all presentations of video thumbnails. See also https://commons.wikimedia.org/wiki/Commons:Help_desk#Changing_default_thumbnail_for_a_video.
Comment Actions
+1. this would help a lot to convince partners to directly contribute video files to the commons.