I know that in vine the first thing you saw from a vid was the first image of the vid, the start of the video. Which is very common to see but it would be nice to have an option for a screenshot, custome image, or thumbnail to be posted along with the description of the video. This could allow some users to customize the video with a app image for comedy or drama or music, just as an example. Allowing for more freedom of customization to a person’s video would go a long way to keeping the artists interested and vested in the work they’re allowed to post.
I did do a few searches for this, and it may already exist, if so please move or delete this.