Seeing as only gifs play on the thumbnail level, there's nothing to show a buyer or anyone investigating NFTs in a collection or the front page that they are in fact movies.
A discreet, yet noticeable semi transparent icon over the movie thumbnails would show that they are in fact, a movie.
In the attached example, it would be possible to see that the right hand image is a movie, rather than assume it is static.
OK, I've been trying to figure out when the preview image for .mp4 does load. At first I thought it was maybe tied to file size or length of video. I pulled five different .mp4s from my collection that all have videos displaying within the gridview/preview.
Even if we had some kind of guidelines as to why these got a preview and other don't would be useful. I thought it might be tied to file size or length of the .mp4 but if that were the case then this piece by Measureless linked below would have met those guidelines. It is strange and baffling and would love some clarity.
I second that, or at least a bigger GIF size allowance, since having to compress them down to 2mb always results in terrible quality.