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jafletch, I appreciate the video preview thumbnails and full length video previews. Thanks!
On Tumblr, a user's Archive page ( username.tumblr.com/archive ) is one of the most useful ways to browse their content, however for synths shared there, currently nothing is shown beyond the fact that it is a Video post. (A default grey thumb is shown with a Play icon.) This isn't so helpful for distinguishing between posts if someone has shared multiple synths.
I'm not sure if Tumblr allows a GIF thumbnail for video posts, but even if you could get the beginning photo to show as a single thumbnail underneath the Play icon on the Archive page (as seen in posted Vimeo and YouTube videos there), it would be an improvement over the current situation.
For example, look at my archive from 2013 December: http://natelawrence.tumblr.com/archive/2013/12
We discovered this issue very close to our initial release and I did spend some time looking into it. Unfortunately, I never got to the bottom of where tumblr was fetching that image from so I was not able to provide it to them in time. We are aware of the issue though and hope to fix it in a future release.