Yes, we feel your pain. When your clients see nothing after uploading a video, they waste more time attempting to do it again. And again.

I found that my hosting service was limiting my i/o. And that I had many processes that were never completed in a folder somewhere on the server.

Good luck! Because if your social site does not have video - it has nothing. 

Funny that even an old cell-phone can process video and send and receive it without a long delay...