Even with very small files -- it seems to finish uploading, then finally concludes "File received. Adding to IPFS Datastore..." and then fails.
UPDATE: After MANY attempts I was able to get a single file (61MB) up: https://dtube.video/#!/v/iceagefarmer/jh9ezx39
Was 61MB the smallest file you tried?
I get exactly the same thing as you did...on everything I tried.
No I've had intermittent success; early on I think I managed to get a 1gb+ file up, but I could be wrong. But definitely getting ~200-300mb videos on INTERMITTENTLY now once again. A progress bar was just added during upload, which is visually nice, even if it hasn't seemed to fix the IPFS issue.
This has driven me sufficiently crazy to install a local IPFS gateway and play with it; an alternative might be to achieve the upload OUTSIDE the dtube UI, then provide a reference to it. But I'm sure that would just make for even more opportunities for breakage (and delivering weird content to media players).
What fun problems to solve.