Thanks for the replies.
I notice that other content has been uploaded correctly to gobblin.se so I
don't think it is a matter of "running out of space". Could it be something
related to the file type? I was using ogg.
Also, I have taken a look at your suggested alternatives elbendecido, but
those are "free software running social networks". Not "file sharing" or
"video uploading" websites.
Damn, I will try to use another mediagoblin instance but it really pisses me
off that they only screw the upload AFTER I spent hours uploading the file
(upload is really slow). Oh well...
Also, don't use anonfiles for ogg videos. I tried there too, and AFTER
(again) uploading the file, it said "file type not supported, please try
again". How about letting me know BEFORE? -.-"