I keep getting the following error when I try to upload a video:

Code:
ERROR: Unable to execute query

update video set
			flvdoname='12080586181700952479.flv',
			duration='261.982' WHERE VID=71

MySQL server has gone away
I've tried everything but nothing works. What could possibly be wrong. When I upload smaller videos they work but when I upload large videos like this one I get the above error.

I need help A.S.A.P