TIP: mp4 videos over 1.5 GB should be re-encoded. Frees up some space and some encoders don't know how to properly encode an mp4 file. It doesn't have be 3GB for top notch quality.
It is okay, because most of the uploaded content has over 2-5 mbit bitrate and get imported 1:1 without re-encoding it. We have enough of traffic to push it.