Ok, had a lot of trouble getting large videos to upload. Finally got the settings right (after going against what HFW was telling me) to allow large uploads.
I then uploaded a 75 mb video file, the upload completed, then went to processing where it sat for a while, then I went back to find the video in the 'upload failed' category.(H.264 is not enabled)
Did this twice, got frustrated and went to bed.
Came back the following morning and both videos that had 'failed' were now available on the site. Can someone explain?