Remember my last blog? All sounded like it was going so well.
That was until I realised the old NLE had decided to put a black frame around my uncompressed render. Why? After lots of messing around, it appears to have been a bug. It kept messing up pixel size, and even though I'd manually set it as 1.0, it still wouldn't work until (as I eventually fluked upon) you completely change export types, then change back. It then defaults to 1.0 and, you know, actually works.