@jono -- right click does it (even on a Mac which pretends to have only one button). It looks like it will take less than half an hour. Of course, if you have DSL from the national wireline telephone company, you can forget about upload speed. The file is already encoded densely so zipping shouldn't make it any smaller. Do you have something faster at your office, or can you pass the problem to one of your sons -- that's what they are for!
I've been tempted to try 4K video on the SL, after seeing the nice work David Farkas has been doing. But the extra gear he uses to get 10 bit, 4:2:2 externally recorded video with good live miked sound and use a graded (reduced contrast) profile that has to be undone before you can see what you shot is a bit daunting. A pretty expensive experiment if you are just playing around. So my video button is still programmed OFF, waiting for a subject that will require it. The closest I can think of to your starlings is men in black and white, dancing frenetically at an ultra-orthodox wedding. Still images leave a lot out. I'll have more chances for that. Might try it with an E-M5.2, which has only HD (1900x1200) but also very good stabilization.
scott