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It might be ok actually... I just switched vcodec again, to mpeg4 this time, qscale:v 1, and and it is a 3 minute job for 40mb vid that looks ok on monitor.
I think the libx264 codec is (was) the problem.
Again bread & butter stuff no doubt for those more experienced, useful learning (and research) here.
Slightly sad I can't justify getting a Pi4 for this now though...
I've reached the conclusion the Pi Zero isn't upto this. I had 300 images from a failed attempt earlier (no tweet = no delete) and just ran the ffmpeg on the pi400. With the crf set at 1 for high quality it took just 30s to make the movie from the stills.
I'll upgrade to a pi4 and use the zero for youtube streaming as it seems ok at that.