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I have just tried some other images and they worked!
The images that do NOT work are actually in ARGB format so instead of each pixel taking up 24 bits, these are 32 bit pixels so that may be the problem?
So the bitmap file is 1024 X 577 and total file size of 2,363,446
1024 X 577 X 4 = 2,363,392 with a header of 54 as per usual.
Update
Some of the 32 bit pixel files work so back to square one
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Right!
I think I have (maybe) solved this problem
The images that don't turn into a video file are of different sizes (because I have run them through a program I am writing that rotates them and does stuff)
Once I made them all the same size it worked so that may well be the problem ... maybe tell your programmers so if that is the problem they can tell people as the images are input (or just reprocess them to the same size)
UPDATE
Have tried a lot of examples and am almost certain that importing different sized images screws up the Video export ...