I was talking with an engineer and he explained that he'd wondered how I'd replaced the candles in the video to make it look like a consistent burn with no time gaps. Extraordinary!
The answer is that it was done in one 'take' - no gaps or pauses in the shooting of the video so the candles were genuinely burning all in one consistent period.
I guess this is the sort of forensic evaluation that I should be used to after a TV diet of CSI and similar!
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