I think the clap method is more than anyone could ask for
as long as the time index is accurate, should be good enough to piece it together.
FYI, speaking of video testing, just picked up a $200 seek xr (android), it is a little picky about android models (needs OTG with power, 4.3+), works on the kids onetouch out of the box but not my xperia z1s without adding power.
went with it over the flir because it has a much wider temperature range.