I also noticed that when shooting the darker area of the footage had like TV flicker line running up and down it. Maybe because the lighting was low ? or there was something in the way ?
Through doing research I found out that :
"In fact, you see the "light's refresh rate", specially with old fluorescent lights (fluorescent lights or with sodium lights in industrial environment for ex.) so you see the light in its "OFF phase" and sometimes in its "ON phase".
Over 100 Hz, the "camera capturing time" is too short to see the light always ON, like our eyes.
If you use cine specialized HMI lights, or incandescent lights, you can work with higher shutters."
It's basically telling us the type of light used within the building was causing it to flicker, if the lights were more recent such a thing would not be present.
Information taken from :
http://www.dvinfo.net/forum/canon-eos-7d-hd/474495-flicker-7d-50hz-country-shutter-speeds.html
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