gnirtS
First Officer
Flight distance : 5712575 ft
Cayman Islands
Offline
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Its due to the fairly severe compression used on the codec combined with the low 60mbps bit rate the 4k uses. Basically the codec starts a new "sequence" frame, then for the next 7 uses a difference model to compress. Then on the 8th frame it starts a new clear frame and does it again.
The result is regular pulsing brightness differences on video.
The only solution is to use something like Neat Video to remove it or shoot in 2.7k.
(Assuming you are using manual exposure for video not auto. Auto can cause changes as well).
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