IIRC (I did this in 2018-19), the image updates at ~58 frames per second. There were numerous difficulties in making video of these. The LEDs' duty cycles are

IIRC (I did this in 2018-19), the image updates at ~58 frames per second. There were numerous difficulties in making video of these. The LEDs' duty cycles are actually very short. HUB75 lights at most one row in 32 at any given instant. I shot all my video on an iPhone. The iPhone does who-knows-what processing to its video. It apparently does not scan top-to-bottom, but in bands, and it dynamically changes exposure times based on unknown heuristics. Here are some fails for your amusement. https://imgur.com/a/csSytw2 https://imgur.com/a/csSytw2 Recent gateware changes have increased the LED refresh rate to ~280 Hz, and that has changed and generally reduced video artifacts, but has not eliminated them. I can't tell you exactly what happened on the still you posted.