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I found an update on the youtube page.

Update: A lot of people have asked about her now. I never thought it would get so much interest. This video is a chronicle of our time together, which I finished making a while ago. Subsequent to making the video, I had to travel a lot, and struggled with keeping her where I was living. A saviour stepped in and helped look after Pegs while I tried to make a plan and she moved back and forth, which was disruptive for her. After months of no solution, it was obvious that her new set up with incredible love, a bigger garden and a new best friend in Luna, another great dane was more than I could offer. I am lucky that I get to visit and take her for short periods, and maybe that's why in my heart she's still with me. It’s always difficult. If the dog is happier, do you forsake your happiness? I think yes. If a dog is negligently bred, should it be killed to prevent more negligent breeding? I think no. Who's to say. In the end we try our best and our pets teach us lessons about love, humility and non-judgment.

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My understanding is that the voltage being sent to the LED headlights is passed through a Pulse Width Modulation (PWM) driver that creates a pulsing effect so that the LED receives a consistent average voltage over time and allows for the control of the LED's perceived brightness. If there is a mismatch between the PWM frequency and the frame rate of the camera, you will see pulsing or flickering. You see the same kind of effect sometimes when a camera records a helicopter and the rotors appear to be stationary like here.

At least I'm pretty sure that's what's going on.