Jagged / Pixelated Highlights on High Contrast Shot - Help

[vandignal]

I've only encountered this problem once, when shooting sparks coming off a metal saw. The edges of the sparks look jagged/pixelated.
I'm curious if this has anything to do with Magic Lantern or the 5d3 sensor. I can't seem to find any similar problem on the forum.

I was shooting 60p RAW video 1920x504 on a 5dm3.

Link to sample dng: https://www.dropbox.com/s/kk6uaoqom2a4k7z/ML_Metal_Workshop_Day_1_041_C0000_00011.dng?dl=0

Would really appreciate it if someone could explain why this happens.

Thanks! 

[dmilligan]

Would really appreciate it if someone could explain why this happens.

It happens when you sample below the Nyquist limit. Further reading: http://en.wikipedia.org/wiki/Aliasing

[vandignal]

Thanks! Interesting article.
I thought the 5d3 didn't experience much aliasing, but I guess this is a pretty extreme situation.

[dmilligan]

It doesn't in regular 1080p mode, because it does pixel binning, but this is the 50/60p squashed mode, and I think it probably still has to do some line skipping.