I came across this post on Gab, with this picture
The Nashville shooter's shoes changed.
I decided to check the video myself. On this school surveillance video, at 1:32, you can clearly see the shooter wearing one type of shoes. On this police bodycam footage video, at 5:57, the shooter is clearly wearing a different pair of shoes.
Possible false flag.
Someone else posted this higher res video with both the school surveillance footage, and the bodycam footage. The relevant time stamps are at 1:07 and 8:14.
If the school surveillance video is crappy and artifacting/blending the colors of the yellow flame and white line of the shoe, then why doesn't the camera do the same thing to the camo pants, or to the carpet, which has much finer detailing? Look at the paper just to the right of the printer at 1:07, which has fine detailed markings in clearly different colors. If it can show that, it shouldn't mess up the shoes that badly.
Digital camera artifacting is due to the lack of resolution of the camera, where a color "block" (pixel) of one area gets blended with another. However, we can obviously see that much finer detail exists in the surveillance video, specifically with the carpet and the paper to the right of the printer. That camera should've been able to show the clear delineation of colors on the shoes.