Pixellation is due to dropout. The signal is either there or it is not. If it is not there you get a black square in your video stream.
If that particular vireo segment was supposed to have a blue eye in it, it either had a blue eye or nothing. Not a green eye. Not a brown eye. Not an ear or a bird, and if there was a blue eye it was distinct, with no blurring or other distortion.
That is the nature of digital communication. There. Not there. Nothing in between. If the error detection/correction detects the lost segment and requests a resend - and gets it on time to pop it into the data train on time, there is no dropout. If not, you get the dropout - and most systems will only allow so many dropouts before they just blank.