I've bought S4 yesterday.
Everything works great except recorded video or Youtube video starts to flicker/artifacts, green lines appears and eventually the video stops.
I've tried installing Nexus camera but that didn't work either.
Also when i play videos that are from my PC it works normally, no flicker or artifacts appears.
Tested for dead pixels but there is none:
Increased brightness to the max Installed a free app called Dead Pixel Test by UJACHA from Google Play Cycled through the colors and inspected the screen.
Here's the screenshots when playing youtube:
Dummy recording is here
Should i return the cell and demand a new one?