El Capitan - Video Issues (iMovie/Quicktime)

[tdbrown75]

I have a BTO Late 2015 iMac Retina 5K with the following specs:
OS X El Capitan 10.11.2
3.3 GHz Intel Core i5
24 GB 1867 MHz DDR3
AMD Radeon R9 M395X 4096 MB
512GB SSD

I have had the machine for about two months and have had zero issues, until today. It's the first time I pulled up iMovie to do some video editing. Both newly imported video as well as old footage in my libraries appear pixelated on the right side. Same thing happens when I try and play the AVCHD files in Quicktime.

The very same files on a 2011 Mac Mini, with the same versions of OSx and iMovie, work just fine. So I believe the issue is isolated to my iMac.

I have the issue showing up on multiple files, from multiple Sony cameras and my iPhone. Although the iPhone video only appears pixelated in the preview screen. AVCHD files appear pixelated in both the preview and the main window. SD movies (both old and new) seem fine.

I removed my added memory, ran hardware diagnostics (no issues), formatted and reinstalled OSx (same issue) and have been trolling the net for similar problems, but can't find anything like it.

I finally broke down and called Apple support, and spoke to 3 different people before submitting detailed diagnostics and screenshots to engineering. I was just curious if anyone else has had any similar issues?

Tim

 

[tdbrown75]

Coming back with an update, hopefully someone else might benefit from this post in the future.

After engineering reviewed the detailed diagnostics and screenshots, they determined the problem was a hardware problem related to the video card. I took the machine into Apple for a logic board replacement (video card / memory are integrated).

I picked the machine up Saturday, and the issue is in fact resolved. No more pixelation!

Tim