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EDIT: MY problem turned out to be corrupt files on my unraid server due to a bad RAM chip on the server.

I have ~100 movies in x264 mkv with file sizes between 8-15GB. All of them display the grayish pixelation. They'll be ok for 5-15 minutes and then as scenes change they'll receive the pixelation. Sometimes it lasts for only a second or two, other times it'll compound until the screen is covered with it. Once a scene changes it'll often clear the gray out.

I've tried Windows Media Player 12, VLC, and xbmc. I've also tried Windows 8.1 and ubuntu 12 (vlc, xbmc). I've tried two machines. I've tried playing them off of my file server, as well as copying them locally.

At the least, does anyone know what this type of pixelation is called? I've spent hours trying to find out, but it's hard to search for.

Machine1:
Windows 8.1
i7 930 @ 2.8GHz
GTX 480 SLI (x2)
12 GB ram

Machine 2:
Win8 and also tried ubuntu 12.10
i3 4130T haswell 2.9GHz
integrated intel 4400 graphics
4 GB ram

http://www.youtube.com/watch?v=_5lKgm9XDiU

enter image description here

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  • I updated machine1 to the latest nvidia drivers as of today. I tried machine2 but ubuntu 12.10 wouldn't accept the latest intel driver due to a libglib2.0 requirement. Mar 22, 2014 at 6:04

1 Answer 1

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The gray pixelation in your videoclip shows an example of visual artifacts. A compression artifact is a noticeable distortion of media caused by the application of lossy data compression. If the compressor could not reproduce enough data in the compressed version to reproduce the original, the result is a diminishing of quality or introduction of artifacts.1

For additional information about fixing visual artifacts problems search for questions that have the visual-artifacts tag here at Superuser Q&A.

1https://en.wikipedia.org/wiki/Compression_artifacts

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  • Thanks. It turned out that all of my files were getting corrupt during the transfer to my fileserver, so the artifacts were generated due to corrupt files. Though, you did effectively answer my relatively vague question. Thanks for that :) Mar 22, 2014 at 15:27

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