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As you can see -->here<--, full support for 4k/UHD h.264 DXVA was added for UVD v5 and R9 285 cards. Your HD 7800 series card is older. It "only" supports UVD v3 and HD h.264 DXVA. There's no support for 4k/UHD h.264 DXVA. So, your CPU must be used to decode these videos.

The screenshot shows that the CPU is running at 25%. Since it's a quad core CPU, that means one core is probably running at or close to 100% => overloaded.

In summary: your AMD GPU does not support 4k/UHD h.264 DXVA, and your CPU isn't powerful enough to decode it either.

However... I think the GPU included with your CPU may be able to do it.
i3-4150 has Haswell 4400 graphics.
Intel's Haswell - An HTPC Perspective: Media Playback, 4K and QuickSync Evaluated

Side note...
[USER=140174]@Stéphane Lenclud[/USER]
MP 1.15, repeated exceptions in SharpLib.Hid. One per second:
[collapse]
[2017-03-27 17:33:20,042] [Error ] [MPMain ] [ERROR] - InputDevices - WndProc - exception caught from InputDevice: MediaPortal.InputDevices.HidListener System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
 at SharpLib.Hid.Event.GetDirectionPadState()
 at SharpLib.Hid.Event..ctor(Message aMessage, HidEventRepeatDelegate aRepeatDelegate, Boolean aRepeat, Int32 aRepeatDelayInMs, Int32 aRepeatSpeedInMs)
 at SharpLib.Hid.Handler.ProcessInput(Message& aMessage)
 at MediaPortal.InputDevices.HidListener.WndProc(Message& msg, Action& action, Char& key, Keys& keyCode)
 at MediaPortal.InputDevices.InputDevices.WndProc(Message& msg, Action& action, Char& key, Keys& keyCode)[/collapse]

<blockquote data-quote="mm1352000" data-source="post: 1216399" data-attributes="member: 82144">As you can see --&gt;<a href="https://en.wikipedia.org/wiki/Unified_Video_Decoder#UVD_5" target="_blank">here</a>&lt;--, full support for 4k/UHD h.264 DXVA was added for UVD v5 and R9 285 cards. Your HD 7800 series card is older. It &quot;only&quot; supports UVD v3 and HD h.264 DXVA. There's no support for 4k/UHD h.264 DXVA. So, your CPU must be used to decode these videos.The screenshot shows that the CPU is running at 25%. Since it's a quad core CPU, that means one core is probably running at or close to 100% =&gt; overloaded.In summary: your AMD GPU does not support 4k/UHD h.264 DXVA, and your CPU isn't powerful enough to decode it either.However... I think the GPU included with your CPU may be able to do it.i3-4150 has Haswell 4400 graphics.<a href="http://www.anandtech.com/show/7007/intels-haswell-an-htpc-perspective/7" target="_blank">Intel's Haswell - An HTPC Perspective: Media Playback, 4K and QuickSync Evaluated</a>Side note...[USER=140174]@Stéphane Lenclud[/USER]MP 1.15, repeated exceptions in SharpLib.Hid. One per second:[collapse][2017-03-27 17:33:20,042] [Error&nbsp; ] [MPMain&nbsp;&nbsp; ] [ERROR] - InputDevices - WndProc - exception caught from InputDevice: MediaPortal.InputDevices.HidListener System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.&nbsp;&nbsp; at SharpLib.Hid.Event.GetDirectionPadState()&nbsp;&nbsp; at SharpLib.Hid.Event..ctor(Message aMessage, HidEventRepeatDelegate aRepeatDelegate, Boolean aRepeat, Int32 aRepeatDelayInMs, Int32 aRepeatSpeedInMs)&nbsp;&nbsp; at SharpLib.Hid.Handler.ProcessInput(Message&amp; aMessage)&nbsp;&nbsp; at MediaPortal.InputDevices.HidListener.WndProc(Message&amp; msg, Action&amp; action, Char&amp; key, Keys&amp; keyCode)&nbsp;&nbsp; at MediaPortal.InputDevices.InputDevices.WndProc(Message&amp; msg, Action&amp; action, Char&amp; key, Keys&amp; keyCode)[/collapse]</blockquote>

[QUOTE="mm1352000, post: 1216399, member: 82144"] As you can see -->[URL='https://en.wikipedia.org/wiki/Unified_Video_Decoder#UVD_5']here[/URL]<--, full support for 4k/UHD h.264 DXVA was added for UVD v5 and R9 285 cards. Your HD 7800 series card is older. It "only" supports UVD v3 and HD h.264 DXVA. There's no support for 4k/UHD h.264 DXVA. So, your CPU must be used to decode these videos. The screenshot shows that the CPU is running at 25%. Since it's a quad core CPU, that means one core is probably running at or close to 100% => overloaded. In summary: your AMD GPU does not support 4k/UHD h.264 DXVA, and your CPU isn't powerful enough to decode it either. [B]However...[/B] I [I]think [/I]the GPU included with your CPU may be able to do it. i3-4150 has Haswell 4400 graphics. [URL="http://www.anandtech.com/show/7007/intels-haswell-an-htpc-perspective/7"]Intel's Haswell - An HTPC Perspective: Media Playback, 4K and QuickSync Evaluated[/URL] Side note... [USER=140174]@Stéphane Lenclud[/USER] MP 1.15, repeated exceptions in SharpLib.Hid. One per second: [collapse] [2017-03-27 17:33:20,042] [Error ] [MPMain ] [ERROR] - InputDevices - WndProc - exception caught from InputDevice: MediaPortal.InputDevices.HidListener System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary. at SharpLib.Hid.Event.GetDirectionPadState() at SharpLib.Hid.Event..ctor(Message aMessage, HidEventRepeatDelegate aRepeatDelegate, Boolean aRepeat, Int32 aRepeatDelayInMs, Int32 aRepeatSpeedInMs) at SharpLib.Hid.Handler.ProcessInput(Message& aMessage) at MediaPortal.InputDevices.HidListener.WndProc(Message& msg, Action& action, Char& key, Keys& keyCode) at MediaPortal.InputDevices.InputDevices.WndProc(Message& msg, Action& action, Char& key, Keys& keyCode)[/collapse] [/QUOTE]