User Agent

AppleCoreMedia/1.0.0.17K449 (Apple TV; U; CPU OS 13_3 like Mac OS X; en_us)\x5Cx5Cx22

This user agent belongs to AppleCoreMedia. Apple Inc developed this Application. This Application run on ATV OS X and it renders web contents with WebKit on AppleTV.

Application - AppleCoreMedia

AppleCoreMedia

Version1.0 @ 32 bit
DeveloperApple Inc
ParentAppleCoreMedia 1.0
Device TypeTV Device

Act as 

Crawler No
Fake No
Anonymized No

Device - Apple

BrandApple
ModelAppleTV
Platform (32 bit) by Apple Inc
Mobile No
Tablet No

Capabilities

Rendering EngineWebKit by Apple Inc (For Google Chrome, iOS (including both mobile Safari, WebViews within third-party apps, and web clips), Safari, Arora, Midori, OmniWeb, Shiira, iCab since version 4, Web, SRWare Iron, Rekonq, and in Maxthon 3.)
Pointing-
Javascript Yes
CSS Yes Version: 3
Cookies Yes
Tables Yes
Frames Yes
IFrames Yes
Background Sounds No
Java Applets Yes
VB Script No
Activex No