Apple has released the fourth beta of tvOS 13 to the developers
AuthenticationServicestvOS 13 Beta 4 released
Known Issues
Passing both ASAuthorizationAppleIDProvider and ASAuthorizationPasswordProvider to ASAuthorizationController is not currently supported on tvOS. (50897359)
AVFoundation
New Features
AVFoundation now supports encoding video with alpha channels using HEVC. Videos encoded in this manner are broadly supported in AVFoundation APIs, and by Safari within web pages. Technical details of the format can be found in the Interoperability Profile specification. (8045917)
