A full list of natively supported formats can be found here: https://msdn.microsoft.com/en-us/library/windows/desktop/dd757927(v=vs.85).aspx

https://msdn.microsoft.com/en-us/windows/uwp/audio-video-camera/supported-codecs

H.264 decoder supports up to profile L5.1, but Windows 10 supports above L5.1 profile: https://msdn.microsoft.com/en-us/library/windows/desktop/dd797815(v=vs.85).aspx

H.265 decoder specs are here: https://msdn.microsoft.com/en-us/library/windows/desktop/mt218785(v=vs.85).aspx

Windows 10 adds native support for the following formats:

• H.265 / HEVC
• MKV
• FLAC
• HLS Adaptive Streaming
• MPEG-DASH

Windows 10 and UWP HLS features supported: https://docs.microsoft.com/en-us/windows/uwp/audio-video-camera/hls-tag-support

Windows 10 and UWP MPEG-DASH features supported: https://docs.microsoft.com/en-us/windows/uwp/audio-video-camera/dash-profile-support

Windows 10 Fall Update seems to remove native H.265 / HEVC support for some users and requires them to download the free HEVC Video Extension. Before update KB4056892 (4 Jan 2018), users also had to open a H.265 video in the Films & TV app after a restart before AVPro Video could play H.265 videos. This update seems to fix that however.