To reproduce:

1. Download and open attached "ScreenOrientationTest.zip" project.
2. Build and run for any Android device.
3. When application loads and video starts playing change your device orientation by rotating it.

Expected result: When device changes it orientation, video is rotated accordingly.
Actual result: Video orientation does not change despite rotating the device.

Reproduced with 2018.1.0a2, 2017.3.0b6, 2017.2.0p1, 2017.1.2p2, 5.6.4p1, 5.5.4p5, 5.4.6p3.

Verizon SM G930V*, OS:6.0.1, CPU:arm64-v8a, GPU:Adreno (TM) 530,
Build:Verizon/heroqltevzw/heroqltevzw:6.0.1/MMB29M/G930VVRU2APG3:user/release-keys

Sony C6603 (Xperia Z)*, OS:5.1.1, CPU:armeabi-v7a, GPU:Adreno (TM) 320,
Build:Sony/C6603/C6603:5.1.1/10.7.A.0.228/58103698:user/release-keys

HUAWEI EVA L19*, OS:7.0, CPU:arm64-v8a, GPU:Mali-T880,
Build:HUAWEI/EVA-L19/HWEVA:7.0/HUAWEIEVA-L19/C432B386:user/release-keys

Notes: Screen.orientation is set to auto rotation in script, but that still does not let Video to rotate. Did not reproduce on iPad Air 2 iOS 9.2.

Verified with: 2018.2.0a1, 2018.1.0b5, 2017.1.3p1.