Repro steps:

1. Open the projects "TestScene" Scene
2. Enter Play mode

Expected result: Video is rendered without artifacts
Actual result: Video renders with artifacts or Editor crashes

Fixed in: 2018.1.0a2

Reproduced with: 2017.1.0b5
Did not reproduce on: 5.6.1f1, 5.6.0f3, 5.5.3f1(Video player component wasn't available in this version)

Note:
The Video renders with artifacts only on MacOS version 10.12.3 and up
On Mac OS 10.9.5, 2017.1.0b5 crashes and 5.6.1f1 the play back stutters
Added video of repro and what should happen