To reproduce:
1. Open users attached project.
2. Open videoplayer scene
3. Create a folder in your PCs local disk and put there video.mov from assets folder.
4. In scene videoplayer select Video Player object and in Inspector select path to the video file.
5. Enter play mode and observe that video player plays video.
6. File -> Build settings (make sure you have selected scene to build) and click build and run.

Expected : In built project video is played same as in play mode.
Actual: Video is not played at all.

Reproduced on : 5.6.0b1, 5.6.0f1, 5.6.0f3, 5.6.0p1, 2017.1.0b1

Tested builds : Windows, Mac OS X

Note : H.264 video.

Fixed in : 2017.1.0b4