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Android Video On Texture Playback Shows only black screen

So i'm trying to use the VideoTexture-esque features that the Video Playback sample comes with, to play a video on a texture on my android device. In my scene, there is an instance of the 'video' prefab that comes with the sample, a camera, and a playbackController script to manage playing the video without the image recognition software. When i play the video, the texture shows only black for the full duration of the video. While the video is playing, logcat outputs a wall of this message:

E/GLConsumer(19298): [unnamed-19298-1] checkAndUpdateEglState: invalid current EGLDisplay
E/VuforiaMedia(19298): Error in updateVideoData: null

The video plays correctly in fullscreen mode (with no errors like above showing), and the same issue perisits regardless of where the video is coming from (streamingassets folder or sd-card). I have tested this on both a Galaxy S5 with 4.4.1, and a Nexus 5 with 5.1.1 with the same results.

It's also probably worth mentioning that inside unity, whenever i build the project, i am met with the error:

Project 'C:\Users\xxxxxx\Unity\VuforiaTester\Assets\Plugins\Android\VuforiaMediaSource' is not an android library.
UnityEditor.BuildPlayerWindow:BuildPlayerAndRun()

Is this something to do with me not using the camera that comes with the sample? I was under the impression that the camera is only needed for carrying the licence for Reco'ing, and as my app does not really need to do that, i omitted it.