360 Spherical Video Playback

Hey guys,
so I dealing the past few days with a new challenge, that is playback a 360 spherical 4k video into Unity to Oculus, here is what I already have tryied, and the results:

General: All tests was made with a sphere with reverve normals into it. The tests was made on a PC with 32GB RAM and with a NVIDIA Geforce GTX 970

Scenario 1:
Imported the video (3840x2160) into Unity and add it as MovieTexture on the sphere. It results on a very low texture quality and very low FPS on Oculus (~10fps). So I converted the video first with FFMPEG2THEORA to OGV file, and it results with a high quality into UNITY but the FPS are still low.

Scenario 2:
Imported the video as PNG Sequence into UNITY (3840x2160) and tryied to change the sphere material to the images in real time with script (Resources.Load), tryied in diferente ways, Unload the last used texture, loading the texture not in the update cycles but only when it reach 24 FPS count, ...
But again, FPS is very low (the same or closer as early ~10fps)

Scenario 3:
I tryied to resize it to 2048x... and made the last two tests again, it a increase in FPS (~15-20fps) but not good enough, and the quality is not perfect anymore.


So my ways in Unity kind of ended, I dont know what to do anymore. Anyone have made something similar in UNITY that can give me some advices?

Thanks a lot, and sorry my terrible english writing skills.