Why is stereoscopic video lagging on Gear VR?

I’m on UE 4.17 - Oculus’s Fork - https://github.com/oculus-vr/unrealengine

I’ve gotten monoscopic 360 video playback functional on the Gear VR, Samsung Galaxy S7, by following this thread - https://forums.unrealengine.com/deve...ideo-playback=

But when I try to play a stereoscopic 360 video, it stutters whenever I move my head. When stationary, video is smooth as can be. This problem does not happen in the editor.

Changing the resolution, bit rate, fps, and codec of the video seems to have no effect. The jitter is still there. Anyone have any ideas what might be causing this?

UPDATE: When I loaded the project into the Oculus 4.16 engine version, the lag apparent on the Gear VR now shows up while playing in VR Preview in the editor.

Looks like this is because playback is at 30 FPS and the game is running at 60 FPS. Locking the framerate to 30 resolved the video problem.

So even though the video is 30 FPS, why would it play correctly on the PC at 90 FPS? It didn’t use to. What changed in 4.17? And when can we expect to see that update applied to the Android video player?