Currently, the video capture feature encodes at 60fps (or tries to; my videos always encode between 57-59fps). Is there a way to record video at half the framerate (30fps instead of 60) or better yet force the game itself to run at that speed (e.g. by controlling MinimumVsyncs with adb)? Not every type of app game needs 60fps to accurately present it, and many Gear VR Youtubers upload in 30fps. Recording overhead would be significantly reduced, and the image quality would be improved at the same bitrate.
S7 Exynos Nougat. 2017 Gear VR. Public test channel.