Can someone answer this? The 4k video MP4 files from the ThetaV all seem to need to go through a laborious transcription into a new file denoted X_er in order to be played in the Theta programme. ( Camera-stitched or unstitched ) If the original file is played directly in the GoPro spherical programme it plays without stitching, so the _er transformation is necessary. However I can just double-click on an original ThetaV 4K video in W10 and it plays just perfectly without any fuss.
So what is the laborious _er transformation all about? I can imagine that it might have to do with the view-oriented surround sound aspect of playback but surely that would be an extra option selectable from basic playback if the engineers weren’t too anal about everything being perfectly loaded at playback. (?)