Thanks for being a fan and understanding our predicament. We supported Hydrogen for as long as we could, over two years in fact (and as you can tell, we still do allow it to receive some app updates to this day) but after RED stopped supporting OS updates after about a year in, it became very difficult for us to continue adding features as the Leia ecosystem is tightly coupled between the display, firmware, OS, and software. On Lume Pad this isn’t a problem because we control the end-to-end experience including the firmware and OS, so we will continue to support it much longer than the Hydrogen’s life cycle, even as new Leia products release.
LeiaPlayer has in the past supported an undocumented feature to play back Top-Bottom stereo videos, but there have been times that we’ve temporarily dropped this support due to compatibility issues (and because our data shows it’s a very unpopular format even when we do have compatibility). I believe right now is one of those times it is incompatible in the current version, though you can try for yourself by appending _1x2.jpg or _1x2.mp4 to the end of your files.
However, Top-Bottom support is a hard requirement for supporting 360 video (as almost all 360 video that’s 3D is in Top-Bottom format) so by version 3.1 when we add VR180/360 support we will surely re-add compatibility for Top-Bottom format, at that point as a permanent feature in LeiaPlayer.