Does anyone know what happens if you try playing side-by-side in just the standard plex app? Will it appear in a correct format for google cardboard? If so I might convert a few movies, as I am sure my wife and son would appreciate being able to see the Hobbit movies and such in 3-D.
My mom plays Penguins of Madagascar [H-SBS] on her TV without issue. In fact, I thought it would be more complicated then simply hitting play, but it wasn't.
While the plex app plays the movie just fine "as-is" (two images, side-by-side) seconds after she starts to play the movie the TV auto-switched to 3D mode.
Here's a site with demo 3D files (h-ou & h-sbs) you can download. http://hdvidzpro.pro/video/3d-lg-demo
Yes. As I understand it the nice part about those two particular formats is all the support for playing them is on your playback software/hardware. The downside is you have a movies that will only playback correctly on hardware that understands that format. If I try to play full side by side on my TV, nothing will play at all because it doesn't support 3-D or resolutions beyond 1080P. If I play half side by side on my TV, it shows up as two movies side by side... Which means if I want to have 3-D videos I have to have 3 copies of each movie. One for 2-D, one for 3-D half side by side, and one for 3-D full side by side... That is 4x the amount of disk space usage.
When you buy a 3-D blueray, you don't have 3 copies of the same movie on the disk. You just have one, and it plays perfectly on your 3-D TV and on your 2-D TV at full resolution. Why is that? Because there is a standard implemented in your 3-D blueray player:
This is a video encoding that adds a delta layer to the 2-D video for 3-D rendering. You can also rip movies to this format. If you do so, hardware that knows how to read your mkv files and play 3-D will do so. Hardware that doesn't will play 2-D. My experience is this increases disc usage for movies like The Hobbit, by about 30%.
Now the biggest problem with trying to do 3-D with plex, is I don't think it knows how to convert MVC to other 3-D formats. And it is unclear if the Daydream platform knows how to do this either. In which case you are going to need the side-by-side, so plex doesn't have to convert. But how in the world to I tell plex when I watch on my TV I don't want side-by-side, and when I watch on my phone I want side-by-side if and only if I'm wearing a headset?
To my knowledge there is no easy way to tell plex which duplicate video to prefer, especially on a case by case basis... So even if you have the disc space for all that data replication, you'll need to know how the plex team resolved this dilemma, so you know how to populate your files onto the server.