It should be recognized from scratch by Littstar if its "2D" 360 because they write

Snip:

File naming conventions

There are specific naming conventions to which videos must adhere for the app to recognize the type of video it needs to render. By default, the Littlstar player will attempt to render a mono (non 3D) equirectangular 360 video. Therefore it is not necessary to explicitly add "360" to the file name.

here http://docs.littlstar.com/display/CG/PlayStation+VR+Video+Sideloading

If you have 2 near similar Pics over and under then it would be a Steroscopic 3D Video and would need either

Filename_ou.mp4

or

• Filename_360_ou.mp4

to be played in 3D then.