drpistolvan
Can you do viewport with downloaded content?
Short answer, no.
Long answer, it's pretty complicated. You need to slice up your video in tiles, recode and encode it, run a adaptive streaming server with predictive AI...
There's an app on the oculus store that offers viewort, but only works with their software and their servers, which cost per Mb usage and bandwidth.
Google adaptive tile-based virtual reality video streaming
We should be glad SLR isn't even charging extra for it 🙂