Q: Is viewport limited to videos streamed from SLR servers? Or can it also be used for local files not downloaded from SLR?
A: Files need to be specially encoded. We are finishing very big infrastructure for that, both hardware and software. That's why you only see like 20 something videos for now. We are very close to start processing the whole library for Androids. So yeah, servers only.
I can't see how it will work locally due to complexity.