360 Degree Video Encoding for Playstation Media Player and PSVR
A new Playstation Media Player has been released. As of version 5.0, more possibilities exist for media. At least photos worked very good so far, I watch equirectangular 360° images that I took with my Xiaomi Mi Sphere camera, stitched with the camera's software. But it didn't play any videos I tried.

However, I managed to watch videos that I took in 3.5k (3456x1728) with the Xiaomi Mi Sphere, stitched with the camera's software and then converted with "Littlstar PSVR Encoder" by Stormware: http://stormwave.uk/#downloads. It even kept the original resolution of 3456px width, but the result still doesn't look awesome. For macOS and Linux, you can try littlestar's official ffmpeg wrapper tool: https://github.com/littlstar/ls-psvr-encoder, I haven't tried it so far.

Littlstar will play stereoscopic videos, too. You can read more on "sideloading" in Littlstar (means: Not streamed from the Littlstar cloud) here: https://medium.com/@littlstarmedia/side-loading-now-available-on-the-ps-vr-app-fe362f6c3e94

I used a PS4 Slim, so a PS4 Pro is not required. I dunno whether the results might be any better on a PS4 Pro.