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Work in Progress,
Equi-Angular Cubemap
ffmpeg v360 format uses a 3wx2h array.

Equi-Angular Cubemap in ffmpeg v360:



		left   0 front 0 right 0
down -90 back 90 up -90
ffmpeg -i e.tif -vf v360=input=equirect:output=eac eac.tif

Paul Bourke has worked on these for a long time: Paul Bourke
The link I was thinking of is gone, but look around anyway.
Google blog had a discussion on Equi-Angular Cubemaps in video in 2017: bringing pixels front and center vr video

In 3D VR, that pattern is repeated horizontally so you have that array for each left and right eye for a total of twelve square images.

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A small list, most from Black Magic Design's DaVinci Resolve/Fusion KartaVR documentation:

16:9 Video Frame Padded Fulldome/Domemaster/Angular Fisheye 180°
4:3 Video Frame Padded Fulldome/Domemaster/Angular Fisheye 180°
Angular Fisheye 360°/Light Probe IBL/Angular
Cube faces
Cylinder 360°x90°, Cylindrical
Facebook 3x2 Cubemap
Facebook Pyramid 1:1
Facebook Vertical Strip Cubemap
Flat bottom LatLong/Equirectangular/Spherical 360°x180°
Fulldome/Domemaster/Angular Fisheye 180°
Garden Gnome 3x2 Cubemap
Gear VR/Octane ORBX/VRay based 6:1 Horizontal Strip Cubemap:
  Left Right Top (Rotated 180°) Bottom (Rotated 180°) Back Front
Gear VR stereo panorama. Right (R) and left (L) camera cubic faces:
  R-Left R-Right R-Top (Rotated 180°) R-Bottom (Rotated 180°) R-Back R-Front
  L-Left L-Right L-Top (Rotated 180°) L-Bottom (Rotated 180°) L-Back L-Front
High Resolution Fulldome/Domemaster/Angular Fisheye 180°
Horizontal 6:1 Strip Cubemap
Horizontal Cross Cubemap
Horizontal Tee Cubemap
LatLong/Equirectangular/Spherical 360°x180°
LG 360 Camera Unsitched
Mental Ray Cube 1 Based 6:1 Horizontal Strip Cubemap
Ricoh Theta S Camera Unstitched
Samsung Gear 360 Camera Unstitched
Starglobe 1:1 Cubemap
Strip, vertical, horizontal
StripVR, horizontal
Vertical 6:1 Strip Cubemap
Vertical Cross Cubemap
Vertical Strip Cubemap
Vertical Tee Cubemap

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Horizontal cross format
this is not for or from ffmpeg v360



Horizontal cross, this order is not ffmpeg v360 order. But it shows the pitch rotation of top (up) and bottom (down) faces.

Panotools and similar:
		Face front right back  left  top  bottom
Yaw 0 90 180 -90 0 0
Pitch 0 0 0 0 90 -90

I like this horizontal cross format, you can fold and glue a print to form an actual cube.

It is visually rewarding, horizontal images are in a continuous sequence: "lfrb", "frbl", "rblf" or "blfr" + top (up) and bottom (down).

But this does not work for the ffmpeg v360 format, where the horizontal cube faces are not positioned sequentially, default "rludfb".

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