-If you want to use HTTP input (you probably want to), you want VLC 2.2.0
-or newer. Then start the VLC encoder with the “metacube” flag to the http
+Cubemap does not in itself understand the format of video streams;
+it requires HTTP input that is already delineated into headers and blocks,
+so that it knows what parts of the stream to skip to clients that
+connect after the stream has been. (The exception is self-synchronizing
+streams with no headers, such as MPEG-TS. These can also be sent or
+received over UDP) The input format is specific to Cubemap and is called
+Metacube (technically, Metacube2, but Metacube1 is long gone and nothing
+uses it anymore). Currently, you have three options to create Metacube
+video streams: VLC, Nageru or FFmpeg with a hack.
+
+For VLC, start the VLC encoder with the “metacube” flag to the http