Earlier, I had downloaded some youtube 360 VR files, which were in equirectangular format, converted to either fulldome or pre-warped mirrordome using OCVWarp, and projected on our dome. For example
360° Video of Vidhan Soudha, Bengaluru During On Going Lock-Down
But (recently?) when I tried out 360 VR 4K videos like this one
Tim Peake ISS 360° Planetarium Tour
the format was different - not equirectangular. While I thought about exploring the format to find out some workaround, found that Paul Bourke has already done it in Jan 2020.
Apparently it's 6 faces of the conventional cube map, but resized a bit. Ordered as left-front-right
bottom-back-top
And he mentions the ffmpeg command to convert it to equirectangular, which I tested and seemed to work,
ffmpeg \ -y \ -hide_banner \ -i input.mkv \ -vf "v360=c3x2:e:cubic:in_forder='lfrdbu':in_frot='000313',scale=3840:1920,setsar=1:1" \ -pix_fmt yuv420p -c:v libx264 -preset faster -crf 21 \ -c:a copy -ss 16 -t 10 -movflags +faststart \ output.mp4
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