Paul,
Stereographic projection aka little planet added as both input and output.
Single fisheye is little different.
v_fov is limited to 90°, that's not enough for little planet.
-- I think the d_flip parameter needs some more documentation. What's an
"in-depth" flip?
It swaps back with front.
Please add it to the documentation, "in-depth" flip isn't self-explaining.
I have a workaround for converting an equirectangular video to a little
planet video, but I use a fisheye projection (vertical coordinate in
equirectangular image is proportional to distance from image center in
little planet image):
set "IN=test3.mp4" :: Equirectangular input video
set "H=960" :: Height of input video (width = 2 * height)
set "S=1080" :: Size of quadratic little planet output video
set "OUT=out.mp4" :: Output video
rem Create the xmap file
ffmpeg -f lavfi -i nullsrc=size=%S%x%S% -vf format=pix_fmts=gray16le,^
geq='%H%*(0.9999+atan2(Y-%S%/2,X-%S%/2)/PI)' -frames 1 -y xmap.pgm
rem Create the ymap file
ffmpeg -f lavfi -i nullsrc=size=%S%x%S% -vf format=pix_fmts=gray16le,^
geq='%H%*(1-hypot((2*X/%S%)-1,(2*Y/%S%)-1))' -frames 1 -y ymap.pgm
rem Apply the remap filter to the video
ffmpeg -i %IN% -i xmap.pgm -i ymap.pgm -lavfi
"format=pix_fmts=rgb24,remap" -y %OUT%
Michael
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