Paul,
Make this correction:
new_fov = 180 * tan(fov/4)
where fov the the field of view you get from the command line, and
fov_new is the value that you use for the filter.
You must exclude values too close to 360°, because 360° stereographic
projection is impossible.
P.S. of course fov must be converted to radians before using tan():
new_fov = 180 * tan(fov * pi / 720)
Thanks, that cleared some stuff.
Should be fixed.
Converting from equirectangular to stereographic is working fine now.
Field of view is correct.
But in the other direction from stereographic to equirectangular the
output is wrong.
The output doesn't contain any no-data areas. I mean those areas that
aren't visible in the stereographic input. These areas should be filled
with black (or better a user-defined color).
Also, the default output size should be width/height=2, but it is quadratic.
I tested with these command lines:
ffmpeg -i equirectangular_test.png -lavfi
"v360=input=e:output=sg:h_fov=300:v_fov=300" -y sg.png
ffmpeg -i sg.png -lavfi "v360=input=sg:output=e:h_fov=300:v_fov=300" -y
e.png
Michael
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