There is a rounding or +-1 error in the v360 filter when converting from
double_fisheye to equirectangular. The error is visible with or without
interpolation. Can be reproduced as follows:
ffmpeg -f lavfi -i color=black:s=160x80 -lavfi
geq=r='255*mod(trunc(4*X/W),2)':g='255*trunc(2*X/W)':b='255*trunc(2*Y/H)'
-frames 1 -y test.png
ffmpeg -i test.png -lavfi
v360=dfisheye:e:ih_fov=180:iv_fov=180:interp=near -y eq.png
Michael
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