[FFmpeg-trac] #10912(undetermined:new): d_fov and h_fov not working well when converting equirectangular to rectilinear (v360)

[FFmpeg]

#10912: d_fov and h_fov not working well when converting equirectangular to
rectilinear (v360)
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             Reporter:  0kajuna0     |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  v360,        |               Blocked By:
  equirect, rectilinear              |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Michael Koch):

 > We can try to correct this by specifying width and height, but the
 result is still distorted
 > % ffmpeg -i in.png -vf
 v360=e:rectilinear:h_fov=56:v_fov=112:w=1440:h=2880 d.png

 It's still distorted because you did use the wrong value for h.
 The correct value would be: h = 1440 / tan(28°) * tan(56°) = 4015
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Ticket URL: <https://trac.ffmpeg.org/ticket/10912#comment:5>
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