[FFmpeg-user] V360 filter

[Paul B Mahol]

On 9/10/19, Michael Koch <astroelectronic at t-online.de> wrote:
> Paul,
>
>>
>>> v_fov is limited to 90°, that's not enough for little planet.
>> I increased it.
>
> ok, I will test it as soon as it's available at Zeranoe.
>
> I think the field of view isn't correct in the stereographic output.
>
> Here is a script for making really nice test images, for measuring field
> of view:
>
>
> set "IN=1200.png"                   :: Test pattern from
> http://www.paulbourke.net/dome/testpattern/1200.png
> set "OUT=double_fisheye_test.png"   :: Double fisheye test image
>
> ffmpeg -i %IN% -i %IN% -lavfi
> "[0]transpose=1[left];[1]transpose=2,geq=r='255-r(X,Y)':g='255-g(X,Y)':b='255-b(X,Y)'[right];[left][right]hstack"
> -y %OUT%

Cant you use here negate filter instead of geq?

>
> set "IN=double_fisheye_test.png"
> set "OUT=equirectangular_test.png"  :: Equirectangular test image
>
> ffmpeg -i %IN% -lavfi "v360=input=dfisheye:output=e:pitch=90" -y %OUT%
>
> Michael
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