[FFmpeg-user] Please increase the number of variables

[Paul B Mahol]

On Fri, Jun 3, 2022 at 5:05 PM Michael Koch <astroelectronic at t-online.de>
wrote:

> Hello,
>
> I'd like to ask if the number of variables in expressions could be
> increased from 10 to 25 please. I mean the st() and ld() functions. I'm
> just programming a realtime wormhole simulation and the limitation to 10
> variables is becoming nasty. I did already begin to re-use the same
> variables for different things, but that makes debugging complicated. It
> would be so much easier to have more variables and use each one only for
> one thing.
> What you see below is only a small part of the code.
>

Why you doing that way, this is the most inefficient way to do it.


>
> Thanks,
> Michael
>
>
> ffmpeg -f lavfi -i nullsrc=size=%OUT_W%x%OUT_H% -vf
> format=pix_fmts=gray16le,geq='^
> st(0,PI/360*%OUT_H_FOV%*((2*X+1)/%OUT_W%-1));^
> st(1,PI/360*%OUT_V_FOV%*((2*Y+1)/%OUT_H%-1));^
> st(4,cos(ld(1))*sin(ld(0)));^
> st(5,sin(ld(1)));^
> st(6,cos(ld(1))*cos(ld(0)));^
> st(7,atan2(ld(5),ld(4)));^
> st(8,acos(ld(6)));^
> st(9,if(lte(ld(8),%RS%/180*PI),%OUT_W%,0));^
>
> st(8,if(gt(ld(8),%RS%/180*PI),ld(8)-(2*%RS%/180*PI/(ld(8)-%RS%/180*PI)),0));^
> st(4,sin(ld(8))*cos(ld(7)));^
> st(5,sin(ld(8))*sin(ld(7)));^
> st(6,cos(ld(8)));^
> st(7,atan2(ld(4),ld(6)));^
> st(8,asin(ld(5)));^
> ld(9)+0.5*%IN_W%*(1+ld(7)/%IN_H_FOV%*360/PI)' -frames 1 -y xmap.pgm
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