222_to_51_dmx_ff

REM Front Right
REM Front Centre
REM LFE Left
REM Back Left
REM Back Right
REM Front Left/Centre
REM Front Right/Centre
REM Back Centre
REM LFE Right
REM Side Left
REM Side Right
REM Top Front Left
REM Top Front Right
REM Top Front Centre
REM Top Centre
REM Top Back Left
REM Top Back Right
REM Top Side Left
REM Top Side Right
REM Top Back Centre
REM Bottom Front Centre
REM Bottom Front Left
REM Bottom Front Right

@echo off

REM FC + (FLc + FRc)*c + (TpFC + TpC*f + BtFC)*e
REM FL + FLc*c + SiL*d + (TpFL + TpSiL*d + BtFL)*e
REM FR + FRc*c + SiR*d + (TpFR + TpSiR*d + BtFR)*e
REM BL + BC*g + SiL*d + (TpBL + TpBC*g + TpSiL*d + TpC*f)*e
REM BR + BC*g + SiR*d + (TpBR + TpBC*g + TpSiR*d + TpC*f)*e
REM LFE (LFE1 + LFE2)*l
REM a: -3 dB, b: -3 dB, c: -4.5 dB, d: -4.5 dB, e: 0 dB, f: -6 dB, g: -3 dB, l: -3 dB

REM db to scalar approximately
set coeff_c=0.6
set coeff_d=0.6
set coeff_f=0.5
set coeff_g=0.7

ffmpeg -y -i 222.wav -af ^
"pan=5.1^
|c0=c0+%coeff_c%*c6+%coeff_d%*c10+c12+%coeff_d%*c18+c22^
|c1=c1+%coeff_c%*c7+%coeff_d%*c11+c13+%coeff_d%*c19+c23^
|c2=c2+%coeff_c%*c6+%coeff_c%*c7+c14 +%coeff_f%*c15+c21^
|c3=c3+c9^
|c4=c4+%coeff_g%*c8+%coeff_d%*c10+c16+%coeff_g%*c20+%coeff_d%*c18+%coeff_f%*c15^
|c5=c5+%coeff_g%*c8+%coeff_d%*c11+c17+%coeff_g%*c20+%coeff_d%*c19+%coeff_f%*c15^
"^
 51.wav

pause