error:
ffmpeg.exe -threads 0 -hide_banner -y -i "input.mkv" -vn -sn -map 0:2 -filter_complex "asplit [f][s]; [f] pan=3.1|c0=c0|c1=c1|c2=c2|c3=c3 [r]; [s] pan=stereo|c0=0.5*c4+0.5*c6|c1=0.5*c5+0.5*c7, compand=attacks=0:decays=0
oints=-90/-84|-10/-4|-6/-2|-0/-0.3, aformat=channel_layouts=stereo [d]; [r][d] amerge [a]" -map "[a]" -c:a ac3 -center_mixlev 0.707 -b:a 640k "output.ac3"
work fine:
ffmpeg.exe -threads 0 -hide_banner -y -i "input.mkv" -vn -sn -filter_complex "asplit [f][s]; [f] pan=3.1|c0=c0|c1=c1|c2=c2|c3=c3 [r]; [s] pan=stereo|c0=0.5*c4+0.5*c6|c1=0.5*c5+0.5*c7, compand=attacks=0:decays=0
oints=-90/-84|-10/-4|-6/-2|-0/-0.3, aformat=channel_layouts=stereo [d]; [r][d] amerge [a]" -map "[a]" -c:a ac3 -center_mixlev 0.707 -b:a 640k "output.ac3"
stream map option error (-map 0:1 -map 0:2 ~~~)