Quote:
Originally Posted by tebasuna51
1) If your input is 7.1, first do a 7.1 -> 5.1 downmix with the compand selected (see precedent posts):
-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:points=-90/-84|-8/-2|-6/-1|-0/-0.1, aformat=channel_layouts=stereo [d]; [r][d] amerge [a]" -map "[a]"
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WARNING: when use these filters with a recent ffmpeg v5.1 there are a
regression detected.
Use a ffmpeg v4.4 until the regression was solved.