Marco Mircoli (12021-02-03): > wandering if it is possible to process just the 1st audio channel of an > input. > I don't know how many channels I will have as input, but I know that I have > to process just the 1st and the others I have not to considerate. > > INPUT from mono to multichannel > filters..... > OUTPUT just one channel (mono) > > I've tried this but doesn't works > > ffmpeg -i FILE_FROM -map_channel 0.0.0 -af > highpass=f=70,adeclick,loudnorm=I=-16.5:TP=-1.5:LRA=7 FILE_TO
Just use pan=mono|c0=c0 to extract the channel you want wherever you want in the graph. No need to completely split the channels, it was meant for versions that lack the pan filter. Regards, -- Nicolas George
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