On 2/3/21 7:40 AM, Marco Mircoli wrote:
Hello,
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
Any suggest?
Thanks.
S.
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I do not know what you're specifically trying to accomplish with this,
but I have a script in which I need to reduce videos with an unknown
number of channels into 2. How I accomplished it was to dump the audio
to a stereo wave file, run some external processing on it, then
multiplex it back with the original video while encoding it as a stereo
MP3 audio track. If you cannot find a better solution, perhaps
something similar would work for your purpose, only using -ac 1 instead
of -ac 2 as I do?
Just an idea.
Jim
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