[FFmpeg-user] 'equalizer' audio filter
darkmoon at verizon.net
Thu May 8 18:39:33 CEST 2014
I read the entry for this filter in the User Guide, then searched the
web when I found the Guide entry mostly limited to identifying options
for the filter, with little explanation of how the options actually
function, and how they are to be used to create an actual "equalizer."
What I found was no help either to a casual user who is not conversant
with concepts of audio engineering (like "Q-Factor" or "slope," and how
to determine what values to use in a filter). I hope I can frame my
question a bit more clearly than what I found in my search.
I would like to use 'equalizer' in the manner of a simple graphic
equalizer, complete with band sliders that have '0 gain' center
positions. My ideal comand-line 'equalizer' filter would take a series
of "band=gain" pairs, where each "band" would represent a slider, and
"gain" the position of each slider. "Gain" would default to 0 if a
specific "band" is not identified, equivalent to the center position of
a slider on a graphic equalizer.
Is there a way to use ffmpeg 'equalizer' in this manner? How would it
be done? What are some sane and practical values for setting the center
and width of each band (or where can I find that info)? Some examples
would be lovely. Thank you...
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