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doc/filters: add one more example for afir filter usage

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Paul B Mahol 2023-11-19 13:03:51 +01:00
parent 6fb1eaf73a
commit 496df68815
1 changed files with 9 additions and 3 deletions
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doc/filters.texi
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@ -1804,7 +1804,7 @@ For negative values, no norm is calculated, and IR coefficients are not modified
Default is @var{1}. Default is @var{1}.
@item irlink @item irlink
For multichannel IR if this option is set to @var{true}. All IR channels will be For multichannel IR if this option is set to @var{true}, all IR channels will be
normalized with maximal measured gain of all IR channels coefficients as set by @code{irnorm} option. normalized with maximal measured gain of all IR channels coefficients as set by @code{irnorm} option.
When disabled, all IR coefficients in each IR channel will be normalized independently. When disabled, all IR coefficients in each IR channel will be normalized independently.
Default is @var{true}. Default is @var{true}.
@ -1888,9 +1888,15 @@ ffmpeg -i input.wav -i middle_tunnel_1way_mono.wav -lavfi afir output.wav
@item @item
Apply true stereo processing given input stereo stream, and two stereo impulse responses for left and right channel, Apply true stereo processing given input stereo stream, and two stereo impulse responses for left and right channel,
the impulse response files are files with names l_ir.wav and r_ir.wav: the impulse response files are files with names l_ir.wav and r_ir.wav, and setting irnorm option value:
@example @example
"pan=4C|c0=FL|c1=FL|c2=FR|c3=FR[a];amovie=l_ir.wav[LIR];amovie=r_ir.wav[RIR];[LIR][RIR]amerge[ir];[a][ir]afir=irfmt=input:irgain=-5dB,pan=stereo|FL<c0+c2|FR<c1+c3" "pan=4C|c0=FL|c1=FL|c2=FR|c3=FR[a];amovie=l_ir.wav[LIR];amovie=r_ir.wav[RIR];[LIR][RIR]amerge[ir];[a][ir]afir=irfmt=input:irnorm=1.2,pan=stereo|FL<c0+c2|FR<c1+c3"
@end example
@item
Similar to above example, but with @code{irgain} explicitly set to estimated value and with @code{irnorm} disabled:
@example
"pan=4C|c0=FL|c1=FL|c2=FR|c3=FR[a];amovie=l_ir.wav[LIR];amovie=r_ir.wav[RIR];[LIR][RIR]amerge[ir];[a][ir]afir=irfmt=input:irgain=-5dB:irnom=-1,pan=stereo|FL<c0+c2|FR<c1+c3"
@end example @end example
@end itemize @end itemize