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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}.
@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.
When disabled, all IR coefficients in each IR channel will be normalized independently.
Default is @var{true}.
@ -1888,9 +1888,15 @@ ffmpeg -i input.wav -i middle_tunnel_1way_mono.wav -lavfi afir output.wav
@item
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
"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 itemize