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doc/filters: add acrossover examples

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Paul B Mahol 2020-11-27 14:27:06 +01:00
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doc/filters.texi
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@ -541,6 +541,29 @@ Set filter order. Availabe values are:
Default is @var{4th}.
@end table
@subsection Examples
@itemize
@item
Split input audio stream into two bands (low and high) with split frequency of 1500 Hz,
each band will be in separate stream:
@example
ffmpeg -i in.flac -filter_complex 'acrossover=split=1500[LOW][HIGH]' -map '[LOW]' low.wav -map '[HIGH]' high.wav
@end example
@item
Same as above, but with higher filter order:
@example
ffmpeg -i in.flac -filter_complex 'acrossover=split=1500:order=4th[LOW][HIGH]' -map '[LOW]' low.wav -map '[HIGH]' high.wav
@end example
@item
Same as above, but also with additional middle band (frequencies between 1500 and 8000):
@example
ffmpeg -i in.flac -filter_complex 'acrossover=split=1500 8000:order=4th[LOW][MID][HIGH]' -map '[LOW]' low.wav -map '[MID]' mid.wav -map '[HIGH]' high.wav
@end example
@end itemize
@section acrusher
Reduce audio bit resolution.