Audio-MPEG
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If set to a frequency (in Hertz), the input will pass through a filter
before being encoded. Values range from 1 to 50_000. Default is for LAME to
choose.
=item I<no_lowpass_filter>
If this exists, filtering is disabled.
=item I<lowpass_filter_width>
The width of the filter expressed as a percentage of the filter frequency.
Defaults to 15%.
=item I<highpass_filter_frequency>
If set to a frequency (in Hertz), the input will pass through a filter
before being encoded. Values range from 1 to 50_000. Default is for LAME to
choose. If set to -1, filtering is disabled.
=item I<no_highpass_filter>
If this exists, filtering is disabled.
=item I<highpass_filter_width>
The width of the filter expressed as a percentage of the filter frequency.
Defaults to 15%.
=item I<apply_delay>
This will correct for the MP3 encoding delay. If set to 1, the first
B<encoder_delay>() samples of the first frame's PCM stream will be
skipped and not encoded. Default is to not correct for delay.
=back
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