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doc/filters: clarify resampling and linear mode in loudnorm

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Gyan Doshi
2020-01-20 17:24:11 +05:30
parent 8c3e9c9cbb
commit 38081acc01
1 changed files with 9 additions and 6 deletions
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doc/filters.texi
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@@ -4223,8 +4223,8 @@ If the specified value is not valid, it is ignored and prior one is kept.
EBU R128 loudness normalization. Includes both dynamic and linear normalization modes. EBU R128 loudness normalization. Includes both dynamic and linear normalization modes.
Support for both single pass (livestreams, files) and double pass (files) modes. Support for both single pass (livestreams, files) and double pass (files) modes.
This algorithm can target IL, LRA, and maximum true peak. To accurately detect true peaks, This algorithm can target IL, LRA, and maximum true peak. In dynamic mode, to accurately
the audio stream will be upsampled to 192 kHz unless the normalization mode is linear. detect true peaks, the audio stream will be upsampled to 192 kHz.
Use the @code{-ar} option or @code{aresample} filter to explicitly set an output sample rate. Use the @code{-ar} option or @code{aresample} filter to explicitly set an output sample rate.
The filter accepts the following options: The filter accepts the following options:
@@ -4263,10 +4263,13 @@ Set offset gain. Gain is applied before the true-peak limiter.
Range is -99.0 - +99.0. Default is +0.0. Range is -99.0 - +99.0. Default is +0.0.
@item linear @item linear
Normalize linearly if possible. Normalize by linearly scaling the source audio.
measured_I, measured_LRA, measured_TP, and measured_thresh must also @code{measured_I}, @code{measured_LRA}, @code{measured_TP},
to be specified in order to use this mode. and @code{measured_thresh} must all be specified. Target LRA shouldn't
Options are true or false. Default is true. be lower than source LRA and the change in integrated loudness shouldn't
result in a true peak which exceeds the target TP. If any of these
conditions aren't met, normalization mode will revert to @var{dynamic}.
Options are @code{true} or @code{false}. Default is @code{true}.
@item dual_mono @item dual_mono
Treat mono input files as "dual-mono". If a mono file is intended for playback Treat mono input files as "dual-mono". If a mono file is intended for playback