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af_drc: remove

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Remove low quality drc filter. Anyone whishing to have dynamic range
compression should use the much more powerful acompressor ffmpeg filter:

    mpv --af=lavfi=[acompressor] INPUT

Or with parameters:

    mpv --af=lavfi=[acompressor=threshold=-25dB:ratio=3:makeup=8dB] INPUT

Refer to https://ffmpeg.org/ffmpeg-filters.html#acompressor for a full
list of supported parameters.

Signed-off-by: wm4 <wm4@nowhere>
This commit is contained in:
Jan Janssen
2017-03-17 16:49:28 +01:00
committed by wm4
parent d663a0e90d
commit 222899fbbe
7 changed files with 2 additions and 460 deletions
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23
DOCS/man/af.rst
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@@ -319,29 +319,6 @@ Available filters are:
the mixing matrix at runtime, without reinitializing the entire filter
chain.
``drc[=method:target]``
Applies dynamic range compression. This maximizes the volume by compressing
the audio signal's dynamic range. (Formerly called ``volnorm``.)
``<method>``
Sets the used method.
1
Use a single sample to smooth the variations via the standard
weighted mean over past samples (default).
2
Use several samples to smooth the variations via the standard
weighted mean over past samples.
``<target>``
Sets the target amplitude as a fraction of the maximum for the sample
type (default: 0.25).
.. note::
This filter can cause distortion with audio signals that have a very
large dynamic range.
``scaletempo[=option1:option2:...]``
Scales audio tempo without altering pitch, optionally synced to playback
speed (default).