Fix trac issue #3850.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Add a tlength option with frequency and timeclamp variable

Add to the volume option support for frequency and timeclamp variable,
   a_weighting, b_weighting and c_weighting functions

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

8x8 is about 5x faster than 16x16 on 1080p input. Since a block size of
8x8 makes the filter almost usable (time wise) and it's not obvious if
8x8 or 16x16 is better from a quality PoV (it really depends on the
input and parameters), the filter now defaults to 8x8, and as a result
libavfilter is micro bumped.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

This reverts commit 35b05c5184.
A warning is introduced in case this option is used.

Reviewed-by: Stefano Sabatini <stefasab@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Allow to dynamically evaluate the font color.

Signed-off-by: Stefano Sabatini <stefasab@gmail.com>

It evaluates expression and outputs it as integer value, using specified
format.

Address trac ticket #3699.

Signed-off-by: Stefano Sabatini <stefasab@gmail.com>

Fixes ticket #3758

Reviewed-by: Andrey Utkin <andrey.krieger.utkin@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Reviewed-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Dave Rice <dave@dericed.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Dave Rice <dave@dericed.com>
Reviewed-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Partially fixes Ticket #3404 (xbr filter remaining)

Based on suggested change by Clément Bœsch.

Signed-off-by: Lou Logan <lou@lrcd.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Resolution can be 1920x1080 or 960x540.

Signed-off-by: Lou Logan <lou@lrcd.com>

Signed-off-by: Mark Heath <silicontrip@gmail.com>
Signed-off-by: Dave Rice <dave@dericed.com>
Signed-off-by: Clément Bœsch <u@pkh.me>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

this filter is the same as showspectrum but with constant Q transform,
so frequency is spaced logarithmically

Signed-off-by: Lou Logan <lou@lrcd.com>

Found-by: bloody123
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: ValdikSS <iam@valdikss.org.ru>

Signed-off-by: Anton Khirnov <anton@khirnov.net>

Introduce the `font` option and make it optional to pass a fontfile.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

This adds a new "replaygain_noclip" option to the filter, and, if enabled,
limits the gain applied for tracks where clipping would occur.

Signed-off-by: Anton Khirnov <anton@khirnov.net>

This aims to standardize the English used in the libavfilter
documentation, describing the same thing in the same way more often,
and significantly reduce the amount of outright errors, including
run-on sentences and sentence fragments.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

Ported asettb (including the sr option for audio sample rate) from FFmpeg,
and copied/modified the existing settb documentation for asettb.

Signed-off-by: Katerina Barone-Adesi <katerinab+libav@gmail.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>

This adds a new "replaygain_preamp" option to the filter, and simply adds its
value to the replaygain gain value.

Signed-off-by: Anton Khirnov <anton@khirnov.net>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Anton Khirnov <anton@khirnov.net>

Signed-off-by: Nicholas Robbins <nickrobbins@yahoo.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

There were a few grammar and spelling mistakes in this filter
description. I went through it and corrected them without changing
the meaning.