@end example
@end itemize
+@section eq
+Set brightness, contrast, saturation and approximate gamma adjustment.
+
+The filter accepts the following options:
+
+@table @option
+@item contrast
+Set the contrast value. It accepts a float value in range @code{-2.0} to
+@code{2.0}. The default value is @code{0.0}.
+
+@item brightness
+Set the brightness value. It accepts a float value in range @code{-1.0} to
+@code{1.0}. The default value is @code{0.0}.
+
+@item saturation
+Set the saturation value. It accepts a float value in range @code{0.0} to
+@code{3.0}. The default value is @code{1.0}.
+
+@item gamma
+Set the gamma value. It accepts a float value in range @code{0.1} to @code{10.0}.
+The default value is @code{1.0}.
+
+@item gamma_r
+Set the gamma value for red. It accepts a float value in range
+@code{0.1} to @code{10.0}. The default value is @code{1.0}.
+
+@item gamma_g
+Set the gamma value for green. It accepts a float value in range
+@code{0.1} to @code{10.0}. The default value is @code{1.0}.
+
+@item gamma_b
+Set the gamma value for blue. It accepts a float value in range
+@code{0.1} to @code{10.0}. The default value is @code{1.0}.
+
+@item gamma_weight
+Can be used to reduce the effect of a high gamma value on bright image areas,
+e.g. keep them from getting overamplified and just plain white. It accepts a
+float value in range @code{0.0} to @code{1.0}.A value of @code{0.0} turns the
+gamma correction all the way down while @code{1.0} leaves it at its full strength.
+Default is @code{1.0}.
+
+@end table
+
@section extractplanes
Extract color channel components from input video stream into
statistics is halved (i.e., it contributes only 0.5 to it's
classification). The default of 0 means that all frames seen are given
full weight of 1.0 forever.
+@item analyze_interlaced_flag
+When this is not 0 then idet will use the specified number of frames to determine
+if the interlaced flag is accurate, it will not count undetermined frames.
+If the flag is found to be accurate it will be used without any further
+computations, if it is found to be inaccuarte it will be cleared without any
+further computations. This allows inserting the idet filter as a low computational
+method to clean up the interlaced flag
@end table
@section il
The list of the currently supported filters follows:
@table @var
-@item eq2
-@item eq
-@item ilpack
-@item pp7
@item softpulldown
@end table
of the corresponding MPlayer filters. For detailed instructions check
the "VIDEO FILTERS" section in the MPlayer manual.
-@subsection Examples
-
-@itemize
-@item
-Adjust gamma, brightness, contrast:
-@example
-mp=eq2=1.0:2:0.5
-@end example
-@end itemize
-
See also mplayer(1), @url{http://www.mplayerhq.hu/}.
@section mpdecimate
@end example
@end itemize
+@section pp7
+Apply Postprocessing filter 7. It is variant of the @ref{spp} filter,
+similar to spp = 6 with 7 point DCT, where only the center sample is
+used after IDCT.
+
+The filter accepts the following options:
+
+@table @option
+@item qp
+Force a constant quantization parameter. It accepts an integer in range
+0 to 63. If not set, the filter will use the QP from the video stream
+(if available).
+
+@item mode
+Set thresholding mode. Available modes are:
+
+@table @samp
+@item hard
+Set hard thresholding.
+@item soft
+Set soft thresholding (better de-ringing effect, but likely blurrier).
+@item medium
+Set medium thresholding (good results, default).
+@end table
+@end table
+
@section psnr
Obtain the average, maximum and minimum PSNR (Peak Signal to Noise
ffmpeg -i input -vf pullup -r 24000/1001 ...
@end example
+@section qp
+
+Change video quantization parameters (QP).
+
+The filter accepts the following option:
+
+@table @option
+@item qp
+Set expression for quantization parameter.
+@end table
+
+The expression is evaluated through the eval API and can contain, among others,
+the following constants:
+
+@table @var
+@item known
+1 if index is not 129, 0 otherwise.
+
+@item qp
+Sequentional index starting from -129 to 128.
+@end table
+
+@subsection Examples
+
+@itemize
+@item
+Some equation like:
+@example
+qp=2+2*sin(PI*qp)
+@end example
+@end itemize
+
@section removelogo
Suppress a TV station logo, using an image file to determine which
expressed in the form "[@var{c0} @var{c1} @var{c2} @var{c3}]".
@end table
+@section showpalette
+
+Displays the 256 colors palette of each frame. This filter is only relevant for
+@var{pal8} pixel format frames.
+
+It accepts the following option:
+
+@table @option
+@item s
+Set the size of the box used to represent one palette color entry. Default is
+@code{30} (for a @code{30x30} pixel box).
+@end table
+
@section shuffleplanes
Reorder and/or duplicate video planes.
makes the spectrum having more range. Acceptable value is [1.0, 7.0].
Default value is @code{3.0}.
+@item gamma2
+Specify gamma of bargraph. Acceptable value is [1.0, 7.0].
+Default value is @code{1.0}.
+
@item fontfile
Specify font file for use with freetype. If not specified, use embedded font.
fontcolor='if(mod(floor(midi(f)+0.5),12), 0x0000FF, g(1))'
@end example
+@item
+Custom gamma, now spectrum is linear to the amplitude.
+@example
+gamma=2:gamma2=2
+@end example
+
@end itemize
@section showspectrum
projects / ffmpeg / blobdiff