Merge commit '928061670e873e816daa14827853b7e11221ff5f'

[ffmpeg] / doc / filters.texi

diff --git a/doc/filters.texi b/doc/filters.texi
index f14f6a9cdf672f5f18f865b5ca667bbe895559b3..154508cfff135d556d703d442ca2412350412c50 100644 (file)
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -6239,7 +6239,6 @@ The list of the currently supported filters follows:
 @item eq2
 @item eq
 @item ilpack
-@item pp7
 @item softpulldown
 @end table
 
@@ -7193,6 +7192,32 @@ pp=hb|y/vb|a
 @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
@@ -7326,6 +7351,38 @@ telecine NTSC input:
 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