@end table
-@section blend
+@section blend, tblend
Blend two video frames into each other.
-It takes two input streams and outputs one stream, the first input is the
-"top" layer and second input is "bottom" layer.
-Output terminates when shortest input terminates.
+The @code{blend} filter takes two input streams and outputs one
+stream, the first input is the "top" layer and second input is
+"bottom" layer. Output terminates when shortest input terminates.
+
+The @code{tblend} (time blend) filter takes two consecutive frames
+from one single stream, and outputs the result obtained by blending
+the new frame on top of the old frame.
A description of the accepted options follows.
@item burn
@item darken
@item difference
+@item difference128
@item divide
@item dodge
@item exclusion
@end table
@item shortest
-Force termination when the shortest input terminates. Default is @code{0}.
+Force termination when the shortest input terminates. Default is
+@code{0}. This option is only defined for the @code{blend} filter.
+
@item repeatlast
Continue applying the last bottom frame after the end of the stream. A value of
@code{0} disable the filter after the last frame of the bottom layer is reached.
-Default is @code{1}.
+Default is @code{1}. This option is only defined for the @code{blend} filter.
@end table
@subsection Examples
@example
blend=all_expr='if(gte(T*SH*40+Y,H)*gte((T*40*SW+X)*W/H,W),A,B)'
@end example
+
+@item
+Display differences between the current and the previous frame:
+@example
+tblend=all_mode=difference128
+@end example
@end itemize
@section boxblur
@item limit
Set higher black value threshold, which can be optionally specified
-from nothing (0) to everything (255). An intensity value greater
-to the set value is considered non-black. It defaults to 24.
+from nothing (0) to everything (255 for 8bit based formats). An intensity
+value greater to the set value is considered non-black. It defaults to 24.
+You can also specify a value between 0.0 and 1.0 which will be scaled depending
+on the bitdepth of the pixel format.
@item round
The value which the width/height should be divisible by. It defaults to
For more information, see
@url{http://frei0r.dyne.org}
+@section fspp
+
+Apply fast and simple postprocessing. It is a faster version of @ref{spp}.
+
+It splits (I)DCT into horizontal/vertical passes. Unlike the simple post-
+processing filter, one of them is performed once per block, not per pixel.
+This allows for much higher speed.
+
+The filter accepts the following options:
+
+@table @option
+@item quality
+Set quality. This option defines the number of levels for averaging. It accepts
+an integer in the range 4-5. Default value is @code{4}.
+
+@item qp
+Force a constant quantization parameter. It accepts an integer in range 0-63.
+If not set, the filter will use the QP from the video stream (if available).
+
+@item strength
+Set filter strength. It accepts an integer in range -15 to 32. Lower values mean
+more details but also more artifacts, while higher values make the image smoother
+but also blurrier. Default value is @code{0} − PSNR optimal.
+
+@item use_bframe_qp
+Enable the use of the QP from the B-Frames if set to @code{1}. Using this
+option may cause flicker since the B-Frames have often larger QP. Default is
+@code{0} (not enabled).
+
+@end table
+
@section geq
The filter accepts the following options:
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
@table @var
@item eq2
@item eq
-@item fspp
@item ilpack
-@item pp7
@item softpulldown
@end table
@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
@end example
@end itemize
+@anchor{spp}
@section spp
Apply a simple postprocessing filter that compresses and decompresses the image
projects / ffmpeg / blobdiff