@item width, w
Specify the band-width of a filter in width_type units.
+
+@item channels, c
+Specify which channels to filter, by default all available are filtered.
@end table
@section aloop
@item width, w
Specify the band-width of a filter in width_type units.
+
+@item channels, c
+Specify which channels to filter, by default all available are filtered.
@end table
@section bandreject
@item width, w
Specify the band-width of a filter in width_type units.
+
+@item channels, c
+Specify which channels to filter, by default all available are filtered.
@end table
@section bass
@item width, w
Determine how steep is the filter's shelf transition.
+
+@item channels, c
+Specify which channels to filter, by default all available are filtered.
@end table
@section biquad
Apply a biquad IIR filter with the given coefficients.
Where @var{b0}, @var{b1}, @var{b2} and @var{a0}, @var{a1}, @var{a2}
are the numerator and denominator coefficients respectively.
+and @var{channels}, @var{c} specify which channels to filter, by default all
+available are filtered.
@section bs2b
Bauer stereo to binaural transformation, which improves headphone listening of
@item gain, g
Set the required gain or attenuation in dB.
Beware of clipping when using a positive gain.
+
+@item channels, c
+Specify which channels to filter, by default all available are filtered.
@end table
@subsection Examples
Specify the band-width of a filter in width_type units.
Applies only to double-pole filter.
The default is 0.707q and gives a Butterworth response.
+
+@item channels, c
+Specify which channels to filter, by default all available are filtered.
@end table
@section join
Specify the band-width of a filter in width_type units.
Applies only to double-pole filter.
The default is 0.707q and gives a Butterworth response.
+
+@item channels, c
+Specify which channels to filter, by default all available are filtered.
@end table
+@subsection Examples
+@itemize
+@item
+Lowpass only LFE channel, it LFE is not present it does nothing:
+@example
+lowpass=c=LFE
+@end example
+@end itemize
+
@anchor{pan}
@section pan
@item width, w
Determine how steep is the filter's shelf transition.
+
+@item channels, c
+Specify which channels to filter, by default all available are filtered.
@end table
@section tremolo
If 0, plane will remain unchanged.
@end table
+@section deflicker
+
+Remove temporal frame luminance variations.
+
+It accepts the following options:
+
+@table @option
+@item size, s
+Set moving-average filter size in frames. Default is 5. Allowed range is 2 - 129.
+
+@item mode, m
+Set averaging mode to smooth temporal luminance variations.
+
+Available values are:
+@table @samp
+@item am
+Arithmetic mean
+
+@item gm
+Geometric mean
+
+@item hm
+Harmonic mean
+
+@item qm
+Quadratic mean
+
+@item cm
+Cubic mean
+
+@item pm
+Power mean
+
+@item median
+Median
+@end table
+@end table
+
@section dejudder
Remove judder produced by partially interlaced telecined content.
(tff - default) or odd (bff) lines of the progressive frame.
@item lowpass
-Enable (default) or disable the vertical lowpass filter to avoid twitter
-interlacing and reduce moire patterns.
+Vertical lowpass filter to avoid twitter interlacing and
+reduce moire patterns.
+
+@table @samp
+@item 0, off
+Disable vertical lowpass filter
+
+@item 1, linear
+Enable linear filter (default)
+
+@item 2, complex
+Enable complex filter. This will slightly less reduce twitter and moire
+but better retain detail and subjective sharpness impression.
+
+@end table
@end table
@section kerndeint
@end table
@end table
+@section lumakey
+
+Turn certain luma values into transparency.
+
+The filter accepts the following options:
+
+@table @option
+@item threshold
+Set the luma which will be used as base for transparency.
+Default value is @code{0}.
+
+@item tolerance
+Set the range of luma values to be keyed out.
+Default value is @code{0}.
+
+@item softness
+Set the range of softness. Default value is @code{0}.
+Use this to control gradual transition from zero to full transparency.
+@end table
+
@section lut, lutrgb, lutyuv
Compute a look-up table for binding each pixel component input value
These parameters correspond to the parameters assigned to the
libopencv function @code{cvSmooth}.
+@section oscilloscope
+
+2D Video Oscilloscope.
+
+Useful to measure spatial impulse, step responses, chroma delays, etc.
+
+It accepts the following parameters:
+
+@table @option
+@item x
+Set scope center x position.
+
+@item y
+Set scope center y position.
+
+@item s
+Set scope size, relative to frame diagonal.
+
+@item t
+Set scope tilt/rotation.
+
+@item o
+Set trace opacity.
+
+@item tx
+Set trace center x position.
+
+@item ty
+Set trace center y position.
+
+@item tw
+Set trace width, relative to width of frame.
+
+@item th
+Set trace height, relative to height of frame.
+
+@item c
+Set which components to trace. By default it traces first three components.
+
+@item g
+Draw trace grid. By default is enabled.
+
+@item st
+Draw some statistics. By default is enabled.
+
+@item sc
+Draw scope. By default is enabled.
+@end table
+
+@subsection Examples
+
+@itemize
+@item
+Inspect full first row of video frame.
+@example
+oscilloscope=x=0.5:y=0:s=1
+@end example
+
+@item
+Inspect full last row of video frame.
+@example
+oscilloscope=x=0.5:y=1:s=1
+@end example
+
+@item
+Inspect full 5th line of video frame of height 1080.
+@example
+oscilloscope=x=0.5:y=5/1080:s=1
+@end example
+
+@item
+Inspect full last column of video frame.
+@example
+oscilloscope=x=1:y=0.5:s=1:t=1
+@end example
+
+@end itemize
+
@anchor{overlay}
@section overlay
can be used to test the monowhite pixel format descriptor definition.
+@section pixscope
+
+Display sample values of color channels. Mainly useful for checking color and levels.
+
+The filters accept the following options:
+
+@table @option
+@item x
+Set scope X position, offset on X axis.
+
+@item y
+Set scope Y position, offset on Y axis.
+
+@item w
+Set scope width.
+
+@item h
+Set scope height.
+
+@item o
+Set window opacity. This window also holds statistics about pixel area.
+@end table
+
@section pp
Enable the specified chain of postprocessing subfilters using libpostproc. This
Both streams must have same dimensions and same pixel format.
+The filter accepts the following option:
+
+@table @option
+@item planes
+Set which planes will be processed, unprocessed planes will be copied.
+By default value 0xf, all planes will be processed.
+@end table
+
@section prewitt
Apply prewitt operator to input video stream.
@table @option
@item low_pass_filter, vlfp
-Enable vertical low-pass filtering in the filter.
+Enable linear vertical low-pass filtering in the filter.
Vertical low-pass filtering is required when creating an interlaced
destination from a progressive source which contains high-frequency
vertical detail. Filtering will reduce interlace 'twitter' and Moire
patterning.
+@item complex_filter, cvlfp
+Enable complex vertical low-pass filtering.
+This will slightly less reduce interlace 'twitter' and Moire
+patterning but better retain detail and subjective sharpness impression.
+
+@end table
+
Vertical low-pass filtering can only be enabled for @option{mode}
@var{interleave_top} and @var{interleave_bottom}.
-@end table
@end table
@section transpose
Set background opacity.
@end table
-@section weave
+@section weave, doubleweave
The @code{weave} takes a field-based video input and join
each two sequential fields into single frame, producing a new double
height clip with half the frame rate and half the frame count.
+The @code{doubleweave} works same as @code{weave} but without
+halving frame rate and frame count.
+
It accepts the following option:
@table @option
projects / ffmpeg / blobdiff