@chapter Audio Filters
@c man begin AUDIO FILTERS
-When you configure your Libav build, you can disable any of the
+When you configure your FFmpeg build, you can disable any of the
existing filters using --disable-filters.
The configure output will show the audio filters included in your
build.
@chapter Video Filters
@c man begin VIDEO FILTERS
-When you configure your Libav build, you can disable any of the
+When you configure your FFmpeg build, you can disable any of the
existing filters using --disable-filters.
The configure output will show the video filters included in your
build.
Apply a frei0r effect to the input video.
To enable compilation of this filter you need to install the frei0r
-header and configure Libav with --enable-frei0r.
+header and configure FFmpeg with --enable-frei0r.
The filter supports the syntax:
@example
@var{luma_tmp}*@var{chroma_spatial}/@var{luma_spatial}
@end table
+@section mp
+
+Apply an MPlayer filter to the input video.
+
+This filter provides a wrapper around most of the filters of
+MPlayer/MEncoder.
+
+This wrapper is considered experimental. Some of the wrapped filters
+may not work properly and we may drop support for them, as they will
+be implemented natively into FFmpeg. Thus you should avoid
+depending on them when writing portable scripts.
+
+The filters accepts the parameters:
+@var{filter_name}[:=]@var{filter_params}
+
+@var{filter_name} is the name of a supported MPlayer filter,
+@var{filter_params} is a string containing the parameters accepted by
+the named filter.
+
+The list of the currently supported filters follows:
+@table @var
+@item 2xsai
+@item blackframe
+@item boxblur
+@item cropdetect
+@item decimate
+@item delogo
+@item denoise3d
+@item detc
+@item dint
+@item divtc
+@item down3dright
+@item dsize
+@item eq2
+@item eq
+@item field
+@item fil
+@item fixpts
+@item framestep
+@item fspp
+@item geq
+@item gradfun
+@item harddup
+@item hqdn3d
+@item hue
+@item il
+@item ilpack
+@item ivtc
+@item kerndeint
+@item mcdeint
+@item mirror
+@item noise
+@item ow
+@item palette
+@item perspective
+@item phase
+@item pp7
+@item pullup
+@item qp
+@item rectangle
+@item remove-logo
+@item rgbtest
+@item rotate
+@item sab
+@item screenshot
+@item smartblur
+@item softpulldown
+@item softskip
+@item spp
+@item swapuv
+@item telecine
+@item test
+@item tile
+@item tinterlace
+@item unsharp
+@item uspp
+@item yuvcsp
+@item yvu9
+@end table
+
+The parameter syntax and behavior for the listed filters are the same
+of the corresponding MPlayer filters. For detailed instructions check
+the "VIDEO FILTERS" section in the MPlayer manual.
+
+Some examples follow:
+@example
+# remove a logo by interpolating the surrounding pixels
+mp=delogo=200:200:80:20:1
+
+# adjust gamma, brightness, contrast
+mp=eq2=1.0:2:0.5
+
+# tweak hue and saturation
+mp=hue=100:-10
+@end example
+
+See also mplayer(1), @url{http://www.mplayerhq.hu/}.
+
@section noformat
Force libavfilter not to use any of the specified pixel formats for the
Apply video transform using libopencv.
To enable this filter install libopencv library and headers and
-configure Libav with --enable-libopencv.
+configure FFmpeg with --enable-libopencv.
The filter takes the parameters: @var{filter_name}@{:=@}@var{filter_params}.
scale='min(500\, iw*3/2):-1'
@end example
+@section select
+Select frames to pass in output.
+
+It accepts in input an expression, which is evaluated for each input
+frame. If the expression is evaluated to a non-zero value, the frame
+is selected and passed to the output, otherwise it is discarded.
+
+The expression can contain the following constants:
+
+@table @option
+@item PI
+Greek PI
+
+@item PHI
+golden ratio
+
+@item E
+Euler number
+
+@item n
+the sequential number of the filtered frame, starting from 0
+
+@item selected_n
+the sequential number of the selected frame, starting from 0
+
+@item prev_selected_n
+the sequential number of the last selected frame, NAN if undefined
+
+@item TB
+timebase of the input timestamps
+
+@item pts
+the PTS (Presentation TimeStamp) of the filtered video frame,
+expressed in @var{TB} units, NAN if undefined
+
+@item t
+the PTS (Presentation TimeStamp) of the filtered video frame,
+expressed in seconds, NAN if undefined
+
+@item prev_pts
+the PTS of the previously filtered video frame, NAN if undefined
+
+@item prev_selected_pts
+the PTS of the last previously filtered video frame, NAN if undefined
+
+@item prev_selected_t
+the PTS of the last previously selected video frame, NAN if undefined
+
+@item start_pts
+the PTS of the first video frame in the video, NAN if undefined
+
+@item start_t
+the time of the first video frame in the video, NAN if undefined
+
+@item pict_type
+the picture type of the filtered frame, can assume one of the following
+values:
+@table @option
+@item PICT_TYPE_I
+@item PICT_TYPE_P
+@item PICT_TYPE_B
+@item PICT_TYPE_S
+@item PICT_TYPE_SI
+@item PICT_TYPE_SP
+@item PICT_TYPE_BI
+@end table
+
+@item interlace_type
+the frame interlace type, can assume one of the following values:
+@table @option
+@item INTERLACE_TYPE_P
+the frame is progressive (not interlaced)
+@item INTERLACE_TYPE_T
+the frame is top-field-first
+@item INTERLACE_TYPE_B
+the frame is bottom-field-first
+@end table
+
+@item key
+1 if the filtered frame is a key-frame, 0 otherwise
+
+@item pos
+the position in the file of the filtered frame, -1 if the information
+is not available (e.g. for synthetic video)
+@end table
+
+The default value of the select expression is "1".
+
+Some examples follow:
+
+@example
+# select all frames in input
+select
+
+# the above is the same as:
+select=1
+
+# skip all frames:
+select=0
+
+# select only I-frames
+select='eq(pict_type\,PICT_TYPE_I)'
+
+# select one frame every 100
+select='not(mod(n\,100))'
+
+# select only frames contained in the 10-20 time interval
+select='gte(t\,10)*lte(t\,20)'
+
+# select only I frames contained in the 10-20 time interval
+select='gte(t\,10)*lte(t\,20)*eq(pict_type\,PICT_TYPE_I)'
+
+# select frames with a minimum distance of 10 seconds
+select='isnan(prev_selected_t)+gte(t-prev_selected_t\,10)'
+@end example
+
@anchor{setdar}
@section setdar
settb=AVTB
@end example
+@section showinfo
+
+Show a line containing various information for each input video frame.
+The input video is not modified.
+
+The shown line contains a sequence of key/value pairs of the form
+@var{key}:@var{value}.
+
+A description of each shown parameter follows:
+
+@table @option
+@item n
+sequential number of the input frame, starting from 0
+
+@item pts
+Presentation TimeStamp of the input frame, expressed as a number of
+time base units. The time base unit depends on the filter input pad.
+
+@item pts_time
+Presentation TimeStamp of the input frame, expressed as a number of
+seconds
+
+@item pos
+position of the frame in the input stream, -1 if this information in
+unavailable and/or meanigless (for example in case of synthetic video)
+
+@item fmt
+pixel format name
+
+@item sar
+sample aspect ratio of the input frame, expressed in the form
+@var{num}/@var{den}
+
+@item s
+size of the input frame, expressed in the form
+@var{width}x@var{height}
+
+@item i
+interlaced mode ("P" for "progressive", "T" for top field first, "B"
+for bottom field first)
+
+@item iskey
+1 if the frame is a key frame, 0 otherwise
+
+@item type
+picture type of the input frame ("I" for an I-frame, "P" for a
+P-frame, "B" for a B-frame, "?" for unknown type).
+Check also the documentation of the @code{AVPictureType} enum and of
+the @code{av_get_picture_type_char} function defined in
+@file{libavutil/avutil.h}.
+
+@item checksum
+Adler-32 checksum of all the planes of the input frame
+
+@item plane_checksum
+Adler-32 checksum of each plane of the input frame, expressed in the form
+"[@var{c0} @var{c1} @var{c2} @var{c3}]"
+@end table
+
@section slicify
Pass the images of input video on to next video filter as multiple
Adding this in the beginning of filter chains should make filtering
faster due to better use of the memory cache.
+@section split
+
+Pass on the input video to two outputs. Both outputs are identical to
+the input video.
+
+For example:
+@example
+[in] split [splitout1][splitout2];
+[splitout1] crop=100:100:0:0 [cropout];
+[splitout2] pad=200:200:100:100 [padout];
+@end example
+
+will create two separate outputs from the same input, one cropped and
+one padded.
+
@section transpose
Transpose rows with columns in the input video and optionally flip it.
through the interface defined in @file{libavfilter/vsrc_buffer.h}.
It accepts the following parameters:
-@var{width}:@var{height}:@var{pix_fmt_string}:@var{timebase_num}:@var{timebase_den}:@var{sample_aspect_ratio_num}:@var{sample_aspect_ratio.den}
+@var{width}:@var{height}:@var{pix_fmt_string}:@var{timebase_num}:@var{timebase_den}:@var{sample_aspect_ratio_num}:@var{sample_aspect_ratio.den}:@var{scale_params}
-All the parameters need to be explicitely defined.
+All the parameters but @var{scale_params} need to be explicitely
+defined.
Follows the list of the accepted parameters.
@item sample_aspect_ratio.num, sample_aspect_ratio.den
Specify numerator and denominator of the sample aspect ratio assumed
by the video frames.
+
+@item scale_params
+Specify the optional parameters to be used for the scale filter which
+is automatically inserted when an input change is detected in the
+input size or format.
@end table
For example:
(check the enum PixelFormat definition in @file{libavutil/pixfmt.h}),
this example corresponds to:
@example
-buffer=320:240:6:1:24
+buffer=320:240:6:1:24:1:1
@end example
@section color
Provide a frei0r source.
To enable compilation of this filter you need to install the frei0r
-header and configure Libav with --enable-frei0r.
+header and configure FFmpeg with --enable-frei0r.
The source supports the syntax:
@example
projects / ffmpeg / blobdiff