Below is a description of the currently available audio filters.
+@section aconvert
+
+Convert the input audio format to the specified formats.
+
+The filter accepts a string of the form:
+"@var{sample_format}:@var{channel_layout}:@var{packing_format}".
+
+@var{sample_format} specifies the sample format, and can be a string or
+the corresponding numeric value defined in @file{libavutil/samplefmt.h}.
+
+@var{channel_layout} specifies the channel layout, and can be a string
+or the corresponding number value defined in @file{libavutil/chlayout.h}.
+
+@var{packing_format} specifies the type of packing in output, can be one
+of "planar" or "packed", or the corresponding numeric values "0" or "1".
+
+The special parameter "auto", signifies that the filter will
+automatically select the output format depending on the output filter.
+
+Some examples follow.
+
+@itemize
+@item
+Convert input to unsigned 8-bit, stereo, packed:
+@example
+aconvert=u8:stereo:packed
+@end example
+
+@item
+Convert input to unsigned 8-bit, automatically select out channel layout
+and packing format:
+@example
+aconvert=u8:auto:auto
+@end example
+@end itemize
+
@section aformat
Convert the input audio to one of the specified formats. The framework will
aresample=44100
@end example
+@section ashowinfo
+
+Show a line containing various information for each input audio frame.
+The input audio 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, and
+is usually 1/@var{sample_rate}.
+
+@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 audio)
+
+@item fmt
+sample format name
+
+@item chlayout
+channel layout description
+
+@item nb_samples
+number of samples (per each channel) contained in the filtered frame
+
+@item rate
+sample rate for the audio frame
+
+@item planar
+if the packing format is planar, 0 if packed
+
+@item checksum
+Adler-32 checksum of all the planes of the input frame
+
+@item plane_checksum
+Adler-32 checksum for each input frame plane, expressed in the form
+"[@var{c0} @var{c1} @var{c2} @var{c3} @var{c4} @var{c5} @var{c6} @var{c7}]"
+@end table
+
@c man end AUDIO FILTERS
@chapter Audio Sources
Below is a description of the currently available audio sources.
+@section abuffer
+
+Buffer audio frames, and make them available to the filter chain.
+
+This source is mainly intended for a programmatic use, in particular
+through the interface defined in @file{libavfilter/asrc_abuffer.h}.
+
+It accepts the following mandatory parameters:
+@var{sample_rate}:@var{sample_fmt}:@var{channel_layout}:@var{packing}
+
+@table @option
+
+@item sample_rate
+The sample rate of the incoming audio buffers.
+
+@item sample_fmt
+The sample format of the incoming audio buffers.
+Either a sample format name or its corresponging integer representation from
+the enum AVSampleFormat in @file{libavutil/samplefmt.h}
+
+@item channel_layout
+The channel layout of the incoming audio buffers.
+Either a channel layout name from channel_layout_map in
+@file{libavutil/audioconvert.c} or its corresponding integer representation
+from the AV_CH_LAYOUT_* macros in @file{libavutil/audioconvert.h}
+
+@item packing
+Either "packed" or "planar", or their integer representation: 0 or 1
+respectively.
+
+@end table
+
+For example:
+@example
+abuffer=44100:s16:stereo:planar
+@end example
+
+will instruct the source to accept planar 16bit signed stereo at 44100Hz.
+Since the sample format with name "s16" corresponds to the number
+1 and the "stereo" channel layout corresponds to the value 3, this is
+equivalent to:
+@example
+abuffer=44100:1:3:1
+@end example
+
+@section amovie
+
+Read an audio stream from a movie container.
+
+It accepts the syntax: @var{movie_name}[:@var{options}] where
+@var{movie_name} is the name of the resource to read (not necessarily
+a file but also a device or a stream accessed through some protocol),
+and @var{options} is an optional sequence of @var{key}=@var{value}
+pairs, separated by ":".
+
+The description of the accepted options follows.
+
+@table @option
+
+@item format_name, f
+Specify the format assumed for the movie to read, and can be either
+the name of a container or an input device. If not specified the
+format is guessed from @var{movie_name} or by probing.
+
+@item seek_point, sp
+Specify the seek point in seconds, the frames will be output
+starting from this seek point, the parameter is evaluated with
+@code{av_strtod} so the numerical value may be suffixed by an IS
+postfix. Default value is "0".
+
+@item stream_index, si
+Specify the index of the audio stream to read. If the value is -1,
+the best suited audio stream will be automatically selected. Default
+value is "-1".
+
+@end table
+
@section anullsrc
-Null audio source, never return audio frames. It is mainly useful as a
-template and to be employed in analysis / debugging tools.
+Null audio source, return unprocessed audio frames. It is mainly useful
+as a template and to be employed in analysis / debugging tools, or as
+the source for filters which ignore the input data (for example the sox
+synth filter).
-It accepts as optional parameter a string of the form
-@var{sample_rate}:@var{channel_layout}.
+It accepts an optional sequence of @var{key}=@var{value} pairs,
+separated by ":".
+
+The description of the accepted options follows.
+
+@table @option
+
+@item sample_rate, s
+Specify the sample rate, and defaults to 44100.
-@var{sample_rate} specify the sample rate, and defaults to 44100.
+@item channel_layout, cl
-@var{channel_layout} specify the channel layout, and can be either an
-integer or a string representing a channel layout. The default value
-of @var{channel_layout} is 3, which corresponds to CH_LAYOUT_STEREO.
+Specify the channel layout, and can be either an integer or a string
+representing a channel layout. The default value of @var{channel_layout}
+is "stereo".
Check the channel_layout_map definition in
@file{libavcodec/audioconvert.c} for the mapping between strings and
channel layout values.
+@item nb_samples, n
+Set the number of samples per requested frames.
+
+@end table
+
Follow some examples:
@example
-# set the sample rate to 48000 Hz and the channel layout to CH_LAYOUT_MONO.
-anullsrc=48000:4
+# set the sample rate to 48000 Hz and the channel layout to AV_CH_LAYOUT_MONO.
+anullsrc=r=48000:cl=4
# same as
-anullsrc=48000:mono
+anullsrc=r=48000:cl=mono
@end example
@c man end AUDIO SOURCES
Buffer audio frames, and make them available to the end of filter chain.
This sink is mainly intended for programmatic use, in particular
-through the interface defined in @file{libavfilter/asink_abuffer.h}.
+through the interface defined in @file{libavfilter/buffersink.h}.
-It requires a pointer to a ABufferSinkContext structure, which defines the
-incoming buffers' format, to be passed as the opaque parameter to
-@code{avfilter_init_filter} for initialization.
+It requires a pointer to an AVABufferSinkContext structure, which
+defines the incoming buffers' formats, to be passed as the opaque
+parameter to @code{avfilter_init_filter} for initialization.
@section anullsink
Apply boxblur algorithm to the input video.
This filter accepts the parameters:
-@var{luma_power}:@var{luma_radius}:@var{chroma_radius}:@var{chroma_power}:@var{alpha_radius}:@var{alpha_power}
+@var{luma_radius}:@var{luma_power}:@var{chroma_radius}:@var{chroma_power}:@var{alpha_radius}:@var{alpha_power}
Chroma and alpha parameters are optional, if not specified they default
to the corresponding values set for @var{luma_radius} and
each new frame.
@item in_w, in_h
-the input width and heigth
+the input width and height
@item iw, ih
same as @var{in_w} and @var{in_h}
@item out_w, out_h
-the output (cropped) width and heigth
+the output (cropped) width and height
@item ow, oh
same as @var{out_w} and @var{out_h}
If both text and textfile are specified, an error is thrown.
@item x, y
-The offsets where text will be drawn within the video frame.
-Relative to the top/left border of the output image.
+The expressions which specify the offsets where text will be drawn
+within the video frame. They are relative to the top/left border of the
+output image.
-The default value of @var{x} and @var{y} is 0.
+The default value of @var{x} and @var{y} is "0".
+
+See below for the list of accepted constants.
@item fontsize
The font size to be used for drawing text.
Default value is 4.
@end table
-For example the command:
+The parameters for @var{x} and @var{y} are expressions containing the
+following constants:
+
+@table @option
+@item E, PI, PHI
+the corresponding mathematical approximated values for e
+(euler number), pi (greek PI), PHI (golden ratio)
+
+@item w, h
+the input width and heigth
+
+@item tw, text_w
+the width of the rendered text
+
+@item th, text_h
+the height of the rendered text
+
+@item lh, line_h
+the height of each text line
+
+@item sar
+input sample aspect ratio
+
+@item dar
+input display aspect ratio, it is the same as (@var{w} / @var{h}) * @var{sar}
+
+@item hsub, vsub
+horizontal and vertical chroma subsample values. For example for the
+pixel format "yuv422p" @var{hsub} is 2 and @var{vsub} is 1.
+
+@item max_glyph_w
+maximum glyph width, that is the maximum width for all the glyphs
+contained in the rendered text
+
+@item max_glyph_h
+maximum glyph height, that is the maximum height for all the glyphs
+contained in the rendered text, it is equivalent to @var{ascent} -
+@var{descent}.
+
+@item max_glyph_a, ascent
+
+the maximum distance from the baseline to the highest/upper grid
+coordinate used to place a glyph outline point, for all the rendered
+glyphs.
+It is a positive value, due to the grid's orientation with the Y axis
+upwards.
+
+@item max_glyph_d, descent
+the maximum distance from the baseline to the lowest grid coordinate
+used to place a glyph outline point, for all the rendered glyphs.
+This is a negative value, due to the grid's orientation, with the Y axis
+upwards.
+
+@item n
+the number of input frame, starting from 0
+
+@item t
+timestamp expressed in seconds, NAN if the input timestamp is unknown
+@end table
+
+Some examples follow.
+
+@itemize
+
+@item
+Draw "Test Text" with font FreeSerif, using the default values for the
+optional parameters.
+
@example
drawtext="fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: text='Test Text'"
@end example
-will draw "Test Text" with font FreeSerif, using the default values
-for the optional parameters.
+@item
+Draw 'Test Text' with font FreeSerif of size 24 at position x=100
+and y=50 (counting from the top-left corner of the screen), text is
+yellow with a red box around it. Both the text and the box have an
+opacity of 20%.
-The command:
@example
drawtext="fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: text='Test Text':\
x=100: y=50: fontsize=24: fontcolor=yellow@@0.2: box=1: boxcolor=red@@0.2"
@end example
-will draw 'Test Text' with font FreeSerif of size 24 at position x=100
-and y=50 (counting from the top-left corner of the screen), text is
-yellow with a red box around it. Both the text and the box have an
-opacity of 20%.
-
Note that the double quotes are not necessary if spaces are not used
within the parameter list.
+@item
+Show the text at the center of the video frame:
+@example
+drawtext=fontsize=30:fontfile=FreeSerif.ttf:text='hello world':x=(w-text_w)/2:y=(h-text_h-line_h)/2"
+@end example
+
+@item
+Show a text line sliding from right to left in the last row of the video
+frame. The file @file{LONG_LINE} is assumed to contain a single line
+with no newlines.
+@example
+drawtext=fontsize=15:fontfile=FreeSerif.ttf:text=LONG_LINE:y=h-line_h:x=-50*t
+@end example
+
+@item
+Show the content of file @file{CREDITS} off the bottom of the frame and scroll up.
+@example
+drawtext=fontsize=20:fontfile=FreeSerif.ttf:textfile=CREDITS:y=h-20*t"
+@end example
+
+@item
+Draw a single green letter "g", at the center of the input video.
+The glyph baseline is placed at half screen height.
+@example
+drawtext=fontsize=60:fontfile=FreeSerif.ttf:fontcolor=green:text=g:x=(w-max_glyph_w)/2:y=h/2-ascent
+@end example
+
+@end itemize
+
For more information about libfreetype, check:
@url{http://www.freetype.org/}.
The @var{lut} filter requires either YUV or RGB pixel formats in
input, and accepts the options:
@table @option
-@var{c0} (first pixel component)
-@var{c1} (second pixel component)
-@var{c2} (third pixel component)
-@var{c3} (fourth pixel component, corresponds to the alpha component)
+@item c0
+first pixel component
+@item c1
+second pixel component
+@item c2
+third pixel component
+@item c3
+fourth pixel component, corresponds to the alpha component
@end table
The exact component associated to each option depends on the format in
The @var{lutrgb} filter requires RGB pixel formats in input, and
accepts the options:
@table @option
-@var{r} (red component)
-@var{g} (green component)
-@var{b} (blue component)
-@var{a} (alpha component)
+@item r
+red component
+@item g
+green component
+@item b
+blue component
+@item a
+alpha component
@end table
The @var{lutyuv} filter requires YUV pixel formats in input, and
accepts the options:
@table @option
-@var{y} (Y/luminance component)
-@var{u} (U/Cb component)
-@var{v} (V/Cr component)
-@var{a} (alpha component)
+@item y
+Y/luminance component
+@item u
+U/Cb component
+@item v
+V/Cr component
+@item a
+alpha component
@end table
The expressions can contain the following constants and functions:
lutyuv="y=negval:u=negval:v=negval"
# negate luminance
-lutyuv=negval
+lutyuv=y=negval
# remove chroma components, turns the video into a graytone image
lutyuv="u=128:v=128"
(euler number), pi (greek PI), phi (golden ratio)
@item in_w, in_h
-the input video width and heigth
+the input video width and height
@item iw, ih
same as @var{in_w} and @var{in_h}
@item out_w, out_h
-the output width and heigth, that is the size of the padded area as
+the output width and height, that is the size of the padded area as
specified by the @var{width} and @var{height} expressions
@item ow, oh
(euler number), pi (greek PI), phi (golden ratio)
@item in_w, in_h
-the input width and heigth
+the input width and height
@item iw, ih
same as @var{in_w} and @var{in_h}
@item out_w, out_h
-the output (cropped) width and heigth
+the output (cropped) width and height
@item ow, oh
same as @var{out_w} and @var{out_h}
@item dar
input display aspect ratio, it is the same as (@var{iw} / @var{ih}) * @var{sar}
+@item sar
+input sample aspect ratio
+
@item hsub, vsub
horizontal and vertical chroma subsample values. For example for the
pixel format "yuv422p" @var{hsub} is 2 and @var{vsub} is 1.
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
+the 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
+@item I
+@item P
+@item B
+@item S
+@item SI
+@item SP
+@item BI
@end table
@item interlace_type
the frame interlace type, can assume one of the following values:
@table @option
-@item INTERLACE_TYPE_P
+@item PROGRESSIVE
the frame is progressive (not interlaced)
-@item INTERLACE_TYPE_T
+@item TOPFIRST
the frame is top-field-first
-@item INTERLACE_TYPE_B
+@item BOTTOMFIRST
the frame is bottom-field-first
@end table
select=0
# select only I-frames
-select='eq(pict_type\,PICT_TYPE_I)'
+select='eq(pict_type\,I)'
# select one frame every 100
select='not(mod(n\,100))'
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='gte(t\,10)*lte(t\,20)*eq(pict_type\,I)'
# select frames with a minimum distance of 10 seconds
select='isnan(prev_selected_t)+gte(t-prev_selected_t\,10)'
@item frame_size
Specify the size of the sourced video, it may be a string of the form
-@var{width}x@var{heigth}, or the name of a size abbreviation. The
+@var{width}x@var{height}, or the name of a size abbreviation. The
default value is "320x240".
@item frame_rate
number or a valid video frame rate abbreviation. The default value is
"25".
+@item sar
+Set the sample aspect ratio of the sourced video.
+
@item duration
Set the video duration of the sourced video. The accepted syntax is:
@example
graph.
This sink is mainly intended for a programmatic use, in particular
-through the interface defined in @file{libavfilter/vsink_buffer.h}.
+through the interface defined in @file{libavfilter/buffersink.h}.
It does not require a string parameter in input, but you need to
specify a pointer to a list of supported pixel formats terminated by
projects / ffmpeg / blobdiff