mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
716 lines
19 KiB
Plaintext
716 lines
19 KiB
Plaintext
@chapter Audio Filters
|
|
@c man begin AUDIO FILTERS
|
|
|
|
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.
|
|
|
|
Below is a description of the currently available audio filters.
|
|
|
|
@section anull
|
|
|
|
Pass the audio source unchanged to the output.
|
|
|
|
@c man end AUDIO FILTERS
|
|
|
|
@chapter Audio Sources
|
|
@c man begin AUDIO SOURCES
|
|
|
|
Below is a description of the currently available audio sources.
|
|
|
|
@section anullsrc
|
|
|
|
Null audio source, never return audio frames. It is mainly useful as a
|
|
template and to be employed in analysis / debugging tools.
|
|
|
|
It accepts as optional parameter a string of the form
|
|
@var{sample_rate}:@var{channel_layout}.
|
|
|
|
@var{sample_rate} specify the sample rate, and defaults to 44100.
|
|
|
|
@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.
|
|
|
|
Check the channel_layout_map definition in
|
|
@file{libavcodec/audioconvert.c} for the mapping between strings and
|
|
channel layout values.
|
|
|
|
Follow some examples:
|
|
@example
|
|
# set the sample rate to 48000 Hz and the channel layout to CH_LAYOUT_MONO.
|
|
anullsrc=48000:4
|
|
|
|
# same as
|
|
anullsrc=48000:mono
|
|
@end example
|
|
|
|
@c man end AUDIO SOURCES
|
|
|
|
@chapter Audio Sinks
|
|
@c man begin AUDIO SINKS
|
|
|
|
Below is a description of the currently available audio sinks.
|
|
|
|
@section anullsink
|
|
|
|
Null audio sink, do absolutely nothing with the input audio. It is
|
|
mainly useful as a template and to be employed in analysis / debugging
|
|
tools.
|
|
|
|
@c man end AUDIO SINKS
|
|
|
|
@chapter Video Filters
|
|
@c man begin VIDEO FILTERS
|
|
|
|
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.
|
|
|
|
Below is a description of the currently available video filters.
|
|
|
|
@section blackframe
|
|
|
|
Detect frames that are (almost) completely black. Can be useful to
|
|
detect chapter transitions or commercials. Output lines consist of
|
|
the frame number of the detected frame, the percentage of blackness,
|
|
the position in the file if known or -1 and the timestamp in seconds.
|
|
|
|
In order to display the output lines, you need to set the loglevel at
|
|
least to the AV_LOG_INFO value.
|
|
|
|
The filter accepts the syntax:
|
|
@example
|
|
blackframe[=@var{amount}:[@var{threshold}]]
|
|
@end example
|
|
|
|
@var{amount} is the percentage of the pixels that have to be below the
|
|
threshold, and defaults to 98.
|
|
|
|
@var{threshold} is the threshold below which a pixel value is
|
|
considered black, and defaults to 32.
|
|
|
|
@section crop
|
|
|
|
Crop the input video to @var{out_w}:@var{out_h}:@var{x}:@var{y}.
|
|
|
|
The parameters 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 x, y
|
|
the computed values for @var{x} and @var{y}. They are evaluated for
|
|
each new frame.
|
|
|
|
@item in_w, in_h
|
|
the input width and heigth
|
|
|
|
@item iw, ih
|
|
same as @var{in_w} and @var{in_h}
|
|
|
|
@item out_w, out_h
|
|
the output (cropped) width and heigth
|
|
|
|
@item ow, oh
|
|
same as @var{out_w} and @var{out_h}
|
|
|
|
@item n
|
|
the number of input frame, starting from 0
|
|
|
|
@item pos
|
|
the position in the file of the input frame, NAN if unknown
|
|
|
|
@item t
|
|
timestamp expressed in seconds, NAN if the input timestamp is unknown
|
|
|
|
@end table
|
|
|
|
The @var{out_w} and @var{out_h} parameters specify the expressions for
|
|
the width and height of the output (cropped) video. They are
|
|
evaluated just at the configuration of the filter.
|
|
|
|
The default value of @var{out_w} is "in_w", and the default value of
|
|
@var{out_h} is "in_h".
|
|
|
|
The expression for @var{out_w} may depend on the value of @var{out_h},
|
|
and the expression for @var{out_h} may depend on @var{out_w}, but they
|
|
cannot depend on @var{x} and @var{y}, as @var{x} and @var{y} are
|
|
evaluated after @var{out_w} and @var{out_h}.
|
|
|
|
The @var{x} and @var{y} parameters specify the expressions for the
|
|
position of the top-left corner of the output (non-cropped) area. They
|
|
are evaluated for each frame. If the evaluated value is not valid, it
|
|
is approximated to the nearest valid value.
|
|
|
|
The default value of @var{x} is "(in_w-out_w)/2", and the default
|
|
value for @var{y} is "(in_h-out_h)/2", which set the cropped area at
|
|
the center of the input image.
|
|
|
|
The expression for @var{x} may depend on @var{y}, and the expression
|
|
for @var{y} may depend on @var{x}.
|
|
|
|
Follow some examples:
|
|
@example
|
|
# crop the central input area with size 100x100
|
|
crop=100:100
|
|
|
|
# crop the central input area with size 2/3 of the input video
|
|
"crop=2/3*in_w:2/3*in_h"
|
|
|
|
# crop the input video central square
|
|
crop=in_h
|
|
|
|
# delimit the rectangle with the top-left corner placed at position
|
|
# 100:100 and the right-bottom corner corresponding to the right-bottom
|
|
# corner of the input image.
|
|
crop=in_w-100:in_h-100:100:100
|
|
|
|
# crop 10 pixels from the lefth and right borders, and 20 pixels from
|
|
# the top and bottom borders
|
|
"crop=in_w-2*10:in_h-2*20"
|
|
|
|
# keep only the bottom right quarter of the input image
|
|
"crop=in_w/2:in_h/2:in_w/2:in_h/2"
|
|
|
|
# crop height for getting Greek harmony
|
|
"crop=in_w:1/PHI*in_w"
|
|
|
|
# trembling effect
|
|
"crop=in_w/2:in_h/2:(in_w-out_w)/2+((in_w-out_w)/2)*sin(n/10):(in_h-out_h)/2 +((in_h-out_h)/2)*sin(n/7)"
|
|
|
|
# erratic camera effect depending on timestamp and position
|
|
"crop=in_w/2:in_h/2:(in_w-out_w)/2+((in_w-out_w)/2)*sin(t*10):(in_h-out_h)/2 +((in_h-out_h)/2)*sin(t*13)"
|
|
|
|
# set x depending on the value of y
|
|
"crop=in_w/2:in_h/2:y:10+10*sin(n/10)"
|
|
@end example
|
|
|
|
@section cropdetect
|
|
|
|
Auto-detect crop size.
|
|
|
|
Calculate necessary cropping parameters and prints the recommended
|
|
parameters through the logging system. The detected dimensions
|
|
correspond to the non-black area of the input video.
|
|
|
|
It accepts the syntax:
|
|
@example
|
|
cropdetect[=@var{limit}:@var{round}[:@var{reset}]]
|
|
@end example
|
|
|
|
@table @option
|
|
|
|
@item limit
|
|
Threshold, which can be optionally specified from nothing (0) to
|
|
everything (255), defaults to 24.
|
|
|
|
@item round
|
|
Value which the width/height should be divisible by, defaults to
|
|
16. The offset is automatically adjusted to center the video. Use 2 to
|
|
get only even dimensions (needed for 4:2:2 video). 16 is best when
|
|
encoding to most video codecs.
|
|
|
|
@item reset
|
|
Counter that determines after how many frames cropdetect will reset
|
|
the previously detected largest video area and start over to detect
|
|
the current optimal crop area. Defaults to 0.
|
|
|
|
This can be useful when channel logos distort the video area. 0
|
|
indicates never reset and return the largest area encountered during
|
|
playback.
|
|
@end table
|
|
|
|
@section drawbox
|
|
|
|
Draw a colored box on the input image.
|
|
|
|
It accepts the syntax:
|
|
@example
|
|
drawbox=@var{x}:@var{y}:@var{width}:@var{height}:@var{color}
|
|
@end example
|
|
|
|
@table @option
|
|
|
|
@item x, y
|
|
Specify the top left corner coordinates of the box. Default to 0.
|
|
|
|
@item width, height
|
|
Specify the width and height of the box, if 0 they are interpreted as
|
|
the input width and height. Default to 0.
|
|
|
|
@item color
|
|
Specify the color of the box to write, it can be the name of a color
|
|
(case insensitive match) or a 0xRRGGBB[AA] sequence.
|
|
@end table
|
|
|
|
Follow some examples:
|
|
@example
|
|
# draw a black box around the edge of the input image
|
|
drawbox
|
|
|
|
# draw a box with color red and an opacity of 50%
|
|
drawbox=10:20:200:60:red@@0.5"
|
|
@end example
|
|
|
|
@section fifo
|
|
|
|
Buffer input images and send them when they are requested.
|
|
|
|
This filter is mainly useful when auto-inserted by the libavfilter
|
|
framework.
|
|
|
|
The filter does not take parameters.
|
|
|
|
@section format
|
|
|
|
Convert the input video to one of the specified pixel formats.
|
|
Libavfilter will try to pick one that is supported for the input to
|
|
the next filter.
|
|
|
|
The filter accepts a list of pixel format names, separated by ":",
|
|
for example "yuv420p:monow:rgb24".
|
|
|
|
The following command:
|
|
|
|
@example
|
|
./ffmpeg -i in.avi -vf "format=yuv420p" out.avi
|
|
@end example
|
|
|
|
will convert the input video to the format "yuv420p".
|
|
|
|
@section frei0r
|
|
|
|
Apply a frei0r effect to the input video.
|
|
|
|
To enable compilation of this filter you need to install the frei0r
|
|
header and configure FFmpeg with --enable-frei0r.
|
|
|
|
The filter supports the syntax:
|
|
@example
|
|
@var{filter_name}:@var{param1}:@var{param2}:...:@var{paramN}
|
|
@end example
|
|
|
|
@var{filter_name} is the name to the frei0r effect to load. If the
|
|
environment variable @env{FREI0R_PATH} is defined, the frei0r effect
|
|
is searched in each one of the directories specified by the colon
|
|
separated list in @env{FREIOR_PATH}, otherwise in the standard frei0r
|
|
paths, which are in this order: @file{HOME/.frei0r-1/lib/},
|
|
@file{/usr/local/lib/frei0r-1/}, @file{/usr/lib/frei0r-1/}.
|
|
|
|
@var{param1}, @var{param2}, ... , @var{paramN} specify the parameters
|
|
for the frei0r effect.
|
|
|
|
A frei0r effect parameter can be a boolean (whose values are specified
|
|
with "y" and "n"), a double, a color (specified by the syntax
|
|
@var{R}/@var{G}/@var{B}, @var{R}, @var{G}, and @var{B} being float
|
|
numbers from 0.0 to 1.0) or by an @code{av_parse_color()} color
|
|
description), a position (specified by the syntax @var{X}/@var{Y},
|
|
@var{X} and @var{Y} being float numbers) and a string.
|
|
|
|
The number and kind of parameters depend on the loaded effect. If an
|
|
effect parameter is not specified the default value is set.
|
|
|
|
Some examples follow:
|
|
@example
|
|
# apply the distort0r effect, set the first two double parameters
|
|
frei0r=distort0r:0.5:0.01
|
|
|
|
# apply the colordistance effect, takes a color as first parameter
|
|
frei0r=colordistance:0.2/0.3/0.4
|
|
frei0r=colordistance:violet
|
|
frei0r=colordistance:0x112233
|
|
|
|
# apply the perspective effect, specify the top left and top right
|
|
# image positions
|
|
frei0r=perspective:0.2/0.2:0.8/0.2
|
|
@end example
|
|
|
|
For more information see:
|
|
@url{http://piksel.org/frei0r}
|
|
|
|
@section hflip
|
|
|
|
Flip the input video horizontally.
|
|
|
|
For example to horizontally flip the video in input with
|
|
@file{ffmpeg}:
|
|
@example
|
|
ffmpeg -i in.avi -vf "hflip" out.avi
|
|
@end example
|
|
|
|
@section noformat
|
|
|
|
Force libavfilter not to use any of the specified pixel formats for the
|
|
input to the next filter.
|
|
|
|
The filter accepts a list of pixel format names, separated by ":",
|
|
for example "yuv420p:monow:rgb24".
|
|
|
|
The following command:
|
|
|
|
@example
|
|
./ffmpeg -i in.avi -vf "noformat=yuv420p, vflip" out.avi
|
|
@end example
|
|
|
|
will make libavfilter use a format different from "yuv420p" for the
|
|
input to the vflip filter.
|
|
|
|
@section null
|
|
|
|
Pass the video source unchanged to the output.
|
|
|
|
@section ocv_smooth
|
|
|
|
Apply smooth transform using libopencv.
|
|
|
|
To enable this filter install libopencv library and headers and
|
|
configure FFmpeg with --enable-libopencv.
|
|
|
|
The filter accepts the following parameters:
|
|
@var{type}:@var{param1}:@var{param2}:@var{param3}:@var{param4}.
|
|
|
|
@var{type} is the type of smooth filter to apply, and can be one of
|
|
the following values: "blur", "blur_no_scale", "median", "gaussian",
|
|
"bilateral". The default value is "gaussian".
|
|
|
|
@var{param1}, @var{param2}, @var{param3}, and @var{param4} are
|
|
parameters whose meanings depend on smooth type. @var{param1} and
|
|
@var{param2} accept integer positive values or 0, @var{param3} and
|
|
@var{param4} accept float values.
|
|
|
|
The default value for @var{param1} is 3, the default value for the
|
|
other parameters is 0.
|
|
|
|
These parameters correspond to the parameters assigned to the
|
|
libopencv function @code{cvSmooth}. Refer to the official libopencv
|
|
documentation for the exact meaning of the parameters:
|
|
@url{http://opencv.willowgarage.com/documentation/c/image_filtering.html}
|
|
|
|
@section pad
|
|
|
|
Add paddings to the input image, and places the original input at the
|
|
given coordinates @var{x}, @var{y}.
|
|
|
|
It accepts the following parameters:
|
|
@var{width}:@var{height}:@var{x}:@var{y}:@var{color}.
|
|
|
|
Follows the description of the accepted parameters.
|
|
|
|
@table @option
|
|
@item width, height
|
|
|
|
Specify the size of the output image with the paddings added. If the
|
|
value for @var{width} or @var{height} is 0, the corresponding input size
|
|
is used for the output.
|
|
|
|
The default value of @var{width} and @var{height} is 0.
|
|
|
|
@item x, y
|
|
|
|
Specify the offsets where to place the input image in the padded area
|
|
with respect to the top/left border of the output image.
|
|
|
|
The default value of @var{x} and @var{y} is 0.
|
|
|
|
@item color
|
|
|
|
Specify the color of the padded area, it can be the name of a color
|
|
(case insensitive match) or a 0xRRGGBB[AA] sequence.
|
|
|
|
The default value of @var{color} is "black".
|
|
|
|
@end table
|
|
|
|
@section pixdesctest
|
|
|
|
Pixel format descriptor test filter, mainly useful for internal
|
|
testing. The output video should be equal to the input video.
|
|
|
|
For example:
|
|
@example
|
|
format=monow, pixdesctest
|
|
@end example
|
|
|
|
can be used to test the monowhite pixel format descriptor definition.
|
|
|
|
@section scale
|
|
|
|
Scale the input video to @var{width}:@var{height} and/or convert the image format.
|
|
|
|
For example the command:
|
|
|
|
@example
|
|
./ffmpeg -i in.avi -vf "scale=200:100" out.avi
|
|
@end example
|
|
|
|
will scale the input video to a size of 200x100.
|
|
|
|
If the input image format is different from the format requested by
|
|
the next filter, the scale filter will convert the input to the
|
|
requested format.
|
|
|
|
If the value for @var{width} or @var{height} is 0, the respective input
|
|
size is used for the output.
|
|
|
|
If the value for @var{width} or @var{height} is -1, the scale filter will
|
|
use, for the respective output size, a value that maintains the aspect
|
|
ratio of the input image.
|
|
|
|
The default value of @var{width} and @var{height} is 0.
|
|
|
|
@section settb
|
|
|
|
Set the timebase to use for the output frames timestamps.
|
|
It is mainly useful for testing timebase configuration.
|
|
|
|
It accepts in input an arithmetic expression representing a rational.
|
|
The expression can contain the constants "PI", "E", "PHI", "AVTB" (the
|
|
default timebase), and "intb" (the input timebase).
|
|
|
|
The default value for the input is "intb".
|
|
|
|
Follow some examples.
|
|
|
|
@example
|
|
# set the timebase to 1/25
|
|
settb=1/25
|
|
|
|
# set the timebase to 1/10
|
|
settb=0.1
|
|
|
|
#set the timebase to 1001/1000
|
|
settb=1+0.001
|
|
|
|
#set the timebase to 2*intb
|
|
settb=2*intb
|
|
|
|
#set the default timebase value
|
|
settb=AVTB
|
|
@end example
|
|
|
|
@section slicify
|
|
|
|
Pass the images of input video on to next video filter as multiple
|
|
slices.
|
|
|
|
@example
|
|
./ffmpeg -i in.avi -vf "slicify=32" out.avi
|
|
@end example
|
|
|
|
The filter accepts the slice height as parameter. If the parameter is
|
|
not specified it will use the default value of 16.
|
|
|
|
Adding this in the beginning of filter chains should make filtering
|
|
faster due to better use of the memory cache.
|
|
|
|
@section unsharp
|
|
|
|
Sharpen or blur the input video.
|
|
|
|
It accepts the following parameters:
|
|
@var{luma_msize_x}:@var{luma_msize_y}:@var{luma_amount}:@var{chroma_msize_x}:@var{chroma_msize_y}:@var{chroma_amount}
|
|
|
|
Negative values for the amount will blur the input video, while positive
|
|
values will sharpen. All parameters are optional and default to the
|
|
equivalent of the string '5:5:1.0:0:0:0.0'.
|
|
|
|
@table @option
|
|
|
|
@item luma_msize_x
|
|
Set the luma matrix horizontal size. It can be an integer between 3
|
|
and 13, default value is 5.
|
|
|
|
@item luma_msize_y
|
|
Set the luma matrix vertical size. It can be an integer between 3
|
|
and 13, default value is 5.
|
|
|
|
@item luma_amount
|
|
Set the luma effect strength. It can be a float number between -2.0
|
|
and 5.0, default value is 1.0.
|
|
|
|
@item chroma_msize_x
|
|
Set the chroma matrix horizontal size. It can be an integer between 3
|
|
and 13, default value is 0.
|
|
|
|
@item chroma_msize_y
|
|
Set the chroma matrix vertical size. It can be an integer between 3
|
|
and 13, default value is 0.
|
|
|
|
@item luma_amount
|
|
Set the chroma effect strength. It can be a float number between -2.0
|
|
and 5.0, default value is 0.0.
|
|
|
|
@end table
|
|
|
|
@example
|
|
# Strong luma sharpen effect parameters
|
|
unsharp=7:7:2.5
|
|
|
|
# Strong blur of both luma and chroma parameters
|
|
unsharp=7:7:-2:7:7:-2
|
|
|
|
# Use the default values with @command{ffmpeg}
|
|
./ffmpeg -i in.avi -vf "unsharp" out.mp4
|
|
@end example
|
|
|
|
@section vflip
|
|
|
|
Flip the input video vertically.
|
|
|
|
@example
|
|
./ffmpeg -i in.avi -vf "vflip" out.avi
|
|
@end example
|
|
|
|
@section yadif
|
|
|
|
yadif is "yet another deinterlacing filter".
|
|
|
|
It accepts the syntax:
|
|
@example
|
|
yadif=[@var{mode}[:@var{parity}]]
|
|
@end example
|
|
|
|
@table @option
|
|
|
|
@item mode
|
|
Specify the interlacing mode to adopt, accepts one of the following values.
|
|
|
|
0: Output 1 frame for each frame.
|
|
|
|
1: Output 1 frame for each field.
|
|
|
|
2: Like 0 but skips spatial interlacing check.
|
|
|
|
3: Like 1 but skips spatial interlacing check.
|
|
|
|
Default value is 0.
|
|
|
|
@item parity
|
|
0 if is bottom field first, 1 if the interlaced video is top field
|
|
first, -1 to enable automatic detection.
|
|
|
|
@end table
|
|
|
|
@c man end VIDEO FILTERS
|
|
|
|
@chapter Video Sources
|
|
@c man begin VIDEO SOURCES
|
|
|
|
Below is a description of the currently available video sources.
|
|
|
|
@section buffer
|
|
|
|
Buffer video 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/vsrc_buffer.h}.
|
|
|
|
It accepts the following parameters:
|
|
@var{width}:@var{height}:@var{pix_fmt_string}
|
|
|
|
All the parameters need to be explicitely defined.
|
|
|
|
Follows the list of the accepted parameters.
|
|
|
|
@table @option
|
|
|
|
@item width, height
|
|
Specify the width and height of the buffered video frames.
|
|
|
|
@item pix_fmt_string
|
|
|
|
A string representing the pixel format of the buffered video frames.
|
|
It may be a number corresponding to a pixel format, or a pixel format
|
|
name.
|
|
|
|
@end table
|
|
|
|
For example:
|
|
@example
|
|
buffer=320:240:yuv410p
|
|
@end example
|
|
|
|
will instruct the source to accept video frames with size 320x240 and
|
|
with format "yuv410p". Since the pixel format with name "yuv410p"
|
|
corresponds to the number 6 (check the enum PixelFormat definition in
|
|
@file{libavutil/pixfmt.h}), this example corresponds to:
|
|
@example
|
|
buffer=320:240:6
|
|
@end example
|
|
|
|
@section color
|
|
|
|
Provide an uniformly colored input.
|
|
|
|
It accepts the following parameters:
|
|
@var{color}:@var{frame_size}:@var{frame_rate}
|
|
|
|
Follows the description of the accepted parameters.
|
|
|
|
@table @option
|
|
|
|
@item color
|
|
Specify the color of the source. It can be the name of a color (case
|
|
insensitive match) or a 0xRRGGBB[AA] sequence, possibly followed by an
|
|
alpha specifier. The default value is "black".
|
|
|
|
@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
|
|
default value is "320x240".
|
|
|
|
@item frame_rate
|
|
Specify the frame rate of the sourced video, as the number of frames
|
|
generated per second. It has to be a string in the format
|
|
@var{frame_rate_num}/@var{frame_rate_den}, an integer number, a float
|
|
number or a valid video frame rate abbreviation. The default value is
|
|
"25".
|
|
|
|
@end table
|
|
|
|
For example the following graph description will generate a red source
|
|
with an opacity of 0.2, with size "qcif" and a frame rate of 10
|
|
frames per second, which will be overlayed over the source connected
|
|
to the pad with identifier "in".
|
|
|
|
@example
|
|
"color=red@@0.2:qcif:10 [color]; [in][color] overlay [out]"
|
|
@end example
|
|
|
|
@section nullsrc
|
|
|
|
Null video source, never return images. It is mainly useful as a
|
|
template and to be employed in analysis / debugging tools.
|
|
|
|
It accepts as optional parameter a string of the form
|
|
@var{width}:@var{height}:@var{timebase}.
|
|
|
|
@var{width} and @var{height} specify the size of the configured
|
|
source. The default values of @var{width} and @var{height} are
|
|
respectively 352 and 288 (corresponding to the CIF size format).
|
|
|
|
@var{timebase} specifies an arithmetic expression representing a
|
|
timebase. The expression can contain the constants "PI", "E", "PHI",
|
|
"AVTB" (the default timebase), and defaults to the value "AVTB".
|
|
|
|
@c man end VIDEO SOURCES
|
|
|
|
@chapter Video Sinks
|
|
@c man begin VIDEO SINKS
|
|
|
|
Below is a description of the currently available video sinks.
|
|
|
|
@section nullsink
|
|
|
|
Null video sink, do absolutely nothing with the input video. It is
|
|
mainly useful as a template and to be employed in analysis / debugging
|
|
tools.
|
|
|
|
@c man end VIDEO SINKS
|
|
|