mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-02 03:06:28 +02:00
843b5fd0fe
it in the previous commit. Originally committed as revision 23690 to svn://svn.ffmpeg.org/ffmpeg/trunk
247 lines
6.3 KiB
Plaintext
247 lines
6.3 KiB
Plaintext
@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 crop
|
|
|
|
Crop the input video to @var{x}:@var{y}:@var{width}:@var{height}.
|
|
|
|
@example
|
|
./ffmpeg -i in.avi -vf "crop=0:0:0:240" out.avi
|
|
@end example
|
|
|
|
@var{x} and @var{y} specify the position of the top-left corner of the
|
|
output (non-cropped) area.
|
|
|
|
The default value of @var{x} and @var{y} is 0.
|
|
|
|
The @var{width} and @var{height} parameters specify the width and height
|
|
of the output (non-cropped) area.
|
|
|
|
A value of 0 is interpreted as the maximum possible size contained in
|
|
the area delimited by the top-left corner at position x:y.
|
|
|
|
For example the parameters:
|
|
|
|
@example
|
|
"crop=100:100:0:0"
|
|
@end example
|
|
|
|
will 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.
|
|
|
|
The default value of @var{width} and @var{height} is 0.
|
|
|
|
@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 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 source unchanged to the output.
|
|
|
|
@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 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 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
|
|
|
|
@c man end VIDEO FILTERS
|
|
|
|
@chapter Video Sources
|
|
@c man begin VIDEO SOURCES
|
|
|
|
Below is a description of the currently available video sources.
|
|
|
|
@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}, where @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).
|
|
|
|
@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
|
|
|