2 @c man begin VIDEO FILTERS
4 When you configure your FFmpeg build, you can disable any of the
5 existing filters using --disable-filters.
6 The configure output will show the video filters included in your
9 Below is a description of the currently available video filters.
13 Crop the input video to @var{x}:@var{y}:@var{width}:@var{height}.
16 ./ffmpeg -i in.avi -vf "crop=0:0:0:240" out.avi
19 @var{x} and @var{y} specify the position of the top-left corner of the
20 output (non-cropped) area.
22 The default value of @var{x} and @var{y} is 0.
24 The @var{width} and @var{height} parameters specify the width and height
25 of the output (non-cropped) area.
27 A value of 0 is interpreted as the maximum possible size contained in
28 the area delimited by the top-left corner at position x:y.
30 For example the parameters:
36 will delimit the rectangle with the top-left corner placed at position
37 100:100 and the right-bottom corner corresponding to the right-bottom
38 corner of the input image.
40 The default value of @var{width} and @var{height} is 0.
44 Convert the input video to one of the specified pixel formats.
45 Libavfilter will try to pick one that is supported for the input to
48 The filter accepts a list of pixel format names, separated by ``:'',
49 for example ``yuv420p:monow:rgb24''.
51 The following command:
54 ./ffmpeg -i in.avi -vf "format=yuv420p" out.avi
57 will convert the input video to the format ``yuv420p''.
61 Flip the input video horizontally.
63 For example to horizontally flip the video in input with
66 ffmpeg -i in.avi -vf "hflip" out.avi
71 Force libavfilter not to use any of the specified pixel formats for the
72 input to the next filter.
74 The filter accepts a list of pixel format names, separated by ``:'',
75 for example ``yuv420p:monow:rgb24''.
77 The following command:
80 ./ffmpeg -i in.avi -vf "noformat=yuv420p, vflip" out.avi
83 will make libavfilter use a format different from ``yuv420p'' for the
84 input to the vflip filter.
88 Pass the source unchanged to the output.
92 Add paddings to the input image, and places the original input at the
93 given coordinates @var{x}, @var{y}.
95 It accepts the following parameters:
96 @var{width}:@var{height}:@var{x}:@var{y}:@var{color}.
98 Follows the description of the accepted parameters.
103 Specify the size of the output image with the paddings added. If the
104 value for @var{width} or @var{height} is 0, the corresponding input size
105 is used for the output.
107 The default value of @var{width} and @var{height} is 0.
111 Specify the offsets where to place the input image in the padded area
112 with respect to the top/left border of the output image.
114 The default value of @var{x} and @var{y} is 0.
118 Specify the color of the padded area, it can be the name of a color
119 (case insensitive match) or a 0xRRGGBB[AA] sequence.
121 The default value of @var{color} is ``black''.
127 Pixel format descriptor test filter, mainly useful for internal
128 testing. The output video should be equal to the input video.
132 format=monow, pixdesctest
135 can be used to test the monowhite pixel format descriptor definition.
139 Scale the input video to @var{width}:@var{height} and/or convert the image format.
141 For example the command:
144 ./ffmpeg -i in.avi -vf "scale=200:100" out.avi
147 will scale the input video to a size of 200x100.
149 If the input image format is different from the format requested by
150 the next filter, the scale filter will convert the input to the
153 If the value for @var{width} or @var{height} is 0, the respective input
154 size is used for the output.
156 If the value for @var{width} or @var{height} is -1, the scale filter will
157 use, for the respective output size, a value that maintains the aspect
158 ratio of the input image.
160 The default value of @var{width} and @var{height} is 0.
164 Pass the images of input video on to next video filter as multiple
168 ./ffmpeg -i in.avi -vf "slicify=32" out.avi
171 The filter accepts the slice height as parameter. If the parameter is
172 not specified it will use the default value of 16.
174 Adding this in the beginning of filter chains should make filtering
175 faster due to better use of the memory cache.
179 Sharpen or blur the input video.
181 It accepts the following parameters:
182 @var{luma_msize_x}:@var{luma_msize_y}:@var{luma_amount}:@var{chroma_msize_x}:@var{chroma_msize_y}:@var{chroma_amount}
184 Negative values for the amount will blur the input video, while positive
185 values will sharpen. All parameters are optional and default to the
186 equivalent of the string '5:5:1.0:0:0:0.0'.
191 Set the luma matrix horizontal size. It can be an integer between 3
192 and 13, default value is 5.
195 Set the luma matrix vertical size. It can be an integer between 3
196 and 13, default value is 5.
199 Set the luma effect strength. It can be a float number between -2.0
200 and 5.0, default value is 1.0.
203 Set the chroma matrix horizontal size. It can be an integer between 3
204 and 13, default value is 0.
207 Set the chroma matrix vertical size. It can be an integer between 3
208 and 13, default value is 0.
211 Set the chroma effect strength. It can be a float number between -2.0
212 and 5.0, default value is 0.0.
217 # Strong luma sharpen effect parameters
220 # Strong blur of both luma and chroma parameters
221 unsharp=7:7:-2:7:7:-2
223 # Use the default values with @command{ffmpeg}
224 ./ffmpeg -i in.avi -vf "unsharp" out.mp4
229 Flip the input video vertically.
232 ./ffmpeg -i in.avi -vf "vflip" out.avi
235 @c man end VIDEO FILTERS
237 @chapter Video Sources
238 @c man begin VIDEO SOURCES
240 Below is a description of the currently available video sources.
244 Buffer video frames, and make them available to the filter chain.
246 This source is mainly intended for a programmatic use, in particular
247 through the interface defined in @file{libavfilter/vsrc_buffer.h}.
249 It accepts the following parameters:
250 @var{width}:@var{height}:@var{pix_fmt_string}
252 All the parameters need to be explicitely defined.
254 Follows the list of the accepted parameters.
259 Specify the width and height of the buffered video frames.
263 A string representing the pixel format of the buffered video frames.
264 It may be a number corresponding to a pixel format, or a pixel format
271 buffer=320:240:yuv410p
274 will instruct the source to accept video frames with size 320x240 and
275 with format "yuv410p". Since the pixel format with name "yuv410p"
276 corresponds to the number 6 (check the enum PixelFormat definition in
277 @file{libavutil/pixfmt.h}), this example corresponds to:
284 Provide an uniformly colored input.
286 It accepts the following parameters:
287 @var{color}:@var{frame_size}:@var{frame_rate}
289 Follows the description of the accepted parameters.
294 Specify the color of the source. It can be the name of a color (case
295 insensitive match) or a 0xRRGGBB[AA] sequence, possibly followed by an
296 alpha specifier. The default value is "black".
299 Specify the size of the sourced video, it may be a string of the form
300 @var{width}x@var{heigth}, or the name of a size abbreviation. The
301 default value is "320x240".
304 Specify the frame rate of the sourced video, as the number of frames
305 generated per second. It has to be a string in the format
306 @var{frame_rate_num}/@var{frame_rate_den}, an integer number, a float
307 number or a valid video frame rate abbreviation. The default value is
312 For example the following graph description will generate a red source
313 with an opacity of 0.2, with size "qcif" and a frame rate of 10
314 frames per second, which will be overlayed over the source connected
315 to the pad with identifier "in".
318 "color=red@@0.2:qcif:10 [color]; [in][color] overlay [out]"
323 Null video source, never return images. It is mainly useful as a
324 template and to be employed in analysis / debugging tools.
326 It accepts as optional parameter a string of the form
327 @var{width}:@var{height}, where @var{width} and @var{height} specify the size of
328 the configured source.
330 The default values of @var{width} and @var{height} are respectively 352
331 and 288 (corresponding to the CIF size format).
333 @c man end VIDEO SOURCES
336 @c man begin VIDEO SINKS
338 Below is a description of the currently available video sinks.
342 Null video sink, do absolutely nothing with the input video. It is
343 mainly useful as a template and to be employed in analysis / debugging
346 @c man end VIDEO SINKS