ffmpeg / doc / filters.texi @ f0a55438
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1 | f59e9eaf | Stefano Sabatini | @chapter Audio Filters |
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2 | @c man begin AUDIO FILTERS |
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3 | |||
4 | When you configure your FFmpeg build, you can disable any of the |
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5 | existing filters using --disable-filters. |
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6 | The configure output will show the audio filters included in your |
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7 | build. |
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8 | |||
9 | Below is a description of the currently available audio filters. |
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10 | |||
11 | 99046339 | S.N. Hemanth Meenakshisundaram | @section anull |
12 | |||
13 | Pass the audio source unchanged to the output. |
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14 | |||
15 | f59e9eaf | Stefano Sabatini | @c man end AUDIO FILTERS |
16 | |||
17 | 1ee410f3 | Stefano Sabatini | @chapter Audio Sources |
18 | @c man begin AUDIO SOURCES |
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19 | |||
20 | Below is a description of the currently available audio sources. |
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21 | |||
22 | @section anullsrc |
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23 | |||
24 | Null audio source, never return audio frames. It is mainly useful as a |
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25 | template and to be employed in analysis / debugging tools. |
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26 | |||
27 | It accepts as optional parameter a string of the form |
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28 | @var{sample_rate}:@var{channel_layout}. |
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29 | |||
30 | @var{sample_rate} specify the sample rate, and defaults to 44100. |
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31 | |||
32 | @var{channel_layout} specify the channel layout, and can be either an |
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33 | integer or a string representing a channel layout. The default value |
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34 | of @var{channel_layout} is 3, which corresponds to CH_LAYOUT_STEREO. |
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35 | |||
36 | Check the channel_layout_map definition in |
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37 | @file{libavcodec/audioconvert.c} for the correspondance between string |
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38 | and channel layout values. |
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39 | |||
40 | Follow some examples: |
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41 | @example |
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42 | # set the sample rate to 48000 Hz and the channel layout to CH_LAYOUT_MONO. |
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43 | anullsrc=48000:4 |
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44 | |||
45 | # same as |
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46 | anullsrc=48000:mono |
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47 | @end example |
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48 | |||
49 | @c man end AUDIO SOURCES |
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50 | |||
51 | f0a55438 | S.N. Hemanth Meenakshisundaram | @chapter Audio Sinks |
52 | @c man begin AUDIO SINKS |
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53 | |||
54 | Below is a description of the currently available audio sinks. |
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55 | |||
56 | @section anullsink |
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57 | |||
58 | Null audio sink, do absolutely nothing with the input audio. It is |
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59 | mainly useful as a template and to be employed in analysis / debugging |
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60 | tools. |
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61 | |||
62 | @c man end AUDIO SINKS |
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63 | |||
64 | 3275ac6a | Stefano Sabatini | @chapter Video Filters |
65 | @c man begin VIDEO FILTERS |
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66 | |||
67 | When you configure your FFmpeg build, you can disable any of the |
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68 | existing filters using --disable-filters. |
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69 | The configure output will show the video filters included in your |
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70 | build. |
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71 | |||
72 | Below is a description of the currently available video filters. |
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73 | |||
74 | @section crop |
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75 | |||
76 | 75b67a8a | Stefano Sabatini | Crop the input video to @var{out_w}:@var{out_h}:@var{x}:@var{y}. |
77 | 3275ac6a | Stefano Sabatini | |
78 | 75b67a8a | Stefano Sabatini | The parameters are expressions containing the following constants: |
79 | |||
80 | @table @option |
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81 | @item E, PI, PHI |
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82 | the corresponding mathematical approximated values for e |
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83 | (euler number), pi (greek PI), PHI (golden ratio) |
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84 | |||
85 | @item x, y |
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86 | the computed values for @var{x} and @var{y}. They are evaluated for |
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87 | each new frame. |
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88 | |||
89 | @item in_w, in_h |
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90 | the input width and heigth |
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91 | |||
92 | @item iw, ih |
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93 | same as @var{in_w} and @var{in_h} |
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94 | |||
95 | @item out_w, out_h |
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96 | the output (cropped) width and heigth |
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97 | |||
98 | @item ow, oh |
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99 | same as @var{out_w} and @var{out_h} |
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100 | |||
101 | @item n |
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102 | the number of input frame, starting from 0 |
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103 | |||
104 | @item pos |
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105 | the position in the file of the input frame, NAN if unknown |
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106 | |||
107 | @item t |
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108 | timestamp expressed in seconds, NAN if the input timestamp is unknown |
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109 | 3275ac6a | Stefano Sabatini | |
110 | 75b67a8a | Stefano Sabatini | @end table |
111 | 3275ac6a | Stefano Sabatini | |
112 | 75b67a8a | Stefano Sabatini | The @var{out_w} and @var{out_h} parameters specify the expressions for |
113 | the width and height of the output (cropped) video. They are |
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114 | evaluated just at the configuration of the filter. |
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115 | 3275ac6a | Stefano Sabatini | |
116 | 75b67a8a | Stefano Sabatini | The default value of @var{out_w} is "in_w", and the default value of |
117 | @var{out_h} is "in_h". |
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118 | 2bc05d35 | Stefano Sabatini | |
119 | 75b67a8a | Stefano Sabatini | The expression for @var{out_w} may depend on the value of @var{out_h}, |
120 | and the expression for @var{out_h} may depend on @var{out_w}, but they |
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121 | cannot depend on @var{x} and @var{y}, as @var{x} and @var{y} are |
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122 | evaluated after @var{out_w} and @var{out_h}. |
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123 | 2bc05d35 | Stefano Sabatini | |
124 | 75b67a8a | Stefano Sabatini | The @var{x} and @var{y} parameters specify the expressions for the |
125 | position of the top-left corner of the output (non-cropped) area. They |
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126 | are evaluated for each frame. If the evaluated value is not valid, it |
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127 | is approximated to the nearest valid value. |
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128 | 3275ac6a | Stefano Sabatini | |
129 | 75b67a8a | Stefano Sabatini | The default value of @var{x} is "(in_w-out_w)/2", and the default |
130 | value for @var{y} is "(in_h-out_h)/2", which set the cropped area at |
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131 | the center of the input image. |
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132 | |||
133 | The expression for @var{x} may depend on @var{y}, and the expression |
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134 | for @var{y} may depend on @var{x}. |
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135 | |||
136 | Follow some examples: |
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137 | 3275ac6a | Stefano Sabatini | @example |
138 | 75b67a8a | Stefano Sabatini | # crop the central input area with size 100x100 |
139 | crop=100:100 |
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140 | |||
141 | # crop the central input area with size 2/3 of the input video |
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142 | "crop=2/3*in_w:2/3*in_h" |
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143 | |||
144 | # crop the input video central square |
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145 | crop=in_h |
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146 | |||
147 | # delimit the rectangle with the top-left corner placed at position |
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148 | # 100:100 and the right-bottom corner corresponding to the right-bottom |
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149 | # corner of the input image. |
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150 | crop=in_w-100:in_h-100:100:100 |
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151 | 3275ac6a | Stefano Sabatini | |
152 | 75b67a8a | Stefano Sabatini | # crop 10 pixels from the lefth and right borders, and 20 pixels from |
153 | # the top and bottom borders |
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154 | "crop=in_w-2*10:in_h-2*20" |
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155 | 3275ac6a | Stefano Sabatini | |
156 | 75b67a8a | Stefano Sabatini | # keep only the bottom right quarter of the input image |
157 | "crop=in_w/2:in_h/2:in_w/2:in_h/2" |
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158 | |||
159 | # crop height for getting Greek harmony |
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160 | "crop=in_w:1/PHI*in_w" |
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161 | |||
162 | # trembling effect |
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163 | "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)" |
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164 | |||
165 | # erratic camera effect depending on timestamp and position |
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166 | "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)" |
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167 | |||
168 | # set x depending on the value of y |
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169 | "crop=in_w/2:in_h/2:y:10+10*sin(n/10)" |
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170 | @end example |
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171 | 3275ac6a | Stefano Sabatini | |
172 | 7f1af825 | Stefano Sabatini | @section fifo |
173 | |||
174 | Buffer input images and send them when they are requested. |
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175 | |||
176 | This filter is mainly useful when auto-inserted by the libavfilter |
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177 | framework. |
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178 | |||
179 | The filter does not take parameters. |
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180 | |||
181 | 3275ac6a | Stefano Sabatini | @section format |
182 | |||
183 | Convert the input video to one of the specified pixel formats. |
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184 | Libavfilter will try to pick one that is supported for the input to |
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185 | the next filter. |
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186 | |||
187 | b1094275 | Stefano Sabatini | The filter accepts a list of pixel format names, separated by ":", |
188 | for example "yuv420p:monow:rgb24". |
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189 | 3275ac6a | Stefano Sabatini | |
190 | The following command: |
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191 | |||
192 | @example |
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193 | ./ffmpeg -i in.avi -vf "format=yuv420p" out.avi |
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194 | @end example |
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195 | |||
196 | b1094275 | Stefano Sabatini | will convert the input video to the format "yuv420p". |
197 | 3275ac6a | Stefano Sabatini | |
198 | 47941088 | Stefano Sabatini | @section frei0r |
199 | |||
200 | Apply a frei0r effect to the input video. |
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201 | |||
202 | To enable compilation of this filter you need to install the frei0r |
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203 | header and configure FFmpeg with --enable-frei0r. |
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204 | |||
205 | The filter supports the syntax: |
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206 | @example |
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207 | @var{filter_name}:@var{param1}:@var{param2}:...:@var{paramN} |
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208 | @end example |
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209 | |||
210 | @var{filter_name} is the name to the frei0r effect to load. If the |
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211 | environment variable @env{FREI0R_PATH} is defined, the frei0r effect |
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212 | is searched in each one of the directories specified by the colon |
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213 | separated list in @env{FREIOR_PATH}, otherwise in the standard frei0r |
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214 | paths, which are in this order: @file{HOME/.frei0r-1/lib/}, |
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215 | @file{/usr/local/lib/frei0r-1/}, @file{/usr/lib/frei0r-1/}. |
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216 | |||
217 | @var{param1}, @var{param2}, ... , @var{paramN} specify the parameters |
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218 | for the frei0r effect. |
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219 | |||
220 | A frei0r effect parameter can be a boolean (whose values are specified |
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221 | with "y" and "n"), a double, a color (specified by the syntax |
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222 | @var{R}/@var{G}/@var{B}, @var{R}, @var{G}, and @var{B} being float |
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223 | numbers from 0.0 to 1.0) or by an @code{av_parse_color()} color |
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224 | description), a position (specified by the syntax @var{X}/@var{Y}, |
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225 | @var{X} and @var{Y} being float numbers) and a string. |
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226 | |||
227 | The number and kind of parameters depend on the loaded effect. If an |
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228 | effect parameter is not specified the default value is set. |
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229 | |||
230 | Some examples follow: |
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231 | @example |
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232 | # apply the distort0r effect, set the first two double parameters |
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233 | frei0r=distort0r:0.5:0.01 |
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234 | |||
235 | # apply the colordistance effect, takes a color as first parameter |
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236 | frei0r=colordistance:0.2/0.3/0.4 |
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237 | frei0r=colordistance:violet |
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238 | frei0r=colordistance:0x112233 |
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239 | |||
240 | # apply the perspective effect, specify the top left and top right |
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241 | # image positions |
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242 | frei0r=perspective:0.2/0.2:0.8/0.2 |
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243 | @end example |
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244 | |||
245 | For more information see: |
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246 | @url{http://piksel.org/frei0r} |
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247 | |||
248 | a1e171df | Stefano Sabatini | @section hflip |
249 | |||
250 | Flip the input video horizontally. |
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251 | |||
252 | For example to horizontally flip the video in input with |
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253 | @file{ffmpeg}: |
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254 | @example |
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255 | ffmpeg -i in.avi -vf "hflip" out.avi |
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256 | @end example |
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257 | |||
258 | 3275ac6a | Stefano Sabatini | @section noformat |
259 | |||
260 | Force libavfilter not to use any of the specified pixel formats for the |
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261 | input to the next filter. |
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262 | |||
263 | b1094275 | Stefano Sabatini | The filter accepts a list of pixel format names, separated by ":", |
264 | for example "yuv420p:monow:rgb24". |
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265 | 3275ac6a | Stefano Sabatini | |
266 | The following command: |
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267 | |||
268 | @example |
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269 | ./ffmpeg -i in.avi -vf "noformat=yuv420p, vflip" out.avi |
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270 | @end example |
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271 | |||
272 | b1094275 | Stefano Sabatini | will make libavfilter use a format different from "yuv420p" for the |
273 | 3275ac6a | Stefano Sabatini | input to the vflip filter. |
274 | |||
275 | @section null |
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276 | |||
277 | 99046339 | S.N. Hemanth Meenakshisundaram | Pass the video source unchanged to the output. |
278 | 3275ac6a | Stefano Sabatini | |
279 | 6ebf0bfc | Stefano Sabatini | @section ocv_smooth |
280 | |||
281 | Apply smooth transform using libopencv. |
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282 | |||
283 | To enable this filter install libopencv library and headers and |
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284 | configure FFmpeg with --enable-libopencv. |
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285 | |||
286 | 58d94364 | Stefano Sabatini | The filter accepts the following parameters: |
287 | 6ebf0bfc | Stefano Sabatini | @var{type}:@var{param1}:@var{param2}:@var{param3}:@var{param4}. |
288 | |||
289 | @var{type} is the type of smooth filter to apply, and can be one of |
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290 | 58d94364 | Stefano Sabatini | the following values: "blur", "blur_no_scale", "median", "gaussian", |
291 | 6ebf0bfc | Stefano Sabatini | "bilateral". The default value is "gaussian". |
292 | |||
293 | @var{param1}, @var{param2}, @var{param3}, and @var{param4} are |
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294 | parameters whose meanings depend on smooth type. @var{param1} and |
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295 | @var{param2} accept integer positive values or 0, @var{param3} and |
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296 | @var{param4} accept float values. |
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297 | |||
298 | The default value for @var{param1} is 3, the default value for the |
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299 | other parameters is 0. |
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300 | |||
301 | 58d94364 | Stefano Sabatini | These parameters correspond to the parameters assigned to the |
302 | libopencv function @code{cvSmooth}. Refer to the official libopencv |
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303 | 6ebf0bfc | Stefano Sabatini | documentation for the exact meaning of the parameters: |
304 | @url{http://opencv.willowgarage.com/documentation/c/image_filtering.html} |
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305 | |||
306 | 3275ac6a | Stefano Sabatini | @section pad |
307 | |||
308 | Add paddings to the input image, and places the original input at the |
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309 | given coordinates @var{x}, @var{y}. |
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310 | |||
311 | It accepts the following parameters: |
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312 | @var{width}:@var{height}:@var{x}:@var{y}:@var{color}. |
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313 | |||
314 | Follows the description of the accepted parameters. |
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315 | |||
316 | @table @option |
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317 | @item width, height |
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318 | |||
319 | Specify the size of the output image with the paddings added. If the |
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320 | value for @var{width} or @var{height} is 0, the corresponding input size |
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321 | is used for the output. |
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322 | |||
323 | The default value of @var{width} and @var{height} is 0. |
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324 | |||
325 | @item x, y |
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326 | |||
327 | Specify the offsets where to place the input image in the padded area |
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328 | with respect to the top/left border of the output image. |
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329 | |||
330 | The default value of @var{x} and @var{y} is 0. |
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331 | |||
332 | @item color |
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333 | |||
334 | Specify the color of the padded area, it can be the name of a color |
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335 | (case insensitive match) or a 0xRRGGBB[AA] sequence. |
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336 | |||
337 | b1094275 | Stefano Sabatini | The default value of @var{color} is "black". |
338 | 3275ac6a | Stefano Sabatini | |
339 | @end table |
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340 | |||
341 | ce2e4ae3 | Stefano Sabatini | @section pixdesctest |
342 | |||
343 | Pixel format descriptor test filter, mainly useful for internal |
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344 | testing. The output video should be equal to the input video. |
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345 | |||
346 | For example: |
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347 | @example |
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348 | format=monow, pixdesctest |
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349 | @end example |
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350 | |||
351 | can be used to test the monowhite pixel format descriptor definition. |
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352 | |||
353 | 3275ac6a | Stefano Sabatini | @section scale |
354 | |||
355 | Scale the input video to @var{width}:@var{height} and/or convert the image format. |
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356 | |||
357 | For example the command: |
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358 | |||
359 | @example |
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360 | ./ffmpeg -i in.avi -vf "scale=200:100" out.avi |
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361 | @end example |
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362 | |||
363 | will scale the input video to a size of 200x100. |
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364 | |||
365 | If the input image format is different from the format requested by |
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366 | the next filter, the scale filter will convert the input to the |
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367 | requested format. |
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368 | |||
369 | If the value for @var{width} or @var{height} is 0, the respective input |
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370 | size is used for the output. |
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371 | |||
372 | If the value for @var{width} or @var{height} is -1, the scale filter will |
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373 | use, for the respective output size, a value that maintains the aspect |
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374 | ratio of the input image. |
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375 | |||
376 | The default value of @var{width} and @var{height} is 0. |
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377 | |||
378 | @section slicify |
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379 | |||
380 | Pass the images of input video on to next video filter as multiple |
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381 | slices. |
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382 | |||
383 | @example |
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384 | ./ffmpeg -i in.avi -vf "slicify=32" out.avi |
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385 | @end example |
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386 | |||
387 | The filter accepts the slice height as parameter. If the parameter is |
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388 | not specified it will use the default value of 16. |
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389 | |||
390 | Adding this in the beginning of filter chains should make filtering |
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391 | faster due to better use of the memory cache. |
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392 | |||
393 | @section unsharp |
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394 | |||
395 | 843b5fd0 | Stefano Sabatini | Sharpen or blur the input video. |
396 | |||
397 | It accepts the following parameters: |
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398 | @var{luma_msize_x}:@var{luma_msize_y}:@var{luma_amount}:@var{chroma_msize_x}:@var{chroma_msize_y}:@var{chroma_amount} |
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399 | 3275ac6a | Stefano Sabatini | |
400 | Negative values for the amount will blur the input video, while positive |
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401 | values will sharpen. All parameters are optional and default to the |
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402 | equivalent of the string '5:5:1.0:0:0:0.0'. |
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403 | |||
404 | @table @option |
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405 | |||
406 | @item luma_msize_x |
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407 | Set the luma matrix horizontal size. It can be an integer between 3 |
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408 | and 13, default value is 5. |
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409 | |||
410 | @item luma_msize_y |
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411 | Set the luma matrix vertical size. It can be an integer between 3 |
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412 | and 13, default value is 5. |
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413 | |||
414 | @item luma_amount |
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415 | Set the luma effect strength. It can be a float number between -2.0 |
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416 | and 5.0, default value is 1.0. |
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417 | |||
418 | @item chroma_msize_x |
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419 | Set the chroma matrix horizontal size. It can be an integer between 3 |
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420 | and 13, default value is 0. |
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421 | |||
422 | @item chroma_msize_y |
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423 | Set the chroma matrix vertical size. It can be an integer between 3 |
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424 | and 13, default value is 0. |
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425 | |||
426 | @item luma_amount |
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427 | Set the chroma effect strength. It can be a float number between -2.0 |
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428 | and 5.0, default value is 0.0. |
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429 | |||
430 | @end table |
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431 | |||
432 | @example |
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433 | # Strong luma sharpen effect parameters |
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434 | unsharp=7:7:2.5 |
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435 | |||
436 | # Strong blur of both luma and chroma parameters |
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437 | unsharp=7:7:-2:7:7:-2 |
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438 | |||
439 | # Use the default values with @command{ffmpeg} |
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440 | ./ffmpeg -i in.avi -vf "unsharp" out.mp4 |
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441 | @end example |
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442 | |||
443 | @section vflip |
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444 | |||
445 | Flip the input video vertically. |
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446 | |||
447 | @example |
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448 | ./ffmpeg -i in.avi -vf "vflip" out.avi |
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449 | @end example |
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450 | |||
451 | @c man end VIDEO FILTERS |
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452 | |||
453 | @chapter Video Sources |
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454 | @c man begin VIDEO SOURCES |
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455 | |||
456 | Below is a description of the currently available video sources. |
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457 | |||
458 | 24413399 | Stefano Sabatini | @section buffer |
459 | |||
460 | Buffer video frames, and make them available to the filter chain. |
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461 | |||
462 | This source is mainly intended for a programmatic use, in particular |
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463 | ac1a31ab | VĂctor Paesa | through the interface defined in @file{libavfilter/vsrc_buffer.h}. |
464 | 24413399 | Stefano Sabatini | |
465 | It accepts the following parameters: |
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466 | @var{width}:@var{height}:@var{pix_fmt_string} |
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467 | |||
468 | All the parameters need to be explicitely defined. |
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469 | |||
470 | Follows the list of the accepted parameters. |
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471 | |||
472 | @table @option |
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473 | |||
474 | @item width, height |
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475 | Specify the width and height of the buffered video frames. |
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476 | |||
477 | @item pix_fmt_string |
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478 | |||
479 | A string representing the pixel format of the buffered video frames. |
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480 | It may be a number corresponding to a pixel format, or a pixel format |
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481 | name. |
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482 | |||
483 | @end table |
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484 | |||
485 | For example: |
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486 | @example |
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487 | buffer=320:240:yuv410p |
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488 | @end example |
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489 | |||
490 | will instruct the source to accept video frames with size 320x240 and |
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491 | with format "yuv410p". Since the pixel format with name "yuv410p" |
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492 | corresponds to the number 6 (check the enum PixelFormat definition in |
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493 | @file{libavutil/pixfmt.h}), this example corresponds to: |
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494 | @example |
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495 | buffer=320:240:6 |
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496 | @end example |
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497 | |||
498 | 23ccf3c7 | Stefano Sabatini | @section color |
499 | |||
500 | Provide an uniformly colored input. |
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501 | |||
502 | It accepts the following parameters: |
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503 | b5f47309 | Stefano Sabatini | @var{color}:@var{frame_size}:@var{frame_rate} |
504 | 23ccf3c7 | Stefano Sabatini | |
505 | Follows the description of the accepted parameters. |
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506 | |||
507 | @table @option |
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508 | |||
509 | @item color |
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510 | Specify the color of the source. It can be the name of a color (case |
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511 | insensitive match) or a 0xRRGGBB[AA] sequence, possibly followed by an |
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512 | alpha specifier. The default value is "black". |
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513 | |||
514 | @item frame_size |
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515 | Specify the size of the sourced video, it may be a string of the form |
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516 | @var{width}x@var{heigth}, or the name of a size abbreviation. The |
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517 | default value is "320x240". |
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518 | |||
519 | @item frame_rate |
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520 | Specify the frame rate of the sourced video, as the number of frames |
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521 | generated per second. It has to be a string in the format |
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522 | @var{frame_rate_num}/@var{frame_rate_den}, an integer number, a float |
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523 | number or a valid video frame rate abbreviation. The default value is |
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524 | "25". |
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525 | |||
526 | @end table |
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527 | |||
528 | For example the following graph description will generate a red source |
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529 | with an opacity of 0.2, with size "qcif" and a frame rate of 10 |
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530 | frames per second, which will be overlayed over the source connected |
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531 | to the pad with identifier "in". |
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532 | |||
533 | @example |
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534 | "color=red@@0.2:qcif:10 [color]; [in][color] overlay [out]" |
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535 | @end example |
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536 | |||
537 | 3275ac6a | Stefano Sabatini | @section nullsrc |
538 | |||
539 | Null video source, never return images. It is mainly useful as a |
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540 | template and to be employed in analysis / debugging tools. |
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541 | |||
542 | It accepts as optional parameter a string of the form |
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543 | @var{width}:@var{height}, where @var{width} and @var{height} specify the size of |
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544 | the configured source. |
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545 | |||
546 | The default values of @var{width} and @var{height} are respectively 352 |
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547 | and 288 (corresponding to the CIF size format). |
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548 | |||
549 | @c man end VIDEO SOURCES |
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550 | |||
551 | @chapter Video Sinks |
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552 | @c man begin VIDEO SINKS |
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553 | |||
554 | Below is a description of the currently available video sinks. |
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555 | |||
556 | @section nullsink |
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557 | |||
558 | Null video sink, do absolutely nothing with the input video. It is |
||
559 | mainly useful as a template and to be employed in analysis / debugging |
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560 | tools. |
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561 | |||
562 | @c man end VIDEO SINKS |