![]() A filterchain isġ26 represented by a list of ","-separated filter descriptions.ġ27 128 A filtergraph consists of a sequence of filterchains. Each link has one input pad on one side connecting it to oneġ04 filter from which it takes its input, and one output pad on the otherġ05 side connecting it to one filter accepting its output.ġ06 107 Each filter in a filtergraph is an instance of a filter classġ08 registered in the application, which defines the features and theġ09 number of input and output pads of the filter.ġ10 111 A filter with no input pads is called a "source", and a filter with noġ16 117 A filtergraph has a textual representation, which is recognized by theġ22 124 A filterchain consists of a sequence of connected filters, each oneġ25 connected to the previous one in the sequence. It can containġ02 cycles, and there can be multiple links between a pair ofġ03 filters. ![]() Note that this string must beĨ4 a complete self-contained graph, with its inputs and outputs explicitly defined.Ĩ5 For example if your command line is of the form:Ĩ6 ffmpeg -i infile -vf scale=640:360 outfileĨ9 your string will need to be of the form:ĩ3 you may also need to set the parameters and add a filter in order to simulate a specific input file.ġ00 101 A filtergraph is a directed graph of connected filters. TheĤ2 filter takes in input the first unchanged output of theĤ3 split filter (which was labelled as and overlay on itsĤ4 lower half the output generated by the filterchain.Ĥ5 46 Some filters take in input a list of parameters: they are specifiedĤ7 after the filter name and an equal sign, and are separated from each otherĤ9 50 There exist so-called filters} that do not have anĥ1 audio/video input, and filters} that will not have audio/videoĥ8 59 The program included in the FFmpeg directory can be used to parse a filtergraph description and issue aĦ1 corresponding textual representation in the dot language.Ħ7 68 to see how to use 70 You can then pass the dot description to the program (fromħ1 the graphviz suite of programs) and obtain a graphical representationħ3 74 For example the sequence of commands:Ĩ1 82 can be used to create and display an image representing the graphĨ3 described by the string. In theģ6 example, the split filter generates two outputs that are associated toģ7 the labels and 39 The stream sent to the second output of labelled asĤ0 is processed through the filter, which cropsĤ1 away the lower half part of the video, and then vertically flipped. The points where the linearģ5 chains join are labelled by names enclosed in square brackets. In our example,ģ4 are separately in another. You can use theĢ3 24 ffmpeg -i INPUT -vf "split crop=iw:ih/2:0:0, vflip overlay=0:H/2" OUTPUTĢ7 28 The result will be that the top half of the video is mirroredĢ9 onto the bottom half of the output video.ģ0 31 Filters in the same linear chain are separated by commas, and distinctģ2 linear chains of filters are separated by semicolons. See also the latest Fossies "Diffs" side-by-side code changes report for "filters.texi": 1.4_vs_1.5.Ī hint: This file contains one or more very long lines, so maybe it is better readable using the pure text view mode that shows the contents as wrapped lines within the browser window.ģ 4 Filtering in FFmpeg is enabled through the libavfilter library.ĥ 6 In libavfilter, a filter can have multiple inputs and multipleĨ To illustrate the sorts of things that are possible, we consider theġ3 input -> split -> overlay -> outputġ8 19 This filtergraph splits the input stream in two streams, then sends oneĢ0 stream through the crop filter and the vflip filter, before merging itĢ1 back with the other stream by overlaying it on top. As a special service "Fossies" has tried to format the requested text file into HTML format (style: standard) with prefixed line numbers.Īlternatively you can here view or download the uninterpreted source code file.
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