What follows the -vf in an ffmpeg command line is a filtergraph description. For instance, in this use of the scale filter, FFmpeg assumes the option name width for the value iw/2, and the name height for the value -1.
For example, in this invocation:įFmpeg assumes the option names in the order they are declared in the source code. To add the print_format and linear filter options, use the syntax:įfmpeg -i input -filter:a loudnorm=print_format=summary:linear=true outputĪs described in section 4.1 Filtergraph syntax, you can omit the option names and = characters, supplying just the values, delimited by : characters.
If you want to specify further filter options, you delimit them with :, then append the name of the next filter option, an = character, and the next value.įor instance, to apply the loudnorm filter to an audio stream, the basic syntax is:įfmpeg -i input -filter:a loudnorm output Briefly, that syntax is to add, after the name of the filter, an = character, then the name of the first filter option, an = character, and the value of that option. When documentation refers to "filter options", or says the "filter accepts the following options", the syntax to use for the options is as described in FFmpeg Filters, section 4.1 Filtergraph syntax. This wiki page is for user contributed examples and tips, and contributions to this page are encouraged. Refer to the FFmpeg filters documentation for more information and examples for each filter. To see what filters are available with your build see ffmpeg -filters.
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