Class Filter<P>

Some of those parts are optional. For example, some filters (sources) have no inputs: These can be represented by instantiating the **Filter class with an empty array [] or null.

const filter = new Filter( null, 'color', {
   color: 'black',
   size: `1920x1080`,
   rate: frameRate,
   duration: '5000'
} );

In the same line, not all filters require parameters, so those can be ommited (or an empty object {} can be passed).

const filter = new Filter( input, 'anullsink' );

When filters have more than one input, an array of streams can be provided. Similarly, by default this module allocates one output stream for each filter. In case a filter outputs more than one though, a fourth parameter can be provided indicating how many output streams should be allocated.

const concatFilter = new Filter(
   [ video1, audio1, video2, audio2 ],
   'concat',
   { n: 2, v: 1, a: 1 },
   2
);

In the example above, the concat filter generates two output streams: one for video, and one for audio (it is always v + a). These can be accessed through the Filter.outputs property, or by destructuring the filter itself.

const video = concatFilter.outputs[ 0 ];
const audio = concatFilter.outputs[ 1 ];
// Or equivalent
const [ video, audio ] = concatFilter;