fluent-ffmpeg-filters

Extend fluent-ffmpeg with fluent API for adding ffmpeg filters, as listed here.

lib directory contains one file per filter. Each filter module exposes a function that augment the ffmpeg instance.

Here is an example of use with the vstack filter.

``javascript
let ffmpeg = require('fluent-ffmpeg');
const vstack = require('fluent-ffmpeg-filters').vstack;

ffmpeg = vstack(ffmpeg);

ffmpeg('./one.jpg')
.input('./two.jpg')
.vstack()
.input(2)
.shortest(0)
.build()
.applyFilters()
`

$3

These functions are available on each filter.

#### build(): register the filter configuration
The build() function is to be called once the filter function and its configuration function have all been called. Calling build()` registers the filter configuration on the ffmpeg instance.

#### applyFilters(): configure all filters
Apply the configurations of all filters to the ffmpeg instance. Call it only once.