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concat.js
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concat.js
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const addFilter = require('./utils').addFilter;
const registerFilter = require('./utils').registerFilter;
/**
* Augment FfmpegCommand with the concat function.
*
*
* @example
* ffmpeg().concat()
* ... // call filter configuration functions
* .build() // end filter configuration
* ...
* .applyFilters() // called once all filters have been configured
*
* @param {FfmpegCommand} ffmpegCommand The fluent-ffmpeg constructor.
* @return {FfmpegCommand} The ffmpegCommand augmented with the concat function.
*/
function concat(ffmpegCommand) {
registerFilter(ffmpegCommand, 'concat', function() {
return new ConcatFilter(this);
});
return ffmpegCommand;
}
/**
* Class exposing methods to configure the vstack filter in a builder pattern way.
*
* See {@link http://ffmpeg.org/ffmpeg-filters.html#vstack} for a description
* of each configuration option.
*/
class ConcatFilter {
/**
* @param {FfmpegCommand} ffmpegCommand The fluent-ffmpeg constructor.
*/
constructor (ffmpeg) {
this.ffmpeg = ffmpeg;
ConcatFilter.prototype.withN = this.n;
ConcatFilter.prototype.withV = this.v;
ConcatFilter.prototype.withA = this.a;
ConcatFilter.prototype.withUnsafe = this.unsafe;
}
/**
* Set the number of segments. Default is 2.
*
*
* @param val
*/
n(val) {
this._n = val;
return this;
}
/**
* Set the number of output video streams, that is also the number of video
* streams in each segment. Default is 1.
*
*
* @param val
*/
v(val) {
this._v = val;
return this;
}
/**
* Set the number of output audio streams, that is also the number of audio
* streams in each segment. Default is 0.
*
*
* @param val
*/
a(val) {
this._a = val;
return this;
}
/**
* Activate unsafe mode: do not fail if segments have a different format.
*
*
* @param val
*/
unsafe(val) {
this._unsafe = val;
return this;
}
/**
* Creates this filter configuration and registers it in the ffmpeg instance.
* @return {ffmpegCommand} The ffmpeg instance.
*/
build() {
let opt = {};
if (this._n) {
opt['n'] = this._n;
}
if (this._v) {
opt['v'] = this._v;
}
if (this._a) {
opt['a'] = this._a;
}
if (this._unsafe) {
opt['unsafe'] = this._unsafe;
}
addFilter(this.ffmpeg, {
filter: 'concat',
options: opt
});
return this.ffmpeg;
}
}
module.exports.concat = concat;