457 lines
14 KiB
JavaScript
457 lines
14 KiB
JavaScript
/*jshint node:true*/
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'use strict';
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var fs = require('fs');
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var path = require('path');
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var PassThrough = require('stream').PassThrough;
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var async = require('../async');
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var utils = require('./utils');
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/*
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* Useful recipes for commands
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*/
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module.exports = function recipes(proto) {
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/**
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* Execute ffmpeg command and save output to a file
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*
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* @method FfmpegCommand#save
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* @category Processing
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* @aliases saveToFile
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*
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* @param {String} output file path
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* @return FfmpegCommand
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*/
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proto.saveToFile =
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proto.save = function (output) {
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this.output(output).run();
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return this;
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};
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/**
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* Execute ffmpeg command and save output to a stream
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*
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* If 'stream' is not specified, a PassThrough stream is created and returned.
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* 'options' will be used when piping ffmpeg output to the output stream
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* (@see http://nodejs.org/api/stream.html#stream_readable_pipe_destination_options)
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*
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* @method FfmpegCommand#pipe
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* @category Processing
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* @aliases stream,writeToStream
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*
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* @param {stream.Writable} [stream] output stream
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* @param {Object} [options={}] pipe options
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* @return Output stream
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*/
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proto.writeToStream =
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proto.pipe =
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proto.stream = function (stream, options) {
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if (stream && !('writable' in stream)) {
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options = stream;
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stream = undefined;
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}
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if (!stream) {
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if (process.version.match(/v0\.8\./)) {
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throw new Error('PassThrough stream is not supported on node v0.8');
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}
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stream = new PassThrough();
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}
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this.output(stream, options).run();
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return stream;
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};
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/**
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* Generate images from a video
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*
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* Note: this method makes the command emit a 'filenames' event with an array of
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* the generated image filenames.
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*
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* @method FfmpegCommand#screenshots
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* @category Processing
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* @aliases takeScreenshots,thumbnail,thumbnails,screenshot
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*
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* @param {Number|Object} [config=1] screenshot count or configuration object with
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* the following keys:
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* @param {Number} [config.count] number of screenshots to take; using this option
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* takes screenshots at regular intervals (eg. count=4 would take screens at 20%, 40%,
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* 60% and 80% of the video length).
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* @param {String} [config.folder='.'] output folder
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* @param {String} [config.filename='tn.png'] output filename pattern, may contain the following
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* tokens:
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* - '%s': offset in seconds
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* - '%w': screenshot width
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* - '%h': screenshot height
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* - '%r': screenshot resolution (same as '%wx%h')
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* - '%f': input filename
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* - '%b': input basename (filename w/o extension)
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* - '%i': index of screenshot in timemark array (can be zero-padded by using it like `%000i`)
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* @param {Number[]|String[]} [config.timemarks] array of timemarks to take screenshots
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* at; each timemark may be a number of seconds, a '[[hh:]mm:]ss[.xxx]' string or a
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* 'XX%' string. Overrides 'count' if present.
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* @param {Number[]|String[]} [config.timestamps] alias for 'timemarks'
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* @param {Boolean} [config.fastSeek] use fast seek (less accurate)
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* @param {String} [config.size] screenshot size, with the same syntax as {@link FfmpegCommand#size}
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* @param {String} [folder] output folder (legacy alias for 'config.folder')
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* @return FfmpegCommand
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*/
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proto.takeScreenshots =
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proto.thumbnail =
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proto.thumbnails =
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proto.screenshot =
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proto.screenshots = function (config, folder) {
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var self = this;
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var source = this._currentInput.source;
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config = config || { count: 1 };
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// Accept a number of screenshots instead of a config object
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if (typeof config === 'number') {
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config = {
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count: config
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};
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}
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// Accept a second 'folder' parameter instead of config.folder
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if (!('folder' in config)) {
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config.folder = folder || '.';
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}
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// Accept 'timestamps' instead of 'timemarks'
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if ('timestamps' in config) {
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config.timemarks = config.timestamps;
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}
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// Compute timemarks from count if not present
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if (!('timemarks' in config)) {
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if (!config.count) {
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throw new Error('Cannot take screenshots: neither a count nor a timemark list are specified');
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}
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var interval = 100 / (1 + config.count);
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config.timemarks = [];
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for (var i = 0; i < config.count; i++) {
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config.timemarks.push((interval * (i + 1)) + '%');
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}
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}
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// Parse size option
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if ('size' in config) {
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var fixedSize = config.size.match(/^(\d+)x(\d+)$/);
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var fixedWidth = config.size.match(/^(\d+)x\?$/);
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var fixedHeight = config.size.match(/^\?x(\d+)$/);
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var percentSize = config.size.match(/^(\d+)%$/);
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if (!fixedSize && !fixedWidth && !fixedHeight && !percentSize) {
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throw new Error('Invalid size parameter: ' + config.size);
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}
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}
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// Metadata helper
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var metadata;
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function getMetadata(cb) {
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if (metadata) {
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cb(null, metadata);
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} else {
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self.ffprobe(function (err, meta) {
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metadata = meta;
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cb(err, meta);
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});
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}
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}
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async.waterfall([
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// Compute percent timemarks if any
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function computeTimemarks(next) {
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if (config.timemarks.some(function (t) { return ('' + t).match(/^[\d.]+%$/); })) {
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if (typeof source !== 'string') {
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return next(new Error('Cannot compute screenshot timemarks with an input stream, please specify fixed timemarks'));
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}
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getMetadata(function (err, meta) {
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if (err) {
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next(err);
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} else {
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// Select video stream with the highest resolution
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var vstream = meta.streams.reduce(function (biggest, stream) {
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if (stream.codec_type === 'video' && stream.width * stream.height > biggest.width * biggest.height) {
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return stream;
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} else {
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return biggest;
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}
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}, { width: 0, height: 0 });
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if (vstream.width === 0) {
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return next(new Error('No video stream in input, cannot take screenshots'));
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}
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var duration = Number(vstream.duration);
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if (isNaN(duration)) {
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duration = Number(meta.format.duration);
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}
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if (isNaN(duration)) {
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return next(new Error('Could not get input duration, please specify fixed timemarks'));
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}
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config.timemarks = config.timemarks.map(function (mark) {
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if (('' + mark).match(/^([\d.]+)%$/)) {
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return duration * parseFloat(mark) / 100;
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} else {
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return mark;
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}
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});
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next();
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}
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});
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} else {
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next();
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}
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},
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// Turn all timemarks into numbers and sort them
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function normalizeTimemarks(next) {
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config.timemarks = config.timemarks.map(function (mark) {
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return utils.timemarkToSeconds(mark);
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}).sort(function (a, b) { return a - b; });
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next();
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},
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// Add '_%i' to pattern when requesting multiple screenshots and no variable token is present
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function fixPattern(next) {
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var pattern = config.filename || 'tn.png';
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if (pattern.indexOf('.') === -1) {
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pattern += '.png';
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}
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if (config.timemarks.length > 1 && !pattern.match(/%(s|0*i)/)) {
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var ext = path.extname(pattern);
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pattern = path.join(path.dirname(pattern), path.basename(pattern, ext) + '_%i' + ext);
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}
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next(null, pattern);
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},
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// Replace filename tokens (%f, %b) in pattern
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function replaceFilenameTokens(pattern, next) {
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if (pattern.match(/%[bf]/)) {
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if (typeof source !== 'string') {
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return next(new Error('Cannot replace %f or %b when using an input stream'));
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}
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pattern = pattern
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.replace(/%f/g, path.basename(source))
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.replace(/%b/g, path.basename(source, path.extname(source)));
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}
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next(null, pattern);
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},
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// Compute size if needed
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function getSize(pattern, next) {
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if (pattern.match(/%[whr]/)) {
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if (fixedSize) {
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return next(null, pattern, fixedSize[1], fixedSize[2]);
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}
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getMetadata(function (err, meta) {
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if (err) {
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return next(new Error('Could not determine video resolution to replace %w, %h or %r'));
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}
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var vstream = meta.streams.reduce(function (biggest, stream) {
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if (stream.codec_type === 'video' && stream.width * stream.height > biggest.width * biggest.height) {
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return stream;
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} else {
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return biggest;
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}
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}, { width: 0, height: 0 });
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if (vstream.width === 0) {
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return next(new Error('No video stream in input, cannot replace %w, %h or %r'));
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}
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var width = vstream.width;
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var height = vstream.height;
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if (fixedWidth) {
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height = height * Number(fixedWidth[1]) / width;
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width = Number(fixedWidth[1]);
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} else if (fixedHeight) {
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width = width * Number(fixedHeight[1]) / height;
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height = Number(fixedHeight[1]);
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} else if (percentSize) {
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width = width * Number(percentSize[1]) / 100;
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height = height * Number(percentSize[1]) / 100;
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}
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next(null, pattern, Math.round(width / 2) * 2, Math.round(height / 2) * 2);
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});
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} else {
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next(null, pattern, -1, -1);
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}
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},
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// Replace size tokens (%w, %h, %r) in pattern
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function replaceSizeTokens(pattern, width, height, next) {
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pattern = pattern
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.replace(/%r/g, '%wx%h')
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.replace(/%w/g, width)
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.replace(/%h/g, height);
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next(null, pattern);
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},
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// Replace variable tokens in pattern (%s, %i) and generate filename list
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function replaceVariableTokens(pattern, next) {
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var filenames = config.timemarks.map(function (t, i) {
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return pattern
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.replace(/%s/g, utils.timemarkToSeconds(t))
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.replace(/%(0*)i/g, function (match, padding) {
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var idx = '' + (i + 1);
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return padding.substr(0, Math.max(0, padding.length + 1 - idx.length)) + idx;
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});
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});
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self.emit('filenames', filenames);
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next(null, filenames);
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},
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// Create output directory
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function createDirectory(filenames, next) {
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fs.exists(config.folder, function (exists) {
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if (!exists) {
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fs.mkdir(config.folder, function (err) {
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if (err) {
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next(err);
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} else {
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next(null, filenames);
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}
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});
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} else {
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next(null, filenames);
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}
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});
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}
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], function runCommand(err, filenames) {
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if (err) {
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return self.emit('error', err);
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}
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var count = config.timemarks.length;
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var split;
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var filters = [split = {
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filter: 'split',
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options: count,
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outputs: []
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}];
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if ('size' in config) {
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// Set size to generate size filters
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self.size(config.size);
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// Get size filters and chain them with 'sizeN' stream names
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var sizeFilters = self._currentOutput.sizeFilters.get().map(function (f, i) {
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if (i > 0) {
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f.inputs = 'size' + (i - 1);
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}
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f.outputs = 'size' + i;
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return f;
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});
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// Input last size filter output into split filter
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split.inputs = 'size' + (sizeFilters.length - 1);
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// Add size filters in front of split filter
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filters = sizeFilters.concat(filters);
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// Remove size filters
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self._currentOutput.sizeFilters.clear();
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}
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var first = 0;
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for (var i = 0; i < count; i++) {
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var stream = 'screen' + i;
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split.outputs.push(stream);
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if (i === 0) {
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first = config.timemarks[i];
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self.seekInput(first);
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}
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self.output(path.join(config.folder, filenames[i]))
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.frames(1)
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.map(stream);
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if (i > 0) {
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self.seek(config.timemarks[i] - first);
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}
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}
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self.complexFilter(filters);
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self.run();
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});
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return this;
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};
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/**
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* Merge (concatenate) inputs to a single file
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*
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* @method FfmpegCommand#concat
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* @category Processing
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* @aliases concatenate,mergeToFile
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*
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* @param {String|Writable} target output file or writable stream
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* @param {Object} [options] pipe options (only used when outputting to a writable stream)
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* @return FfmpegCommand
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*/
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proto.mergeToFile =
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proto.concatenate =
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proto.concat = function (target, options) {
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// Find out which streams are present in the first non-stream input
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var fileInput = this._inputs.filter(function (input) {
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return !input.isStream;
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})[0];
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var self = this;
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this.ffprobe(this._inputs.indexOf(fileInput), function (err, data) {
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if (err) {
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return self.emit('error', err);
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}
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var hasAudioStreams = data.streams.some(function (stream) {
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return stream.codec_type === 'audio';
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});
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var hasVideoStreams = data.streams.some(function (stream) {
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return stream.codec_type === 'video';
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});
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// Setup concat filter and start processing
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self.output(target, options)
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.complexFilter({
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filter: 'concat',
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options: {
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n: self._inputs.length,
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v: hasVideoStreams ? 1 : 0,
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a: hasAudioStreams ? 1 : 0
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}
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})
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.run();
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});
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return this;
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};
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};
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