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43 lines
1.7 KiB
43 lines
1.7 KiB
const gm = require('gm')
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, ffmpeg = require('fluent-ffmpeg')
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, config = require(__dirname+'/../../config.js')
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, uploadDirectory = require(__dirname+'/uploadDirectory.js');
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module.exports = (file, firstFrameOnly=true) => {
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const { thumbSize, ffmpegGifThumbnails } = config.get;
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return new Promise((resolve, reject) => {
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if (ffmpegGifThumbnails && !firstFrameOnly) {
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const thumbSizeFilter = file.geometry.width > file.geometry.height ? `${thumbSize}:-1` : `-1:${thumbSize}`;
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const complexFilters = [
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/* this complex filter scales (resizes), and works some magic to preserve transparency,
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with an additional filter to reduce the aliasing on outlines of transparent parts. */
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`[0:v] scale=${thumbSizeFilter},split [a][b]; [a] palettegen=reserve_transparent=on:transparency_color=ffffff [p]; [b][p] paletteuse`
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];
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ffmpeg(`${uploadDirectory}/file/${file.filename}`)
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.on('end', () => {
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return resolve();
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})
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.on('error', function(err, stdout, stderr) {
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return reject(err);
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})
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.complexFilter(complexFilters)
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.save(`${uploadDirectory}/file/thumb/${file.hash}${file.thumbextension}`);
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} else {
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//[0] for first frame (gifs, etc)
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const thumbnailing = gm(`${uploadDirectory}/file/${file.filename}${firstFrameOnly ? '[0]' : ''}`);
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if (!firstFrameOnly) {
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//try (and fail) to make gm thumbnailing less shit.
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thumbnailing.coalesce();
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}
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thumbnailing.resize(Math.min(thumbSize, file.geometry.width), Math.min(thumbSize, file.geometry.height))
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.write(`${uploadDirectory}/file/thumb/${file.hash}${file.thumbextension}`, function (err) {
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if (err) {
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return reject(err);
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}
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return resolve();
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});
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}
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});
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};
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