server/helpers/ffmpeg-utils.ts

   1 import * as Promise from 'bluebird'
   2 import * as ffmpeg from 'fluent-ffmpeg'
   3
   4 import { CONFIG } from '../initializers'
   5 import { VideoResolution } from '../../shared/models/videos/video-resolution.enum'
   6
   7 function getVideoFileHeight (path: string) {
   8   return new Promise<number>((res, rej) => {
   9     ffmpeg.ffprobe(path, (err, metadata) => {
  10       if (err) return rej(err)
  11
  12       const videoStream = metadata.streams.find(s => s.codec_type === 'video')
  13       return res(videoStream.height)
  14     })
  15   })
  16 }
  17
  18 function getDurationFromVideoFile (path: string) {
  19   return new Promise<number>((res, rej) => {
  20     ffmpeg.ffprobe(path, (err, metadata) => {
  21       if (err) return rej(err)
  22
  23       return res(Math.floor(metadata.format.duration))
  24     })
  25   })
  26 }
  27
  28 function generateImageFromVideoFile (fromPath: string, folder: string, imageName: string, size: string) {
  29   const options = {
  30     filename: imageName,
  31     count: 1,
  32     folder
  33   }
  34
  35   if (size !== undefined) {
  36     options['size'] = size
  37   }
  38
  39   return new Promise<string>((res, rej) => {
  40     ffmpeg(fromPath)
  41       .on('error', rej)
  42       .on('end', () => res(imageName))
  43       .thumbnail(options)
  44   })
  45 }
  46
  47 type TranscodeOptions = {
  48   inputPath: string
  49   outputPath: string
  50   resolution?: VideoResolution
  51 }
  52
  53 function transcode (options: TranscodeOptions) {
  54   return new Promise<void>((res, rej) => {
  55     let command = ffmpeg(options.inputPath)
  56                     .output(options.outputPath)
  57                     .videoCodec('libx264')
  58                     .outputOption('-threads ' + CONFIG.TRANSCODING.THREADS)
  59                     .outputOption('-movflags faststart')
  60                     // .outputOption('-crf 18')
  61
  62     if (options.resolution !== undefined) {
  63       const size = `?x${options.resolution}` // '?x720' for example
  64       command = command.size(size)
  65     }
  66
  67     command.on('error', rej)
  68            .on('end', res)
  69            .run()
  70   })
  71 }
  72
  73 // ---------------------------------------------------------------------------
  74
  75 export {
  76   getVideoFileHeight,
  77   getDurationFromVideoFile,
  78   generateImageFromVideoFile,
  79   transcode
  80 }