server/helpers/ffmpeg-utils.ts

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