server/helpers/ffmpeg-utils.ts

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