Split ffmpeg utils with ffprobe utils

16 files changed, 337 insertions, 342 deletions

diff --git a/server/controllers/api/videos/index.ts b/server/controllers/api/videos/index.ts
index b5ff2e72e..e8480d749 100644
--- a/server/controllers/api/videos/index.ts
+++ b/server/controllers/api/videos/index.ts
@@ -16,7 +16,7 @@ import { VideoFilter } from '../../../../shared/models/videos/video-query.type'
 import { auditLoggerFactory, getAuditIdFromRes, VideoAuditView } from '../../../helpers/audit-logger'
 import { resetSequelizeInstance } from '../../../helpers/database-utils'
 import { buildNSFWFilter, createReqFiles, getCountVideos } from '../../../helpers/express-utils'
-import { getMetadataFromFile, getVideoFileFPS, getVideoFileResolution } from '../../../helpers/ffmpeg-utils'
+import { getMetadataFromFile, getVideoFileFPS, getVideoFileResolution } from '../../../helpers/ffprobe-utils'
 import { logger } from '../../../helpers/logger'
 import { getFormattedObjects } from '../../../helpers/utils'
 import { CONFIG } from '../../../initializers/config'
@@ -195,7 +195,7 @@ async function addVideo (req: express.Request, res: express.Response) {
     extname: extname(videoPhysicalFile.filename),
     size: videoPhysicalFile.size,
     videoStreamingPlaylistId: null,
-    metadata: await getMetadataFromFile<any>(videoPhysicalFile.path)
+    metadata: await getMetadataFromFile(videoPhysicalFile.path)
   })
 
   if (videoFile.isAudio()) {
diff --git a/server/helpers/ffmpeg-utils.ts b/server/helpers/ffmpeg-utils.ts
index 66b9d2e44..df3926658 100644
--- a/server/helpers/ffmpeg-utils.ts
+++ b/server/helpers/ffmpeg-utils.ts
@@ -1,201 +1,14 @@
 import * as ffmpeg from 'fluent-ffmpeg'
 import { readFile, remove, writeFile } from 'fs-extra'
 import { dirname, join } from 'path'
-import { VideoFileMetadata } from '@shared/models/videos/video-file-metadata'
-import { getMaxBitrate, getTargetBitrate, VideoResolution } from '../../shared/models/videos'
+import { getTargetBitrate, VideoResolution } from '../../shared/models/videos'
 import { checkFFmpegEncoders } from '../initializers/checker-before-init'
 import { CONFIG } from '../initializers/config'
 import { FFMPEG_NICE, VIDEO_LIVE, VIDEO_TRANSCODING_FPS } from '../initializers/constants'
+import { getAudioStream, getClosestFramerateStandard, getMaxAudioBitrate, getVideoFileFPS } from './ffprobe-utils'
 import { processImage } from './image-utils'
 import { logger } from './logger'
 
-/**
- * A toolbox to play with audio
- */
-namespace audio {
-  export const get = (videoPath: string) => {
-    // without position, ffprobe considers the last input only
-    // we make it consider the first input only
-    // if you pass a file path to pos, then ffprobe acts on that file directly
-    return new Promise<{ absolutePath: string, audioStream?: any }>((res, rej) => {
-
-      function parseFfprobe (err: any, data: ffmpeg.FfprobeData) {
-        if (err) return rej(err)
-
-        if ('streams' in data) {
-          const audioStream = data.streams.find(stream => stream['codec_type'] === 'audio')
-          if (audioStream) {
-            return res({
-              absolutePath: data.format.filename,
-              audioStream
-            })
-          }
-        }
-
-        return res({ absolutePath: data.format.filename })
-      }
-
-      return ffmpeg.ffprobe(videoPath, parseFfprobe)
-    })
-  }
-
-  export namespace bitrate {
-    const baseKbitrate = 384
-
-    const toBits = (kbits: number) => kbits * 8000
-
-    export const aac = (bitrate: number): number => {
-      switch (true) {
-        case bitrate > toBits(baseKbitrate):
-          return baseKbitrate
-
-        default:
-          return -1 // we interpret it as a signal to copy the audio stream as is
-      }
-    }
-
-    export const mp3 = (bitrate: number): number => {
-      /*
-      a 192kbit/sec mp3 doesn't hold as much information as a 192kbit/sec aac.
-      That's why, when using aac, we can go to lower kbit/sec. The equivalences
-      made here are not made to be accurate, especially with good mp3 encoders.
-      */
-      switch (true) {
-        case bitrate <= toBits(192):
-          return 128
-
-        case bitrate <= toBits(384):
-          return 256
-
-        default:
-          return baseKbitrate
-      }
-    }
-  }
-}
-
-function computeResolutionsToTranscode (videoFileResolution: number, type: 'vod' | 'live') {
-  const configResolutions = type === 'vod'
-    ? CONFIG.TRANSCODING.RESOLUTIONS
-    : CONFIG.LIVE.TRANSCODING.RESOLUTIONS
-
-  const resolutionsEnabled: number[] = []
-
-  // Put in the order we want to proceed jobs
-  const resolutions = [
-    VideoResolution.H_NOVIDEO,
-    VideoResolution.H_480P,
-    VideoResolution.H_360P,
-    VideoResolution.H_720P,
-    VideoResolution.H_240P,
-    VideoResolution.H_1080P,
-    VideoResolution.H_4K
-  ]
-
-  for (const resolution of resolutions) {
-    if (configResolutions[resolution + 'p'] === true && videoFileResolution > resolution) {
-      resolutionsEnabled.push(resolution)
-    }
-  }
-
-  return resolutionsEnabled
-}
-
-async function getVideoStreamSize (path: string) {
-  const videoStream = await getVideoStreamFromFile(path)
-
-  return videoStream === null
-    ? { width: 0, height: 0 }
-    : { width: videoStream.width, height: videoStream.height }
-}
-
-async function getVideoStreamCodec (path: string) {
-  const videoStream = await getVideoStreamFromFile(path)
-
-  if (!videoStream) return ''
-
-  const videoCodec = videoStream.codec_tag_string
-
-  const baseProfileMatrix = {
-    High: '6400',
-    Main: '4D40',
-    Baseline: '42E0'
-  }
-
-  let baseProfile = baseProfileMatrix[videoStream.profile]
-  if (!baseProfile) {
-    logger.warn('Cannot get video profile codec of %s.', path, { videoStream })
-    baseProfile = baseProfileMatrix['High'] // Fallback
-  }
-
-  let level = videoStream.level.toString(16)
-  if (level.length === 1) level = `0${level}`
-
-  return `${videoCodec}.${baseProfile}${level}`
-}
-
-async function getAudioStreamCodec (path: string) {
-  const { audioStream } = await audio.get(path)
-
-  if (!audioStream) return ''
-
-  const audioCodec = audioStream.codec_name
-  if (audioCodec === 'aac') return 'mp4a.40.2'
-
-  logger.warn('Cannot get audio codec of %s.', path, { audioStream })
-
-  return 'mp4a.40.2' // Fallback
-}
-
-async function getVideoFileResolution (path: string) {
-  const size = await getVideoStreamSize(path)
-
-  return {
-    videoFileResolution: Math.min(size.height, size.width),
-    isPortraitMode: size.height > size.width
-  }
-}
-
-async function getVideoFileFPS (path: string) {
-  const videoStream = await getVideoStreamFromFile(path)
-  if (videoStream === null) return 0
-
-  for (const key of [ 'avg_frame_rate', 'r_frame_rate' ]) {
-    const valuesText: string = videoStream[key]
-    if (!valuesText) continue
-
-    const [ frames, seconds ] = valuesText.split('/')
-    if (!frames || !seconds) continue
-
-    const result = parseInt(frames, 10) / parseInt(seconds, 10)
-    if (result > 0) return Math.round(result)
-  }
-
-  return 0
-}
-
-async function getMetadataFromFile <T> (path: string, cb = metadata => metadata) {
-  return new Promise<T>((res, rej) => {
-    ffmpeg.ffprobe(path, (err, metadata) => {
-      if (err) return rej(err)
-
-      return res(cb(new VideoFileMetadata(metadata)))
-    })
-  })
-}
-
-async function getVideoFileBitrate (path: string) {
-  return getMetadataFromFile<number>(path, metadata => metadata.format.bit_rate)
-}
-
-function getDurationFromVideoFile (path: string) {
-  return getMetadataFromFile<number>(path, metadata => Math.floor(metadata.format.duration))
-}
-
-function getVideoStreamFromFile (path: string) {
-  return getMetadataFromFile<any>(path, metadata => metadata.streams.find(s => s.codec_type === 'video') || null)
-}
-
 async function generateImageFromVideoFile (fromPath: string, folder: string, imageName: string, size: { width: number, height: number }) {
   const pendingImageName = 'pending-' + imageName
 
@@ -228,6 +41,10 @@ async function generateImageFromVideoFile (fromPath: string, folder: string, ima
   }
 }
 
+// ---------------------------------------------------------------------------
+// Transcode meta function
+// ---------------------------------------------------------------------------
+
 type TranscodeOptionsType = 'hls' | 'quick-transcode' | 'video' | 'merge-audio' | 'only-audio'
 
 interface BaseTranscodeOptions {
@@ -270,72 +87,27 @@ type TranscodeOptions =
   | OnlyAudioTranscodeOptions
   | QuickTranscodeOptions
 
-function transcode (options: TranscodeOptions) {
+const builders: {
+  [ type in TranscodeOptionsType ]: (c: ffmpeg.FfmpegCommand, o?: TranscodeOptions) => Promise<ffmpeg.FfmpegCommand> | ffmpeg.FfmpegCommand
+} = {
+  'quick-transcode': buildQuickTranscodeCommand,
+  'hls': buildHLSVODCommand,
+  'merge-audio': buildAudioMergeCommand,
+  'only-audio': buildOnlyAudioCommand,
+  'video': buildx264Command
+}
+
+async function transcode (options: TranscodeOptions) {
   logger.debug('Will run transcode.', { options })
 
-  return new Promise<void>(async (res, rej) => {
-    try {
-      let command = getFFmpeg(options.inputPath)
-        .output(options.outputPath)
-
-      if (options.type === 'quick-transcode') {
-        command = buildQuickTranscodeCommand(command)
-      } else if (options.type === 'hls') {
-        command = await buildHLSVODCommand(command, options)
-      } else if (options.type === 'merge-audio') {
-        command = await buildAudioMergeCommand(command, options)
-      } else if (options.type === 'only-audio') {
-        command = buildOnlyAudioCommand(command, options)
-      } else {
-        command = await buildx264Command(command, options)
-      }
-
-      command
-        .on('error', (err, stdout, stderr) => {
-          logger.error('Error in transcoding job.', { stdout, stderr })
-          return rej(err)
-        })
-        .on('end', () => {
-          return fixHLSPlaylistIfNeeded(options)
-            .then(() => res())
-            .catch(err => rej(err))
-        })
-        .run()
-    } catch (err) {
-      return rej(err)
-    }
-  })
-}
+  let command = getFFmpeg(options.inputPath)
+    .output(options.outputPath)
 
-async function canDoQuickTranscode (path: string): Promise<boolean> {
-  // NOTE: This could be optimized by running ffprobe only once (but it runs fast anyway)
-  const videoStream = await getVideoStreamFromFile(path)
-  const parsedAudio = await audio.get(path)
-  const fps = await getVideoFileFPS(path)
-  const bitRate = await getVideoFileBitrate(path)
-  const resolution = await getVideoFileResolution(path)
-
-  // check video params
-  if (videoStream == null) return false
-  if (videoStream['codec_name'] !== 'h264') return false
-  if (videoStream['pix_fmt'] !== 'yuv420p') return false
-  if (fps < VIDEO_TRANSCODING_FPS.MIN || fps > VIDEO_TRANSCODING_FPS.MAX) return false
-  if (bitRate > getMaxBitrate(resolution.videoFileResolution, fps, VIDEO_TRANSCODING_FPS)) return false
-
-  // check audio params (if audio stream exists)
-  if (parsedAudio.audioStream) {
-    if (parsedAudio.audioStream['codec_name'] !== 'aac') return false
-
-    const maxAudioBitrate = audio.bitrate['aac'](parsedAudio.audioStream['bit_rate'])
-    if (maxAudioBitrate !== -1 && parsedAudio.audioStream['bit_rate'] > maxAudioBitrate) return false
-  }
+  command = await builders[options.type](command, options)
 
-  return true
-}
+  await runCommand(command)
 
-function getClosestFramerateStandard (fps: number, type: 'HD_STANDARD' | 'STANDARD'): number {
-  return VIDEO_TRANSCODING_FPS[type].slice(0)
-                                    .sort((a, b) => fps % a - fps % b)[0]
+  await fixHLSPlaylistIfNeeded(options)
 }
 
 function convertWebPToJPG (path: string, destination: string): Promise<void> {
@@ -484,12 +256,11 @@ async function hlsPlaylistToFragmentedMP4 (hlsDirectory: string, segmentFiles: s
 }
 
 async function runCommand (command: ffmpeg.FfmpegCommand, onEnd?: Function) {
-  command.run()
-
   return new Promise<string>((res, rej) => {
-    command.on('error', err => {
+    command.on('error', (err, stdout, stderr) => {
       if (onEnd) onEnd()
 
+      logger.error('Error in transcoding job.', { stdout, stderr })
       rej(err)
     })
 
@@ -498,32 +269,23 @@ async function runCommand (command: ffmpeg.FfmpegCommand, onEnd?: Function) {
 
       res()
     })
+
+    command.run()
   })
 }
 
 // ---------------------------------------------------------------------------
 
 export {
-  getVideoStreamCodec,
-  getAudioStreamCodec,
   runLiveMuxing,
   convertWebPToJPG,
   processGIF,
-  getVideoStreamSize,
-  getVideoFileResolution,
-  getMetadataFromFile,
-  getDurationFromVideoFile,
   runLiveTranscoding,
   generateImageFromVideoFile,
   TranscodeOptions,
   TranscodeOptionsType,
   transcode,
-  getVideoFileFPS,
-  computeResolutionsToTranscode,
-  audio,
-  hlsPlaylistToFragmentedMP4,
-  getVideoFileBitrate,
-  canDoQuickTranscode
+  hlsPlaylistToFragmentedMP4
 }
 
 // ---------------------------------------------------------------------------
@@ -595,7 +357,7 @@ async function buildAudioMergeCommand (command: ffmpeg.FfmpegCommand, options: M
   return command
 }
 
-function buildOnlyAudioCommand (command: ffmpeg.FfmpegCommand, options: OnlyAudioTranscodeOptions) {
+function buildOnlyAudioCommand (command: ffmpeg.FfmpegCommand, _options: OnlyAudioTranscodeOptions) {
   command = presetOnlyAudio(command)
 
   return command
@@ -684,7 +446,7 @@ async function presetH264 (command: ffmpeg.FfmpegCommand, input: string, resolut
 
   addDefaultX264Params(localCommand)
 
-  const parsedAudio = await audio.get(input)
+  const parsedAudio = await getAudioStream(input)
 
   if (!parsedAudio.audioStream) {
     localCommand = localCommand.noAudio()
@@ -699,22 +461,16 @@ async function presetH264 (command: ffmpeg.FfmpegCommand, input: string, resolut
 
     const audioCodecName = parsedAudio.audioStream['codec_name']
 
-    if (audio.bitrate[audioCodecName]) {
-      const bitrate = audio.bitrate[audioCodecName](parsedAudio.audioStream['bit_rate'])
-      if (bitrate !== undefined && bitrate !== -1) localCommand = localCommand.audioBitrate(bitrate)
-    }
+    const bitrate = getMaxAudioBitrate(audioCodecName, parsedAudio.bitrate)
+
+    if (bitrate !== undefined && bitrate !== -1) localCommand = localCommand.audioBitrate(bitrate)
   }
 
   if (fps) {
     // Constrained Encoding (VBV)
     // https://slhck.info/video/2017/03/01/rate-control.html
     // https://trac.ffmpeg.org/wiki/Limiting%20the%20output%20bitrate
-    let targetBitrate = getTargetBitrate(resolution, fps, VIDEO_TRANSCODING_FPS)
-
-    // Don't transcode to an higher bitrate than the original file
-    const fileBitrate = await getVideoFileBitrate(input)
-    targetBitrate = Math.min(targetBitrate, fileBitrate)
-
+    const targetBitrate = getTargetBitrate(resolution, fps, VIDEO_TRANSCODING_FPS)
     localCommand = localCommand.outputOptions([ `-maxrate ${targetBitrate}`, `-bufsize ${targetBitrate * 2}` ])
 
     // Keyframe interval of 2 seconds for faster seeking and resolution switching.
diff --git a/server/helpers/ffprobe-utils.ts b/server/helpers/ffprobe-utils.ts
new file mode 100644
index 000000000..6159d3963
--- /dev/null
+++ b/server/helpers/ffprobe-utils.ts
@@ -0,0 +1,249 @@
+import * as ffmpeg from 'fluent-ffmpeg'
+import { VideoFileMetadata } from '@shared/models/videos/video-file-metadata'
+import { getMaxBitrate, VideoResolution } from '../../shared/models/videos'
+import { CONFIG } from '../initializers/config'
+import { VIDEO_TRANSCODING_FPS } from '../initializers/constants'
+import { logger } from './logger'
+
+function ffprobePromise (path: string) {
+  return new Promise<ffmpeg.FfprobeData>((res, rej) => {
+    ffmpeg.ffprobe(path, (err, data) => {
+      if (err) return rej(err)
+
+      return res(data)
+    })
+  })
+}
+
+async function getAudioStream (videoPath: string, existingProbe?: ffmpeg.FfprobeData) {
+  // without position, ffprobe considers the last input only
+  // we make it consider the first input only
+  // if you pass a file path to pos, then ffprobe acts on that file directly
+  const data = existingProbe || await ffprobePromise(videoPath)
+
+  if (Array.isArray(data.streams)) {
+    const audioStream = data.streams.find(stream => stream['codec_type'] === 'audio')
+
+    if (audioStream) {
+      return {
+        absolutePath: data.format.filename,
+        audioStream,
+        bitrate: parseInt(audioStream['bit_rate'] + '', 10)
+      }
+    }
+  }
+
+  return { absolutePath: data.format.filename }
+}
+
+function getMaxAudioBitrate (type: 'aac' | 'mp3' | string, bitrate: number) {
+  const baseKbitrate = 384
+  const toBits = (kbits: number) => kbits * 8000
+
+  if (type === 'aac') {
+    switch (true) {
+      case bitrate > toBits(baseKbitrate):
+        return baseKbitrate
+
+      default:
+        return -1 // we interpret it as a signal to copy the audio stream as is
+    }
+  }
+
+  if (type === 'mp3') {
+    /*
+      a 192kbit/sec mp3 doesn't hold as much information as a 192kbit/sec aac.
+      That's why, when using aac, we can go to lower kbit/sec. The equivalences
+      made here are not made to be accurate, especially with good mp3 encoders.
+      */
+    switch (true) {
+      case bitrate <= toBits(192):
+        return 128
+
+      case bitrate <= toBits(384):
+        return 256
+
+      default:
+        return baseKbitrate
+    }
+  }
+
+  return undefined
+}
+
+async function getVideoStreamSize (path: string, existingProbe?: ffmpeg.FfprobeData) {
+  const videoStream = await getVideoStreamFromFile(path, existingProbe)
+
+  return videoStream === null
+    ? { width: 0, height: 0 }
+    : { width: videoStream.width, height: videoStream.height }
+}
+
+async function getVideoStreamCodec (path: string) {
+  const videoStream = await getVideoStreamFromFile(path)
+
+  if (!videoStream) return ''
+
+  const videoCodec = videoStream.codec_tag_string
+
+  const baseProfileMatrix = {
+    High: '6400',
+    Main: '4D40',
+    Baseline: '42E0'
+  }
+
+  let baseProfile = baseProfileMatrix[videoStream.profile]
+  if (!baseProfile) {
+    logger.warn('Cannot get video profile codec of %s.', path, { videoStream })
+    baseProfile = baseProfileMatrix['High'] // Fallback
+  }
+
+  let level = videoStream.level.toString(16)
+  if (level.length === 1) level = `0${level}`
+
+  return `${videoCodec}.${baseProfile}${level}`
+}
+
+async function getAudioStreamCodec (path: string, existingProbe?: ffmpeg.FfprobeData) {
+  const { audioStream } = await getAudioStream(path, existingProbe)
+
+  if (!audioStream) return ''
+
+  const audioCodec = audioStream.codec_name
+  if (audioCodec === 'aac') return 'mp4a.40.2'
+
+  logger.warn('Cannot get audio codec of %s.', path, { audioStream })
+
+  return 'mp4a.40.2' // Fallback
+}
+
+async function getVideoFileResolution (path: string, existingProbe?: ffmpeg.FfprobeData) {
+  const size = await getVideoStreamSize(path, existingProbe)
+
+  return {
+    videoFileResolution: Math.min(size.height, size.width),
+    isPortraitMode: size.height > size.width
+  }
+}
+
+async function getVideoFileFPS (path: string, existingProbe?: ffmpeg.FfprobeData) {
+  const videoStream = await getVideoStreamFromFile(path, existingProbe)
+  if (videoStream === null) return 0
+
+  for (const key of [ 'avg_frame_rate', 'r_frame_rate' ]) {
+    const valuesText: string = videoStream[key]
+    if (!valuesText) continue
+
+    const [ frames, seconds ] = valuesText.split('/')
+    if (!frames || !seconds) continue
+
+    const result = parseInt(frames, 10) / parseInt(seconds, 10)
+    if (result > 0) return Math.round(result)
+  }
+
+  return 0
+}
+
+async function getMetadataFromFile (path: string, existingProbe?: ffmpeg.FfprobeData) {
+  const metadata = existingProbe || await ffprobePromise(path)
+
+  return new VideoFileMetadata(metadata)
+}
+
+async function getVideoFileBitrate (path: string, existingProbe?: ffmpeg.FfprobeData) {
+  const metadata = await getMetadataFromFile(path, existingProbe)
+
+  return metadata.format.bit_rate as number
+}
+
+async function getDurationFromVideoFile (path: string, existingProbe?: ffmpeg.FfprobeData) {
+  const metadata = await getMetadataFromFile(path, existingProbe)
+
+  return Math.floor(metadata.format.duration)
+}
+
+async function getVideoStreamFromFile (path: string, existingProbe?: ffmpeg.FfprobeData) {
+  const metadata = await getMetadataFromFile(path, existingProbe)
+
+  return metadata.streams.find(s => s.codec_type === 'video') || null
+}
+
+function computeResolutionsToTranscode (videoFileResolution: number, type: 'vod' | 'live') {
+  const configResolutions = type === 'vod'
+    ? CONFIG.TRANSCODING.RESOLUTIONS
+    : CONFIG.LIVE.TRANSCODING.RESOLUTIONS
+
+  const resolutionsEnabled: number[] = []
+
+  // Put in the order we want to proceed jobs
+  const resolutions = [
+    VideoResolution.H_NOVIDEO,
+    VideoResolution.H_480P,
+    VideoResolution.H_360P,
+    VideoResolution.H_720P,
+    VideoResolution.H_240P,
+    VideoResolution.H_1080P,
+    VideoResolution.H_4K
+  ]
+
+  for (const resolution of resolutions) {
+    if (configResolutions[resolution + 'p'] === true && videoFileResolution > resolution) {
+      resolutionsEnabled.push(resolution)
+    }
+  }
+
+  return resolutionsEnabled
+}
+
+async function canDoQuickTranscode (path: string): Promise<boolean> {
+  const probe = await ffprobePromise(path)
+
+  // NOTE: This could be optimized by running ffprobe only once (but it runs fast anyway)
+  const videoStream = await getVideoStreamFromFile(path, probe)
+  const parsedAudio = await getAudioStream(path, probe)
+  const fps = await getVideoFileFPS(path, probe)
+  const bitRate = await getVideoFileBitrate(path, probe)
+  const resolution = await getVideoFileResolution(path, probe)
+
+  // check video params
+  if (videoStream == null) return false
+  if (videoStream['codec_name'] !== 'h264') return false
+  if (videoStream['pix_fmt'] !== 'yuv420p') return false
+  if (fps < VIDEO_TRANSCODING_FPS.MIN || fps > VIDEO_TRANSCODING_FPS.MAX) return false
+  if (bitRate > getMaxBitrate(resolution.videoFileResolution, fps, VIDEO_TRANSCODING_FPS)) return false
+
+  // check audio params (if audio stream exists)
+  if (parsedAudio.audioStream) {
+    if (parsedAudio.audioStream['codec_name'] !== 'aac') return false
+
+    const audioBitrate = parsedAudio.bitrate
+
+    const maxAudioBitrate = getMaxAudioBitrate('aac', audioBitrate)
+    if (maxAudioBitrate !== -1 && audioBitrate > maxAudioBitrate) return false
+  }
+
+  return true
+}
+
+function getClosestFramerateStandard (fps: number, type: 'HD_STANDARD' | 'STANDARD'): number {
+  return VIDEO_TRANSCODING_FPS[type].slice(0)
+                                    .sort((a, b) => fps % a - fps % b)[0]
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+  getVideoStreamCodec,
+  getAudioStreamCodec,
+  getVideoStreamSize,
+  getVideoFileResolution,
+  getMetadataFromFile,
+  getMaxAudioBitrate,
+  getDurationFromVideoFile,
+  getAudioStream,
+  getVideoFileFPS,
+  getClosestFramerateStandard,
+  computeResolutionsToTranscode,
+  getVideoFileBitrate,
+  canDoQuickTranscode
+}
diff --git a/server/initializers/migrations/0075-video-resolutions.ts b/server/initializers/migrations/0075-video-resolutions.ts
index f56c1b2c3..496125adb 100644
--- a/server/initializers/migrations/0075-video-resolutions.ts
+++ b/server/initializers/migrations/0075-video-resolutions.ts
@@ -1,7 +1,7 @@
 import * as Sequelize from 'sequelize'
 import { join } from 'path'
 import { CONFIG } from '../../initializers/config'
-import { getVideoFileResolution } from '../../helpers/ffmpeg-utils'
+import { getVideoFileResolution } from '../../helpers/ffprobe-utils'
 import { readdir, rename } from 'fs-extra'
 
 function up (utils: {
diff --git a/server/lib/hls.ts b/server/lib/hls.ts
index 7aa152638..9ea83f337 100644
--- a/server/lib/hls.ts
+++ b/server/lib/hls.ts
@@ -1,17 +1,17 @@
-import { basename, dirname, join } from 'path'
-import { HLS_STREAMING_PLAYLIST_DIRECTORY, P2P_MEDIA_LOADER_PEER_VERSION } from '../initializers/constants'
 import { close, ensureDir, move, open, outputJSON, pathExists, read, readFile, remove, writeFile } from 'fs-extra'
-import { getVideoStreamSize, getAudioStreamCodec, getVideoStreamCodec } from '../helpers/ffmpeg-utils'
+import { flatten, uniq } from 'lodash'
+import { basename, dirname, join } from 'path'
+import { MVideoWithFile } from '@server/types/models'
 import { sha256 } from '../helpers/core-utils'
-import { VideoStreamingPlaylistModel } from '../models/video/video-streaming-playlist'
+import { getAudioStreamCodec, getVideoStreamCodec, getVideoStreamSize } from '../helpers/ffprobe-utils'
 import { logger } from '../helpers/logger'
 import { doRequest, doRequestAndSaveToFile } from '../helpers/requests'
 import { generateRandomString } from '../helpers/utils'
-import { flatten, uniq } from 'lodash'
-import { VideoFileModel } from '../models/video/video-file'
 import { CONFIG } from '../initializers/config'
+import { HLS_STREAMING_PLAYLIST_DIRECTORY, P2P_MEDIA_LOADER_PEER_VERSION } from '../initializers/constants'
 import { sequelizeTypescript } from '../initializers/database'
-import { MVideoWithFile } from '@server/types/models'
+import { VideoFileModel } from '../models/video/video-file'
+import { VideoStreamingPlaylistModel } from '../models/video/video-streaming-playlist'
 import { getVideoFilename, getVideoFilePath } from './video-paths'
 
 async function updateStreamingPlaylistsInfohashesIfNeeded () {
diff --git a/server/lib/job-queue/handlers/video-file-import.ts b/server/lib/job-queue/handlers/video-file-import.ts
index f9bc3137c..18823ee9c 100644
--- a/server/lib/job-queue/handlers/video-file-import.ts
+++ b/server/lib/job-queue/handlers/video-file-import.ts
@@ -1,15 +1,15 @@
 import * as Bull from 'bull'
-import { logger } from '../../../helpers/logger'
-import { VideoModel } from '../../../models/video/video'
-import { publishNewResolutionIfNeeded } from './video-transcoding'
-import { getVideoFileFPS, getVideoFileResolution } from '../../../helpers/ffmpeg-utils'
 import { copy, stat } from 'fs-extra'
-import { VideoFileModel } from '../../../models/video/video-file'
 import { extname } from 'path'
-import { MVideoFile, MVideoWithFile } from '@server/types/models'
 import { createTorrentAndSetInfoHash } from '@server/helpers/webtorrent'
 import { getVideoFilePath } from '@server/lib/video-paths'
+import { MVideoFile, MVideoWithFile } from '@server/types/models'
 import { VideoFileImportPayload } from '@shared/models'
+import { getVideoFileFPS, getVideoFileResolution } from '../../../helpers/ffprobe-utils'
+import { logger } from '../../../helpers/logger'
+import { VideoModel } from '../../../models/video/video'
+import { VideoFileModel } from '../../../models/video/video-file'
+import { publishNewResolutionIfNeeded } from './video-transcoding'
 
 async function processVideoFileImport (job: Bull.Job) {
   const payload = job.data as VideoFileImportPayload
diff --git a/server/lib/job-queue/handlers/video-import.ts b/server/lib/job-queue/handlers/video-import.ts
index 9210aec54..5a82a8d2b 100644
--- a/server/lib/job-queue/handlers/video-import.ts
+++ b/server/lib/job-queue/handlers/video-import.ts
@@ -17,7 +17,7 @@ import {
 } from '../../../../shared'
 import { VideoImportState } from '../../../../shared/models/videos'
 import { ThumbnailType } from '../../../../shared/models/videos/thumbnail.type'
-import { getDurationFromVideoFile, getVideoFileFPS, getVideoFileResolution } from '../../../helpers/ffmpeg-utils'
+import { getDurationFromVideoFile, getVideoFileFPS, getVideoFileResolution } from '../../../helpers/ffprobe-utils'
 import { logger } from '../../../helpers/logger'
 import { getSecureTorrentName } from '../../../helpers/utils'
 import { createTorrentAndSetInfoHash, downloadWebTorrentVideo } from '../../../helpers/webtorrent'
diff --git a/server/lib/job-queue/handlers/video-live-ending.ts b/server/lib/job-queue/handlers/video-live-ending.ts
index 599aabf80..447744224 100644
--- a/server/lib/job-queue/handlers/video-live-ending.ts
+++ b/server/lib/job-queue/handlers/video-live-ending.ts
@@ -1,7 +1,9 @@
 import * as Bull from 'bull'
 import { readdir, remove } from 'fs-extra'
 import { join } from 'path'
-import { getDurationFromVideoFile, getVideoFileResolution, hlsPlaylistToFragmentedMP4 } from '@server/helpers/ffmpeg-utils'
+import { hlsPlaylistToFragmentedMP4 } from '@server/helpers/ffmpeg-utils'
+import { getDurationFromVideoFile, getVideoFileResolution } from '@server/helpers/ffprobe-utils'
+import { generateVideoMiniature } from '@server/lib/thumbnail'
 import { publishAndFederateIfNeeded } from '@server/lib/video'
 import { getHLSDirectory } from '@server/lib/video-paths'
 import { generateHlsPlaylist } from '@server/lib/video-transcoding'
@@ -12,7 +14,6 @@ import { VideoStreamingPlaylistModel } from '@server/models/video/video-streamin
 import { MStreamingPlaylist, MVideo, MVideoLive } from '@server/types/models'
 import { ThumbnailType, VideoLiveEndingPayload, VideoState } from '@shared/models'
 import { logger } from '../../../helpers/logger'
-import { generateVideoMiniature } from '@server/lib/thumbnail'
 
 async function processVideoLiveEnding (job: Bull.Job) {
   const payload = job.data as VideoLiveEndingPayload
diff --git a/server/lib/job-queue/handlers/video-transcoding.ts b/server/lib/job-queue/handlers/video-transcoding.ts
index 843a9f1b5..b6b8d9071 100644
--- a/server/lib/job-queue/handlers/video-transcoding.ts
+++ b/server/lib/job-queue/handlers/video-transcoding.ts
@@ -9,7 +9,7 @@ import {
   VideoTranscodingPayload
 } from '../../../../shared'
 import { retryTransactionWrapper } from '../../../helpers/database-utils'
-import { computeResolutionsToTranscode } from '../../../helpers/ffmpeg-utils'
+import { computeResolutionsToTranscode } from '../../../helpers/ffprobe-utils'
 import { logger } from '../../../helpers/logger'
 import { CONFIG } from '../../../initializers/config'
 import { sequelizeTypescript } from '../../../initializers/database'
diff --git a/server/lib/live-manager.ts b/server/lib/live-manager.ts
index feb6c5275..4d2e9b1b3 100644
--- a/server/lib/live-manager.ts
+++ b/server/lib/live-manager.ts
@@ -4,13 +4,8 @@ import { FfmpegCommand } from 'fluent-ffmpeg'
 import { ensureDir, stat } from 'fs-extra'
 import { basename } from 'path'
 import { isTestInstance } from '@server/helpers/core-utils'
-import {
-  computeResolutionsToTranscode,
-  getVideoFileFPS,
-  getVideoFileResolution,
-  runLiveMuxing,
-  runLiveTranscoding
-} from '@server/helpers/ffmpeg-utils'
+import { runLiveMuxing, runLiveTranscoding } from '@server/helpers/ffmpeg-utils'
+import { computeResolutionsToTranscode, getVideoFileFPS, getVideoFileResolution } from '@server/helpers/ffprobe-utils'
 import { logger } from '@server/helpers/logger'
 import { CONFIG, registerConfigChangedHandler } from '@server/initializers/config'
 import { MEMOIZE_TTL, P2P_MEDIA_LOADER_PEER_VERSION, VIDEO_LIVE, VIEW_LIFETIME, WEBSERVER } from '@server/initializers/constants'
diff --git a/server/lib/video-transcoding.ts b/server/lib/video-transcoding.ts
index 9882a14db..ca969b235 100644
--- a/server/lib/video-transcoding.ts
+++ b/server/lib/video-transcoding.ts
@@ -4,15 +4,8 @@ import { createTorrentAndSetInfoHash } from '@server/helpers/webtorrent'
 import { MStreamingPlaylistFilesVideo, MVideoFile, MVideoWithAllFiles, MVideoWithFile } from '@server/types/models'
 import { VideoResolution } from '../../shared/models/videos'
 import { VideoStreamingPlaylistType } from '../../shared/models/videos/video-streaming-playlist.type'
-import {
-  canDoQuickTranscode,
-  getDurationFromVideoFile,
-  getMetadataFromFile,
-  getVideoFileFPS,
-  transcode,
-  TranscodeOptions,
-  TranscodeOptionsType
-} from '../helpers/ffmpeg-utils'
+import { transcode, TranscodeOptions, TranscodeOptionsType } from '../helpers/ffmpeg-utils'
+import { canDoQuickTranscode, getDurationFromVideoFile, getMetadataFromFile, getVideoFileFPS } from '../helpers/ffprobe-utils'
 import { logger } from '../helpers/logger'
 import { CONFIG } from '../initializers/config'
 import { HLS_STREAMING_PLAYLIST_DIRECTORY, P2P_MEDIA_LOADER_PEER_VERSION, WEBSERVER } from '../initializers/constants'
diff --git a/server/middlewares/validators/videos/videos.ts b/server/middlewares/validators/videos/videos.ts
index efab67a01..af0072d73 100644
--- a/server/middlewares/validators/videos/videos.ts
+++ b/server/middlewares/validators/videos/videos.ts
@@ -34,7 +34,7 @@ import {
   isVideoTagsValid
 } from '../../../helpers/custom-validators/videos'
 import { cleanUpReqFiles } from '../../../helpers/express-utils'
-import { getDurationFromVideoFile } from '../../../helpers/ffmpeg-utils'
+import { getDurationFromVideoFile } from '../../../helpers/ffprobe-utils'
 import { logger } from '../../../helpers/logger'
 import {
   checkUserCanManageVideo,
diff --git a/server/models/video/video.ts b/server/models/video/video.ts
index f365d3d51..d33ae8a5a 100644
--- a/server/models/video/video.ts
+++ b/server/models/video/video.ts
@@ -51,7 +51,7 @@ import {
   isVideoStateValid,
   isVideoSupportValid
 } from '../../helpers/custom-validators/videos'
-import { getVideoFileResolution } from '../../helpers/ffmpeg-utils'
+import { getVideoFileResolution } from '../../helpers/ffprobe-utils'
 import { logger } from '../../helpers/logger'
 import { CONFIG } from '../../initializers/config'
 import {
diff --git a/server/tests/api/videos/audio-only.ts b/server/tests/api/videos/audio-only.ts
index ac7a0b89c..053b29ca1 100644
--- a/server/tests/api/videos/audio-only.ts
+++ b/server/tests/api/videos/audio-only.ts
@@ -1,7 +1,9 @@
 /* eslint-disable @typescript-eslint/no-unused-expressions,@typescript-eslint/require-await */
 
-import * as chai from 'chai'
 import 'mocha'
+import * as chai from 'chai'
+import { join } from 'path'
+import { getAudioStream, getVideoStreamSize } from '@server/helpers/ffprobe-utils'
 import {
   cleanupTests,
   doubleFollow,
@@ -14,8 +16,6 @@ import {
   waitJobs
 } from '../../../../shared/extra-utils'
 import { VideoDetails } from '../../../../shared/models/videos'
-import { join } from 'path'
-import { audio, getVideoStreamSize } from '@server/helpers/ffmpeg-utils'
 
 const expect = chai.expect
 
@@ -85,7 +85,7 @@ describe('Test audio only video transcoding', function () {
     ]
 
     for (const path of paths) {
-      const { audioStream } = await audio.get(path)
+      const { audioStream } = await getAudioStream(path)
       expect(audioStream['codec_name']).to.be.equal('aac')
       expect(audioStream['bit_rate']).to.be.at.most(384 * 8000)
 
diff --git a/server/tests/api/videos/video-transcoder.ts b/server/tests/api/videos/video-transcoder.ts
index ae21c3716..3e336e786 100644
--- a/server/tests/api/videos/video-transcoder.ts
+++ b/server/tests/api/videos/video-transcoder.ts
@@ -1,17 +1,12 @@
 /* eslint-disable @typescript-eslint/no-unused-expressions,@typescript-eslint/require-await */
 
-import * as chai from 'chai'
 import 'mocha'
+import * as chai from 'chai'
+import { FfprobeData } from 'fluent-ffmpeg'
 import { omit } from 'lodash'
-import { getMaxBitrate, VideoDetails, VideoResolution, VideoState } from '../../../../shared/models/videos'
-import {
-  audio,
-  canDoQuickTranscode,
-  getVideoFileBitrate,
-  getVideoFileFPS,
-  getVideoFileResolution,
-  getMetadataFromFile
-} from '../../../helpers/ffmpeg-utils'
+import { join } from 'path'
+
+import { VIDEO_TRANSCODING_FPS } from '../../../../server/initializers/constants'
 import {
   buildAbsoluteFixturePath,
   cleanupTests,
@@ -29,14 +24,20 @@ import {
   ServerInfo,
   setAccessTokensToServers,
   updateCustomSubConfig,
-  uploadVideo, uploadVideoAndGetId,
+  uploadVideo,
+  uploadVideoAndGetId,
   waitJobs,
   webtorrentAdd
 } from '../../../../shared/extra-utils'
-import { join } from 'path'
-import { VIDEO_TRANSCODING_FPS } from '../../../../server/initializers/constants'
-import { FfprobeData } from 'fluent-ffmpeg'
-import { VideoFileMetadata } from '@shared/models/videos/video-file-metadata'
+import { getMaxBitrate, VideoDetails, VideoResolution, VideoState } from '../../../../shared/models/videos'
+import {
+  canDoQuickTranscode,
+  getAudioStream,
+  getMetadataFromFile,
+  getVideoFileBitrate,
+  getVideoFileFPS,
+  getVideoFileResolution
+} from '../../../helpers/ffprobe-utils'
 
 const expect = chai.expect
 
@@ -136,7 +137,7 @@ describe('Test video transcoding', function () {
       expect(videoDetails.files).to.have.lengthOf(4)
 
       const path = join(root(), 'test' + servers[1].internalServerNumber, 'videos', video.uuid + '-240.mp4')
-      const probe = await audio.get(path)
+      const probe = await getAudioStream(path)
 
       if (probe.audioStream) {
         expect(probe.audioStream['codec_name']).to.be.equal('aac')
@@ -167,7 +168,7 @@ describe('Test video transcoding', function () {
 
       expect(videoDetails.files).to.have.lengthOf(4)
       const path = join(root(), 'test' + servers[1].internalServerNumber, 'videos', video.uuid + '-240.mp4')
-      const probe = await audio.get(path)
+      const probe = await getAudioStream(path)
       expect(probe).to.not.have.property('audioStream')
     }
   })
@@ -192,9 +193,9 @@ describe('Test video transcoding', function () {
 
       expect(videoDetails.files).to.have.lengthOf(4)
       const fixturePath = buildAbsoluteFixturePath(videoAttributes.fixture)
-      const fixtureVideoProbe = await audio.get(fixturePath)
+      const fixtureVideoProbe = await getAudioStream(fixturePath)
       const path = join(root(), 'test' + servers[1].internalServerNumber, 'videos', video.uuid + '-240.mp4')
-      const videoProbe = await audio.get(path)
+      const videoProbe = await getAudioStream(path)
       if (videoProbe.audioStream && fixtureVideoProbe.audioStream) {
         const toOmit = [ 'max_bit_rate', 'duration', 'duration_ts', 'nb_frames', 'start_time', 'start_pts' ]
         expect(omit(videoProbe.audioStream, toOmit)).to.be.deep.equal(omit(fixtureVideoProbe.audioStream, toOmit))
@@ -513,7 +514,7 @@ describe('Test video transcoding', function () {
 
     {
       const path = join(root(), 'test' + servers[1].internalServerNumber, 'videos', videoUUID + '-240.mp4')
-      const metadata = await getMetadataFromFile<VideoFileMetadata>(path)
+      const metadata = await getMetadataFromFile(path)
 
       // expected format properties
       for (const p of [
diff --git a/server/tests/cli/optimize-old-videos.ts b/server/tests/cli/optimize-old-videos.ts
index 43f9b7f55..420fb8049 100644
--- a/server/tests/cli/optimize-old-videos.ts
+++ b/server/tests/cli/optimize-old-videos.ts
@@ -2,7 +2,7 @@
 
 import 'mocha'
 import * as chai from 'chai'
-import { getMaxBitrate, Video, VideoDetails, VideoResolution } from '../../../shared/models/videos'
+import { join } from 'path'
 import {
   cleanupTests,
   doubleFollow,
@@ -20,9 +20,9 @@ import {
   wait
 } from '../../../shared/extra-utils'
 import { waitJobs } from '../../../shared/extra-utils/server/jobs'
-import { getVideoFileBitrate, getVideoFileFPS, getVideoFileResolution } from '../../helpers/ffmpeg-utils'
+import { getMaxBitrate, Video, VideoDetails, VideoResolution } from '../../../shared/models/videos'
+import { getVideoFileBitrate, getVideoFileFPS, getVideoFileResolution } from '../../helpers/ffprobe-utils'
 import { VIDEO_TRANSCODING_FPS } from '../../initializers/constants'
-import { join } from 'path'
 
 const expect = chai.expect