server/helpers/ffmpeg-utils.ts

   1 import { Job } from 'bull'
   2 import * as ffmpeg from 'fluent-ffmpeg'
   3 import { readFile, remove, writeFile } from 'fs-extra'
   4 import { dirname, join } from 'path'
   5 import { FFMPEG_NICE, VIDEO_LIVE } from '@server/initializers/constants'
   6 import { AvailableEncoders, EncoderOptions, EncoderOptionsBuilder, EncoderProfile, VideoResolution } from '../../shared/models/videos'
   7 import { CONFIG } from '../initializers/config'
   8 import { execPromise, promisify0 } from './core-utils'
   9 import { computeFPS, getAudioStream, getVideoFileFPS } from './ffprobe-utils'
  10 import { processImage } from './image-utils'
  11 import { logger } from './logger'
  12
  13 /**
  14  *
  15  * Functions that run transcoding/muxing ffmpeg processes
  16  * Mainly called by lib/video-transcoding.ts and lib/live-manager.ts
  17  *
  18  */
  19
  20 // ---------------------------------------------------------------------------
  21 // Encoder options
  22 // ---------------------------------------------------------------------------
  23
  24 type StreamType = 'audio' | 'video'
  25
  26 // ---------------------------------------------------------------------------
  27 // Encoders support
  28 // ---------------------------------------------------------------------------
  29
  30 // Detect supported encoders by ffmpeg
  31 let supportedEncoders: Map<string, boolean>
  32 async function checkFFmpegEncoders (peertubeAvailableEncoders: AvailableEncoders): Promise<Map<string, boolean>> {
  33   if (supportedEncoders !== undefined) {
  34     return supportedEncoders
  35   }
  36
  37   const getAvailableEncodersPromise = promisify0(ffmpeg.getAvailableEncoders)
  38   const availableFFmpegEncoders = await getAvailableEncodersPromise()
  39
  40   const searchEncoders = new Set<string>()
  41   for (const type of [ 'live', 'vod' ]) {
  42     for (const streamType of [ 'audio', 'video' ]) {
  43       for (const encoder of peertubeAvailableEncoders.encodersToTry[type][streamType]) {
  44         searchEncoders.add(encoder)
  45       }
  46     }
  47   }
  48
  49   supportedEncoders = new Map<string, boolean>()
  50
  51   for (const searchEncoder of searchEncoders) {
  52     supportedEncoders.set(searchEncoder, availableFFmpegEncoders[searchEncoder] !== undefined)
  53   }
  54
  55   logger.info('Built supported ffmpeg encoders.', { supportedEncoders, searchEncoders })
  56
  57   return supportedEncoders
  58 }
  59
  60 function resetSupportedEncoders () {
  61   supportedEncoders = undefined
  62 }
  63
  64 // ---------------------------------------------------------------------------
  65 // Image manipulation
  66 // ---------------------------------------------------------------------------
  67
  68 function convertWebPToJPG (path: string, destination: string): Promise<void> {
  69   const command = ffmpeg(path, { niceness: FFMPEG_NICE.THUMBNAIL })
  70     .output(destination)
  71
  72   return runCommand({ command, silent: true })
  73 }
  74
  75 function processGIF (
  76   path: string,
  77   destination: string,
  78   newSize: { width: number, height: number }
  79 ): Promise<void> {
  80   const command = ffmpeg(path, { niceness: FFMPEG_NICE.THUMBNAIL })
  81     .fps(20)
  82     .size(`${newSize.width}x${newSize.height}`)
  83     .output(destination)
  84
  85   return runCommand({ command })
  86 }
  87
  88 async function generateImageFromVideoFile (fromPath: string, folder: string, imageName: string, size: { width: number, height: number }) {
  89   const pendingImageName = 'pending-' + imageName
  90
  91   const options = {
  92     filename: pendingImageName,
  93     count: 1,
  94     folder
  95   }
  96
  97   const pendingImagePath = join(folder, pendingImageName)
  98
  99   try {
 100     await new Promise<string>((res, rej) => {
 101       ffmpeg(fromPath, { niceness: FFMPEG_NICE.THUMBNAIL })
 102         .on('error', rej)
 103         .on('end', () => res(imageName))
 104         .thumbnail(options)
 105     })
 106
 107     const destination = join(folder, imageName)
 108     await processImage(pendingImagePath, destination, size)
 109   } catch (err) {
 110     logger.error('Cannot generate image from video %s.', fromPath, { err })
 111
 112     try {
 113       await remove(pendingImagePath)
 114     } catch (err) {
 115       logger.debug('Cannot remove pending image path after generation error.', { err })
 116     }
 117   }
 118 }
 119
 120 // ---------------------------------------------------------------------------
 121 // Transcode meta function
 122 // ---------------------------------------------------------------------------
 123
 124 type TranscodeOptionsType = 'hls' | 'hls-from-ts' | 'quick-transcode' | 'video' | 'merge-audio' | 'only-audio'
 125
 126 interface BaseTranscodeOptions {
 127   type: TranscodeOptionsType
 128
 129   inputPath: string
 130   outputPath: string
 131
 132   availableEncoders: AvailableEncoders
 133   profile: string
 134
 135   resolution: number
 136
 137   isPortraitMode?: boolean
 138
 139   job?: Job
 140 }
 141
 142 interface HLSTranscodeOptions extends BaseTranscodeOptions {
 143   type: 'hls'
 144   copyCodecs: boolean
 145   hlsPlaylist: {
 146     videoFilename: string
 147   }
 148 }
 149
 150 interface HLSFromTSTranscodeOptions extends BaseTranscodeOptions {
 151   type: 'hls-from-ts'
 152
 153   isAAC: boolean
 154
 155   hlsPlaylist: {
 156     videoFilename: string
 157   }
 158 }
 159
 160 interface QuickTranscodeOptions extends BaseTranscodeOptions {
 161   type: 'quick-transcode'
 162 }
 163
 164 interface VideoTranscodeOptions extends BaseTranscodeOptions {
 165   type: 'video'
 166 }
 167
 168 interface MergeAudioTranscodeOptions extends BaseTranscodeOptions {
 169   type: 'merge-audio'
 170   audioPath: string
 171 }
 172
 173 interface OnlyAudioTranscodeOptions extends BaseTranscodeOptions {
 174   type: 'only-audio'
 175 }
 176
 177 type TranscodeOptions =
 178   HLSTranscodeOptions
 179   | HLSFromTSTranscodeOptions
 180   | VideoTranscodeOptions
 181   | MergeAudioTranscodeOptions
 182   | OnlyAudioTranscodeOptions
 183   | QuickTranscodeOptions
 184
 185 const builders: {
 186   [ type in TranscodeOptionsType ]: (c: ffmpeg.FfmpegCommand, o?: TranscodeOptions) => Promise<ffmpeg.FfmpegCommand> | ffmpeg.FfmpegCommand
 187 } = {
 188   'quick-transcode': buildQuickTranscodeCommand,
 189   'hls': buildHLSVODCommand,
 190   'hls-from-ts': buildHLSVODFromTSCommand,
 191   'merge-audio': buildAudioMergeCommand,
 192   'only-audio': buildOnlyAudioCommand,
 193   'video': buildx264VODCommand
 194 }
 195
 196 async function transcode (options: TranscodeOptions) {
 197   logger.debug('Will run transcode.', { options })
 198
 199   let command = getFFmpeg(options.inputPath, 'vod')
 200     .output(options.outputPath)
 201
 202   command = await builders[options.type](command, options)
 203
 204   await runCommand({ command, job: options.job })
 205
 206   await fixHLSPlaylistIfNeeded(options)
 207 }
 208
 209 // ---------------------------------------------------------------------------
 210 // Live muxing/transcoding functions
 211 // ---------------------------------------------------------------------------
 212
 213 async function getLiveTranscodingCommand (options: {
 214   rtmpUrl: string
 215   outPath: string
 216   resolutions: number[]
 217   fps: number
 218
 219   availableEncoders: AvailableEncoders
 220   profile: string
 221 }) {
 222   const { rtmpUrl, outPath, resolutions, fps, availableEncoders, profile } = options
 223   const input = rtmpUrl
 224
 225   const command = getFFmpeg(input, 'live')
 226
 227   const varStreamMap: string[] = []
 228
 229   const complexFilter: ffmpeg.FilterSpecification[] = [
 230     {
 231       inputs: '[v:0]',
 232       filter: 'split',
 233       options: resolutions.length,
 234       outputs: resolutions.map(r => `vtemp${r}`)
 235     }
 236   ]
 237
 238   command.outputOption('-sc_threshold 0')
 239
 240   addDefaultEncoderGlobalParams({ command })
 241
 242   for (let i = 0; i < resolutions.length; i++) {
 243     const resolution = resolutions[i]
 244     const resolutionFPS = computeFPS(fps, resolution)
 245
 246     const baseEncoderBuilderParams = {
 247       input,
 248
 249       availableEncoders,
 250       profile,
 251
 252       fps: resolutionFPS,
 253       resolution,
 254       streamNum: i,
 255       videoType: 'live' as 'live'
 256     }
 257
 258     {
 259       const streamType: StreamType = 'video'
 260       const builderResult = await getEncoderBuilderResult(Object.assign({}, baseEncoderBuilderParams, { streamType }))
 261       if (!builderResult) {
 262         throw new Error('No available live video encoder found')
 263       }
 264
 265       command.outputOption(`-map [vout${resolution}]`)
 266
 267       addDefaultEncoderParams({ command, encoder: builderResult.encoder, fps: resolutionFPS, streamNum: i })
 268
 269       logger.debug('Apply ffmpeg live video params from %s using %s profile.', builderResult.encoder, profile, builderResult)
 270
 271       command.outputOption(`${buildStreamSuffix('-c:v', i)} ${builderResult.encoder}`)
 272       applyEncoderOptions(command, builderResult.result)
 273
 274       complexFilter.push({
 275         inputs: `vtemp${resolution}`,
 276         filter: getScaleFilter(builderResult.result),
 277         options: `w=-2:h=${resolution}`,
 278         outputs: `vout${resolution}`
 279       })
 280     }
 281
 282     {
 283       const streamType: StreamType = 'audio'
 284       const builderResult = await getEncoderBuilderResult(Object.assign({}, baseEncoderBuilderParams, { streamType }))
 285       if (!builderResult) {
 286         throw new Error('No available live audio encoder found')
 287       }
 288
 289       command.outputOption('-map a:0')
 290
 291       addDefaultEncoderParams({ command, encoder: builderResult.encoder, fps: resolutionFPS, streamNum: i })
 292
 293       logger.debug('Apply ffmpeg live audio params from %s using %s profile.', builderResult.encoder, profile, builderResult)
 294
 295       command.outputOption(`${buildStreamSuffix('-c:a', i)} ${builderResult.encoder}`)
 296       applyEncoderOptions(command, builderResult.result)
 297     }
 298
 299     varStreamMap.push(`v:${i},a:${i}`)
 300   }
 301
 302   command.complexFilter(complexFilter)
 303
 304   addDefaultLiveHLSParams(command, outPath)
 305
 306   command.outputOption('-var_stream_map', varStreamMap.join(' '))
 307
 308   return command
 309 }
 310
 311 function getLiveMuxingCommand (rtmpUrl: string, outPath: string) {
 312   const command = getFFmpeg(rtmpUrl, 'live')
 313
 314   command.outputOption('-c:v copy')
 315   command.outputOption('-c:a copy')
 316   command.outputOption('-map 0:a?')
 317   command.outputOption('-map 0:v?')
 318
 319   addDefaultLiveHLSParams(command, outPath)
 320
 321   return command
 322 }
 323
 324 function buildStreamSuffix (base: string, streamNum?: number) {
 325   if (streamNum !== undefined) {
 326     return `${base}:${streamNum}`
 327   }
 328
 329   return base
 330 }
 331
 332 // ---------------------------------------------------------------------------
 333 // Default options
 334 // ---------------------------------------------------------------------------
 335
 336 function addDefaultEncoderGlobalParams (options: {
 337   command: ffmpeg.FfmpegCommand
 338 }) {
 339   const { command } = options
 340
 341   // avoid issues when transcoding some files: https://trac.ffmpeg.org/ticket/6375
 342   command.outputOption('-max_muxing_queue_size 1024')
 343          // strip all metadata
 344          .outputOption('-map_metadata -1')
 345          // NOTE: b-strategy 1 - heuristic algorithm, 16 is optimal B-frames for it
 346          .outputOption('-b_strategy 1')
 347          // NOTE: Why 16: https://github.com/Chocobozzz/PeerTube/pull/774. b-strategy 2 -> B-frames<16
 348          .outputOption('-bf 16')
 349          // allows import of source material with incompatible pixel formats (e.g. MJPEG video)
 350          .outputOption('-pix_fmt yuv420p')
 351 }
 352
 353 function addDefaultEncoderParams (options: {
 354   command: ffmpeg.FfmpegCommand
 355   encoder: 'libx264' | string
 356   streamNum?: number
 357   fps?: number
 358 }) {
 359   const { command, encoder, fps, streamNum } = options
 360
 361   if (encoder === 'libx264') {
 362     // 3.1 is the minimal resource allocation for our highest supported resolution
 363     command.outputOption(buildStreamSuffix('-level:v', streamNum) + ' 3.1')
 364
 365     if (fps) {
 366       // Keyframe interval of 2 seconds for faster seeking and resolution switching.
 367       // https://streaminglearningcenter.com/blogs/whats-the-right-keyframe-interval.html
 368       // https://superuser.com/a/908325
 369       command.outputOption(buildStreamSuffix('-g:v', streamNum) + ' ' + (fps * 2))
 370     }
 371   }
 372 }
 373
 374 function addDefaultLiveHLSParams (command: ffmpeg.FfmpegCommand, outPath: string) {
 375   command.outputOption('-hls_time ' + VIDEO_LIVE.SEGMENT_TIME_SECONDS)
 376   command.outputOption('-hls_list_size ' + VIDEO_LIVE.SEGMENTS_LIST_SIZE)
 377   command.outputOption('-hls_flags delete_segments+independent_segments')
 378   command.outputOption(`-hls_segment_filename ${join(outPath, '%v-%06d.ts')}`)
 379   command.outputOption('-master_pl_name master.m3u8')
 380   command.outputOption(`-f hls`)
 381
 382   command.output(join(outPath, '%v.m3u8'))
 383 }
 384
 385 // ---------------------------------------------------------------------------
 386 // Transcode VOD command builders
 387 // ---------------------------------------------------------------------------
 388
 389 async function buildx264VODCommand (command: ffmpeg.FfmpegCommand, options: TranscodeOptions) {
 390   let fps = await getVideoFileFPS(options.inputPath)
 391   fps = computeFPS(fps, options.resolution)
 392
 393   let scaleFilterValue: string
 394
 395   if (options.resolution !== undefined) {
 396     scaleFilterValue = options.isPortraitMode === true
 397       ? `w=${options.resolution}:h=-2`
 398       : `w=-2:h=${options.resolution}`
 399   }
 400
 401   command = await presetVideo({ command, input: options.inputPath, transcodeOptions: options, fps, scaleFilterValue })
 402
 403   return command
 404 }
 405
 406 async function buildAudioMergeCommand (command: ffmpeg.FfmpegCommand, options: MergeAudioTranscodeOptions) {
 407   command = command.loop(undefined)
 408
 409   const scaleFilterValue = getScaleCleanerValue()
 410   command = await presetVideo({ command, input: options.audioPath, transcodeOptions: options, scaleFilterValue })
 411
 412   command.outputOption('-preset:v veryfast')
 413
 414   command = command.input(options.audioPath)
 415                    .outputOption('-tune stillimage')
 416                    .outputOption('-shortest')
 417
 418   return command
 419 }
 420
 421 function buildOnlyAudioCommand (command: ffmpeg.FfmpegCommand, _options: OnlyAudioTranscodeOptions) {
 422   command = presetOnlyAudio(command)
 423
 424   return command
 425 }
 426
 427 function buildQuickTranscodeCommand (command: ffmpeg.FfmpegCommand) {
 428   command = presetCopy(command)
 429
 430   command = command.outputOption('-map_metadata -1') // strip all metadata
 431                    .outputOption('-movflags faststart')
 432
 433   return command
 434 }
 435
 436 function addCommonHLSVODCommandOptions (command: ffmpeg.FfmpegCommand, outputPath: string) {
 437   return command.outputOption('-hls_time 4')
 438                 .outputOption('-hls_list_size 0')
 439                 .outputOption('-hls_playlist_type vod')
 440                 .outputOption('-hls_segment_filename ' + outputPath)
 441                 .outputOption('-hls_segment_type fmp4')
 442                 .outputOption('-f hls')
 443                 .outputOption('-hls_flags single_file')
 444 }
 445
 446 async function buildHLSVODCommand (command: ffmpeg.FfmpegCommand, options: HLSTranscodeOptions) {
 447   const videoPath = getHLSVideoPath(options)
 448
 449   if (options.copyCodecs) command = presetCopy(command)
 450   else if (options.resolution === VideoResolution.H_NOVIDEO) command = presetOnlyAudio(command)
 451   else command = await buildx264VODCommand(command, options)
 452
 453   addCommonHLSVODCommandOptions(command, videoPath)
 454
 455   return command
 456 }
 457
 458 async function buildHLSVODFromTSCommand (command: ffmpeg.FfmpegCommand, options: HLSFromTSTranscodeOptions) {
 459   const videoPath = getHLSVideoPath(options)
 460
 461   command.outputOption('-c copy')
 462
 463   if (options.isAAC) {
 464     // Required for example when copying an AAC stream from an MPEG-TS
 465     // Since it's a bitstream filter, we don't need to reencode the audio
 466     command.outputOption('-bsf:a aac_adtstoasc')
 467   }
 468
 469   addCommonHLSVODCommandOptions(command, videoPath)
 470
 471   return command
 472 }
 473
 474 async function fixHLSPlaylistIfNeeded (options: TranscodeOptions) {
 475   if (options.type !== 'hls' && options.type !== 'hls-from-ts') return
 476
 477   const fileContent = await readFile(options.outputPath)
 478
 479   const videoFileName = options.hlsPlaylist.videoFilename
 480   const videoFilePath = getHLSVideoPath(options)
 481
 482   // Fix wrong mapping with some ffmpeg versions
 483   const newContent = fileContent.toString()
 484                                 .replace(`#EXT-X-MAP:URI="${videoFilePath}",`, `#EXT-X-MAP:URI="${videoFileName}",`)
 485
 486   await writeFile(options.outputPath, newContent)
 487 }
 488
 489 function getHLSVideoPath (options: HLSTranscodeOptions | HLSFromTSTranscodeOptions) {
 490   return `${dirname(options.outputPath)}/${options.hlsPlaylist.videoFilename}`
 491 }
 492
 493 // ---------------------------------------------------------------------------
 494 // Transcoding presets
 495 // ---------------------------------------------------------------------------
 496
 497 // Run encoder builder depending on available encoders
 498 // Try encoders by priority: if the encoder is available, run the chosen profile or fallback to the default one
 499 // If the default one does not exist, check the next encoder
 500 async function getEncoderBuilderResult (options: {
 501   streamType: 'video' | 'audio'
 502   input: string
 503
 504   availableEncoders: AvailableEncoders
 505   profile: string
 506
 507   videoType: 'vod' | 'live'
 508
 509   resolution: number
 510   fps?: number
 511   streamNum?: number
 512 }) {
 513   const { availableEncoders, input, profile, resolution, streamType, fps, streamNum, videoType } = options
 514
 515   const encodersToTry = availableEncoders.encodersToTry[videoType][streamType]
 516   const encoders = availableEncoders.available[videoType]
 517
 518   for (const encoder of encodersToTry) {
 519     if (!(await checkFFmpegEncoders(availableEncoders)).get(encoder)) {
 520       logger.debug('Encoder %s not available in ffmpeg, skipping.', encoder)
 521       continue
 522     }
 523
 524     if (!encoders[encoder]) {
 525       logger.debug('Encoder %s not available in peertube encoders, skipping.', encoder)
 526       continue
 527     }
 528
 529     // An object containing available profiles for this encoder
 530     const builderProfiles: EncoderProfile<EncoderOptionsBuilder> = encoders[encoder]
 531     let builder = builderProfiles[profile]
 532
 533     if (!builder) {
 534       logger.debug('Profile %s for encoder %s not available. Fallback to default.', profile, encoder)
 535       builder = builderProfiles.default
 536
 537       if (!builder) {
 538         logger.debug('Default profile for encoder %s not available. Try next available encoder.', encoder)
 539         continue
 540       }
 541     }
 542
 543     const result = await builder({ input, resolution, fps, streamNum })
 544
 545     return {
 546       result,
 547
 548       // If we don't have output options, then copy the input stream
 549       encoder: result.copy === true
 550         ? 'copy'
 551         : encoder
 552     }
 553   }
 554
 555   return null
 556 }
 557
 558 async function presetVideo (options: {
 559   command: ffmpeg.FfmpegCommand
 560   input: string
 561   transcodeOptions: TranscodeOptions
 562   fps?: number
 563   scaleFilterValue?: string
 564 }) {
 565   const { command, input, transcodeOptions, fps, scaleFilterValue } = options
 566
 567   let localCommand = command
 568     .format('mp4')
 569     .outputOption('-movflags faststart')
 570
 571   addDefaultEncoderGlobalParams({ command })
 572
 573   // Audio encoder
 574   const parsedAudio = await getAudioStream(input)
 575
 576   let streamsToProcess: StreamType[] = [ 'audio', 'video' ]
 577
 578   if (!parsedAudio.audioStream) {
 579     localCommand = localCommand.noAudio()
 580     streamsToProcess = [ 'video' ]
 581   }
 582
 583   for (const streamType of streamsToProcess) {
 584     const { profile, resolution, availableEncoders } = transcodeOptions
 585
 586     const builderResult = await getEncoderBuilderResult({
 587       streamType,
 588       input,
 589       resolution,
 590       availableEncoders,
 591       profile,
 592       fps,
 593       videoType: 'vod' as 'vod'
 594     })
 595
 596     if (!builderResult) {
 597       throw new Error('No available encoder found for stream ' + streamType)
 598     }
 599
 600     logger.debug(
 601       'Apply ffmpeg params from %s for %s stream of input %s using %s profile.',
 602       builderResult.encoder, streamType, input, profile, builderResult
 603     )
 604
 605     if (streamType === 'video') {
 606       localCommand.videoCodec(builderResult.encoder)
 607
 608       if (scaleFilterValue) {
 609         localCommand.outputOption(`-vf ${getScaleFilter(builderResult.result)}=${scaleFilterValue}`)
 610       }
 611     } else if (streamType === 'audio') {
 612       localCommand.audioCodec(builderResult.encoder)
 613     }
 614
 615     applyEncoderOptions(localCommand, builderResult.result)
 616     addDefaultEncoderParams({ command: localCommand, encoder: builderResult.encoder, fps })
 617   }
 618
 619   return localCommand
 620 }
 621
 622 function presetCopy (command: ffmpeg.FfmpegCommand): ffmpeg.FfmpegCommand {
 623   return command
 624     .format('mp4')
 625     .videoCodec('copy')
 626     .audioCodec('copy')
 627 }
 628
 629 function presetOnlyAudio (command: ffmpeg.FfmpegCommand): ffmpeg.FfmpegCommand {
 630   return command
 631     .format('mp4')
 632     .audioCodec('copy')
 633     .noVideo()
 634 }
 635
 636 function applyEncoderOptions (command: ffmpeg.FfmpegCommand, options: EncoderOptions): ffmpeg.FfmpegCommand {
 637   return command
 638     .inputOptions(options.inputOptions ?? [])
 639     .outputOptions(options.outputOptions ?? [])
 640 }
 641
 642 function getScaleFilter (options: EncoderOptions): string {
 643   if (options.scaleFilter) return options.scaleFilter.name
 644
 645   return 'scale'
 646 }
 647
 648 // ---------------------------------------------------------------------------
 649 // Utils
 650 // ---------------------------------------------------------------------------
 651
 652 function getFFmpeg (input: string, type: 'live' | 'vod') {
 653   // We set cwd explicitly because ffmpeg appears to create temporary files when trancoding which fails in read-only file systems
 654   const command = ffmpeg(input, {
 655     niceness: type === 'live' ? FFMPEG_NICE.LIVE : FFMPEG_NICE.VOD,
 656     cwd: CONFIG.STORAGE.TMP_DIR
 657   })
 658
 659   const threads = type === 'live'
 660     ? CONFIG.LIVE.TRANSCODING.THREADS
 661     : CONFIG.TRANSCODING.THREADS
 662
 663   if (threads > 0) {
 664     // If we don't set any threads ffmpeg will chose automatically
 665     command.outputOption('-threads ' + threads)
 666   }
 667
 668   return command
 669 }
 670
 671 function getFFmpegVersion () {
 672   return new Promise<string>((res, rej) => {
 673     (ffmpeg() as any)._getFfmpegPath((err, ffmpegPath) => {
 674       if (err) return rej(err)
 675       if (!ffmpegPath) return rej(new Error('Could not find ffmpeg path'))
 676
 677       return execPromise(`${ffmpegPath} -version`)
 678         .then(stdout => {
 679           const parsed = stdout.match(/ffmpeg version .?(\d+\.\d+(\.\d+)?)/)
 680           if (!parsed || !parsed[1]) return rej(new Error(`Could not find ffmpeg version in ${stdout}`))
 681
 682           // Fix ffmpeg version that does not include patch version (4.4 for example)
 683           let version = parsed[1]
 684           if (version.match(/^\d+\.\d+$/)) {
 685             version += '.0'
 686           }
 687
 688           return res(version)
 689         })
 690         .catch(err => rej(err))
 691     })
 692   })
 693 }
 694
 695 async function runCommand (options: {
 696   command: ffmpeg.FfmpegCommand
 697   silent?: boolean // false
 698   job?: Job
 699 }) {
 700   const { command, silent = false, job } = options
 701
 702   return new Promise<void>((res, rej) => {
 703     command.on('error', (err, stdout, stderr) => {
 704       if (silent !== true) logger.error('Error in ffmpeg.', { stdout, stderr })
 705
 706       rej(err)
 707     })
 708
 709     command.on('end', (stdout, stderr) => {
 710       logger.debug('FFmpeg command ended.', { stdout, stderr })
 711
 712       res()
 713     })
 714
 715     if (job) {
 716       command.on('progress', progress => {
 717         if (!progress.percent) return
 718
 719         job.progress(Math.round(progress.percent))
 720           .catch(err => logger.warn('Cannot set ffmpeg job progress.', { err }))
 721       })
 722     }
 723
 724     command.run()
 725   })
 726 }
 727
 728 // Avoid "height not divisible by 2" error
 729 function getScaleCleanerValue () {
 730   return 'trunc(iw/2)*2:trunc(ih/2)*2'
 731 }
 732
 733 // ---------------------------------------------------------------------------
 734
 735 export {
 736   getLiveTranscodingCommand,
 737   getLiveMuxingCommand,
 738   buildStreamSuffix,
 739   convertWebPToJPG,
 740   processGIF,
 741   generateImageFromVideoFile,
 742   TranscodeOptions,
 743   TranscodeOptionsType,
 744   transcode,
 745   runCommand,
 746   getFFmpegVersion,
 747
 748   resetSupportedEncoders,
 749
 750   // builders
 751   buildx264VODCommand
 752 }