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, EncoderOptionsBuilder, EncoderProfile, VideoResolution } from '../../shared/models/videos'
   7 import { CONFIG } from '../initializers/config'
   8 import { 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: VideoResolution
 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   command.complexFilter([
 230     {
 231       inputs: '[v:0]',
 232       filter: 'split',
 233       options: resolutions.length,
 234       outputs: resolutions.map(r => `vtemp${r}`)
 235     },
 236
 237     ...resolutions.map(r => ({
 238       inputs: `vtemp${r}`,
 239       filter: 'scale',
 240       options: `w=-2:h=${r}`,
 241       outputs: `vout${r}`
 242     }))
 243   ])
 244
 245   command.outputOption('-preset superfast')
 246   command.outputOption('-sc_threshold 0')
 247
 248   addDefaultEncoderGlobalParams({ command })
 249
 250   for (let i = 0; i < resolutions.length; i++) {
 251     const resolution = resolutions[i]
 252     const resolutionFPS = computeFPS(fps, resolution)
 253
 254     const baseEncoderBuilderParams = {
 255       input,
 256
 257       availableEncoders,
 258       profile,
 259
 260       fps: resolutionFPS,
 261       resolution,
 262       streamNum: i,
 263       videoType: 'live' as 'live'
 264     }
 265
 266     {
 267       const streamType: StreamType = 'video'
 268       const builderResult = await getEncoderBuilderResult(Object.assign({}, baseEncoderBuilderParams, { streamType }))
 269       if (!builderResult) {
 270         throw new Error('No available live video encoder found')
 271       }
 272
 273       command.outputOption(`-map [vout${resolution}]`)
 274
 275       addDefaultEncoderParams({ command, encoder: builderResult.encoder, fps: resolutionFPS, streamNum: i })
 276
 277       logger.debug('Apply ffmpeg live video params from %s using %s profile.', builderResult.encoder, profile, builderResult)
 278
 279       command.outputOption(`${buildStreamSuffix('-c:v', i)} ${builderResult.encoder}`)
 280       command.addOutputOptions(builderResult.result.outputOptions)
 281     }
 282
 283     {
 284       const streamType: StreamType = 'audio'
 285       const builderResult = await getEncoderBuilderResult(Object.assign({}, baseEncoderBuilderParams, { streamType }))
 286       if (!builderResult) {
 287         throw new Error('No available live audio encoder found')
 288       }
 289
 290       command.outputOption('-map a:0')
 291
 292       addDefaultEncoderParams({ command, encoder: builderResult.encoder, fps: resolutionFPS, streamNum: i })
 293
 294       logger.debug('Apply ffmpeg live audio params from %s using %s profile.', builderResult.encoder, profile, builderResult)
 295
 296       command.outputOption(`${buildStreamSuffix('-c:a', i)} ${builderResult.encoder}`)
 297       command.addOutputOptions(builderResult.result.outputOptions)
 298     }
 299
 300     varStreamMap.push(`v:${i},a:${i}`)
 301   }
 302
 303   addDefaultLiveHLSParams(command, outPath)
 304
 305   command.outputOption('-var_stream_map', varStreamMap.join(' '))
 306
 307   return command
 308 }
 309
 310 function getLiveMuxingCommand (rtmpUrl: string, outPath: string) {
 311   const command = getFFmpeg(rtmpUrl, 'live')
 312
 313   command.outputOption('-c:v copy')
 314   command.outputOption('-c:a copy')
 315   command.outputOption('-map 0:a?')
 316   command.outputOption('-map 0:v?')
 317
 318   addDefaultLiveHLSParams(command, outPath)
 319
 320   return command
 321 }
 322
 323 function buildStreamSuffix (base: string, streamNum?: number) {
 324   if (streamNum !== undefined) {
 325     return `${base}:${streamNum}`
 326   }
 327
 328   return base
 329 }
 330
 331 // ---------------------------------------------------------------------------
 332 // Default options
 333 // ---------------------------------------------------------------------------
 334
 335 function addDefaultEncoderGlobalParams (options: {
 336   command: ffmpeg.FfmpegCommand
 337 }) {
 338   const { command } = options
 339
 340   // avoid issues when transcoding some files: https://trac.ffmpeg.org/ticket/6375
 341   command.outputOption('-max_muxing_queue_size 1024')
 342          // strip all metadata
 343          .outputOption('-map_metadata -1')
 344          // NOTE: b-strategy 1 - heuristic algorithm, 16 is optimal B-frames for it
 345          .outputOption('-b_strategy 1')
 346          // NOTE: Why 16: https://github.com/Chocobozzz/PeerTube/pull/774. b-strategy 2 -> B-frames<16
 347          .outputOption('-bf 16')
 348          // allows import of source material with incompatible pixel formats (e.g. MJPEG video)
 349          .outputOption('-pix_fmt yuv420p')
 350 }
 351
 352 function addDefaultEncoderParams (options: {
 353   command: ffmpeg.FfmpegCommand
 354   encoder: 'libx264' | string
 355   streamNum?: number
 356   fps?: number
 357 }) {
 358   const { command, encoder, fps, streamNum } = options
 359
 360   if (encoder === 'libx264') {
 361     // 3.1 is the minimal resource allocation for our highest supported resolution
 362     command.outputOption(buildStreamSuffix('-level:v', streamNum) + ' 3.1')
 363
 364     if (fps) {
 365       // Keyframe interval of 2 seconds for faster seeking and resolution switching.
 366       // https://streaminglearningcenter.com/blogs/whats-the-right-keyframe-interval.html
 367       // https://superuser.com/a/908325
 368       command.outputOption(buildStreamSuffix('-g:v', streamNum) + ' ' + (fps * 2))
 369     }
 370   }
 371 }
 372
 373 function addDefaultLiveHLSParams (command: ffmpeg.FfmpegCommand, outPath: string) {
 374   command.outputOption('-hls_time ' + VIDEO_LIVE.SEGMENT_TIME_SECONDS)
 375   command.outputOption('-hls_list_size ' + VIDEO_LIVE.SEGMENTS_LIST_SIZE)
 376   command.outputOption('-hls_flags delete_segments+independent_segments')
 377   command.outputOption(`-hls_segment_filename ${join(outPath, '%v-%06d.ts')}`)
 378   command.outputOption('-master_pl_name master.m3u8')
 379   command.outputOption(`-f hls`)
 380
 381   command.output(join(outPath, '%v.m3u8'))
 382 }
 383
 384 // ---------------------------------------------------------------------------
 385 // Transcode VOD command builders
 386 // ---------------------------------------------------------------------------
 387
 388 async function buildx264VODCommand (command: ffmpeg.FfmpegCommand, options: TranscodeOptions) {
 389   let fps = await getVideoFileFPS(options.inputPath)
 390   fps = computeFPS(fps, options.resolution)
 391
 392   command = await presetVideo(command, options.inputPath, options, fps)
 393
 394   if (options.resolution !== undefined) {
 395     // '?x720' or '720x?' for example
 396     const size = options.isPortraitMode === true
 397       ? `${options.resolution}x?`
 398       : `?x${options.resolution}`
 399
 400     command = command.size(size)
 401   }
 402
 403   return command
 404 }
 405
 406 async function buildAudioMergeCommand (command: ffmpeg.FfmpegCommand, options: MergeAudioTranscodeOptions) {
 407   command = command.loop(undefined)
 408
 409   command = await presetVideo(command, options.audioPath, options)
 410
 411   command.outputOption('-preset:v veryfast')
 412
 413   command = command.input(options.audioPath)
 414                    .videoFilter('scale=trunc(iw/2)*2:trunc(ih/2)*2') // Avoid "height not divisible by 2" error
 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: 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 (
 559   command: ffmpeg.FfmpegCommand,
 560   input: string,
 561   transcodeOptions: TranscodeOptions,
 562   fps?: number
 563 ) {
 564   let localCommand = command
 565     .format('mp4')
 566     .outputOption('-movflags faststart')
 567
 568   addDefaultEncoderGlobalParams({ command })
 569
 570   // Audio encoder
 571   const parsedAudio = await getAudioStream(input)
 572
 573   let streamsToProcess: StreamType[] = [ 'audio', 'video' ]
 574
 575   if (!parsedAudio.audioStream) {
 576     localCommand = localCommand.noAudio()
 577     streamsToProcess = [ 'video' ]
 578   }
 579
 580   for (const streamType of streamsToProcess) {
 581     const { profile, resolution, availableEncoders } = transcodeOptions
 582
 583     const builderResult = await getEncoderBuilderResult({
 584       streamType,
 585       input,
 586       resolution,
 587       availableEncoders,
 588       profile,
 589       fps,
 590       videoType: 'vod' as 'vod'
 591     })
 592
 593     if (!builderResult) {
 594       throw new Error('No available encoder found for stream ' + streamType)
 595     }
 596
 597     logger.debug(
 598       'Apply ffmpeg params from %s for %s stream of input %s using %s profile.',
 599       builderResult.encoder, streamType, input, profile, builderResult
 600     )
 601
 602     if (streamType === 'video') {
 603       localCommand.videoCodec(builderResult.encoder)
 604     } else if (streamType === 'audio') {
 605       localCommand.audioCodec(builderResult.encoder)
 606     }
 607
 608     command.addOutputOptions(builderResult.result.outputOptions)
 609     addDefaultEncoderParams({ command: localCommand, encoder: builderResult.encoder, fps })
 610   }
 611
 612   return localCommand
 613 }
 614
 615 function presetCopy (command: ffmpeg.FfmpegCommand): ffmpeg.FfmpegCommand {
 616   return command
 617     .format('mp4')
 618     .videoCodec('copy')
 619     .audioCodec('copy')
 620 }
 621
 622 function presetOnlyAudio (command: ffmpeg.FfmpegCommand): ffmpeg.FfmpegCommand {
 623   return command
 624     .format('mp4')
 625     .audioCodec('copy')
 626     .noVideo()
 627 }
 628
 629 // ---------------------------------------------------------------------------
 630 // Utils
 631 // ---------------------------------------------------------------------------
 632
 633 function getFFmpeg (input: string, type: 'live' | 'vod') {
 634   // We set cwd explicitly because ffmpeg appears to create temporary files when trancoding which fails in read-only file systems
 635   const command = ffmpeg(input, {
 636     niceness: type === 'live' ? FFMPEG_NICE.LIVE : FFMPEG_NICE.VOD,
 637     cwd: CONFIG.STORAGE.TMP_DIR
 638   })
 639
 640   const threads = type === 'live'
 641     ? CONFIG.LIVE.TRANSCODING.THREADS
 642     : CONFIG.TRANSCODING.THREADS
 643
 644   if (threads > 0) {
 645     // If we don't set any threads ffmpeg will chose automatically
 646     command.outputOption('-threads ' + threads)
 647   }
 648
 649   return command
 650 }
 651
 652 async function runCommand (options: {
 653   command: ffmpeg.FfmpegCommand
 654   silent?: boolean // false
 655   job?: Job
 656 }) {
 657   const { command, silent = false, job } = options
 658
 659   return new Promise<void>((res, rej) => {
 660     command.on('error', (err, stdout, stderr) => {
 661       if (silent !== true) logger.error('Error in ffmpeg.', { stdout, stderr })
 662
 663       rej(err)
 664     })
 665
 666     command.on('end', (stdout, stderr) => {
 667       logger.debug('FFmpeg command ended.', { stdout, stderr })
 668
 669       res()
 670     })
 671
 672     if (job) {
 673       command.on('progress', progress => {
 674         if (!progress.percent) return
 675
 676         job.progress(Math.round(progress.percent))
 677           .catch(err => logger.warn('Cannot set ffmpeg job progress.', { err }))
 678       })
 679     }
 680
 681     command.run()
 682   })
 683 }
 684
 685 // ---------------------------------------------------------------------------
 686
 687 export {
 688   getLiveTranscodingCommand,
 689   getLiveMuxingCommand,
 690   buildStreamSuffix,
 691   convertWebPToJPG,
 692   processGIF,
 693   generateImageFromVideoFile,
 694   TranscodeOptions,
 695   TranscodeOptionsType,
 696   transcode,
 697   runCommand,
 698
 699   resetSupportedEncoders,
 700
 701   // builders
 702   buildx264VODCommand
 703 }