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-rw-r--r--server/helpers/ffmpeg-utils.ts346
1 files changed, 196 insertions, 150 deletions
diff --git a/server/helpers/ffmpeg-utils.ts b/server/helpers/ffmpeg-utils.ts
index df3926658..e297108df 100644
--- a/server/helpers/ffmpeg-utils.ts
+++ b/server/helpers/ffmpeg-utils.ts
@@ -4,11 +4,88 @@ import { dirname, join } from 'path'
4import { getTargetBitrate, VideoResolution } from '../../shared/models/videos' 4import { getTargetBitrate, VideoResolution } from '../../shared/models/videos'
5import { checkFFmpegEncoders } from '../initializers/checker-before-init' 5import { checkFFmpegEncoders } from '../initializers/checker-before-init'
6import { CONFIG } from '../initializers/config' 6import { CONFIG } from '../initializers/config'
7import { FFMPEG_NICE, VIDEO_LIVE, VIDEO_TRANSCODING_FPS } from '../initializers/constants' 7import { FFMPEG_NICE, VIDEO_LIVE, VIDEO_TRANSCODING_ENCODERS, VIDEO_TRANSCODING_FPS } from '../initializers/constants'
8import { getAudioStream, getClosestFramerateStandard, getMaxAudioBitrate, getVideoFileFPS } from './ffprobe-utils' 8import { getAudioStream, getClosestFramerateStandard, getVideoFileFPS } from './ffprobe-utils'
9import { processImage } from './image-utils' 9import { processImage } from './image-utils'
10import { logger } from './logger' 10import { logger } from './logger'
11 11
12// ---------------------------------------------------------------------------
13// Encoder options
14// ---------------------------------------------------------------------------
15
16// Options builders
17
18export type EncoderOptionsBuilder = (params: {
19 input: string
20 resolution: VideoResolution
21 fps?: number
22}) => Promise<EncoderOptions> | EncoderOptions
23
24// Options types
25
26export interface EncoderOptions {
27 outputOptions: string[]
28}
29
30// All our encoders
31
32export interface EncoderProfile <T> {
33 [ profile: string ]: T
34
35 default: T
36}
37
38export type AvailableEncoders = {
39 [ id in 'live' | 'vod' ]: {
40 [ encoder in 'libx264' | 'aac' | 'libfdkAAC' ]: EncoderProfile<EncoderOptionsBuilder>
41 }
42}
43
44// ---------------------------------------------------------------------------
45// Image manipulation
46// ---------------------------------------------------------------------------
47
48function convertWebPToJPG (path: string, destination: string): Promise<void> {
49 const command = ffmpeg(path)
50 .output(destination)
51
52 return runCommand(command)
53}
54
55function processGIF (
56 path: string,
57 destination: string,
58 newSize: { width: number, height: number },
59 keepOriginal = false
60): Promise<void> {
61 return new Promise<void>(async (res, rej) => {
62 if (path === destination) {
63 throw new Error('FFmpeg needs an input path different that the output path.')
64 }
65
66 logger.debug('Processing gif %s to %s.', path, destination)
67
68 try {
69 const command = ffmpeg(path)
70 .fps(20)
71 .size(`${newSize.width}x${newSize.height}`)
72 .output(destination)
73
74 command.on('error', (err, stdout, stderr) => {
75 logger.error('Error in ffmpeg gif resizing process.', { stdout, stderr })
76 return rej(err)
77 })
78 .on('end', async () => {
79 if (keepOriginal !== true) await remove(path)
80 res()
81 })
82 .run()
83 } catch (err) {
84 return rej(err)
85 }
86 })
87}
88
12async function generateImageFromVideoFile (fromPath: string, folder: string, imageName: string, size: { width: number, height: number }) { 89async function generateImageFromVideoFile (fromPath: string, folder: string, imageName: string, size: { width: number, height: number }) {
13 const pendingImageName = 'pending-' + imageName 90 const pendingImageName = 'pending-' + imageName
14 91
@@ -49,9 +126,15 @@ type TranscodeOptionsType = 'hls' | 'quick-transcode' | 'video' | 'merge-audio'
49 126
50interface BaseTranscodeOptions { 127interface BaseTranscodeOptions {
51 type: TranscodeOptionsType 128 type: TranscodeOptionsType
129
52 inputPath: string 130 inputPath: string
53 outputPath: string 131 outputPath: string
132
133 availableEncoders: AvailableEncoders
134 profile: string
135
54 resolution: VideoResolution 136 resolution: VideoResolution
137
55 isPortraitMode?: boolean 138 isPortraitMode?: boolean
56} 139}
57 140
@@ -94,7 +177,7 @@ const builders: {
94 'hls': buildHLSVODCommand, 177 'hls': buildHLSVODCommand,
95 'merge-audio': buildAudioMergeCommand, 178 'merge-audio': buildAudioMergeCommand,
96 'only-audio': buildOnlyAudioCommand, 179 'only-audio': buildOnlyAudioCommand,
97 'video': buildx264Command 180 'video': buildx264VODCommand
98} 181}
99 182
100async function transcode (options: TranscodeOptions) { 183async function transcode (options: TranscodeOptions) {
@@ -110,58 +193,11 @@ async function transcode (options: TranscodeOptions) {
110 await fixHLSPlaylistIfNeeded(options) 193 await fixHLSPlaylistIfNeeded(options)
111} 194}
112 195
113function convertWebPToJPG (path: string, destination: string): Promise<void> { 196// ---------------------------------------------------------------------------
114 return new Promise<void>(async (res, rej) => { 197// Live muxing/transcoding functions
115 try { 198// ---------------------------------------------------------------------------
116 const command = ffmpeg(path).output(destination)
117
118 command.on('error', (err, stdout, stderr) => {
119 logger.error('Error in ffmpeg webp convert process.', { stdout, stderr })
120 return rej(err)
121 })
122 .on('end', () => res())
123 .run()
124 } catch (err) {
125 return rej(err)
126 }
127 })
128}
129
130function processGIF (
131 path: string,
132 destination: string,
133 newSize: { width: number, height: number },
134 keepOriginal = false
135): Promise<void> {
136 return new Promise<void>(async (res, rej) => {
137 if (path === destination) {
138 throw new Error('FFmpeg needs an input path different that the output path.')
139 }
140
141 logger.debug('Processing gif %s to %s.', path, destination)
142
143 try {
144 const command = ffmpeg(path)
145 .fps(20)
146 .size(`${newSize.width}x${newSize.height}`)
147 .output(destination)
148
149 command.on('error', (err, stdout, stderr) => {
150 logger.error('Error in ffmpeg gif resizing process.', { stdout, stderr })
151 return rej(err)
152 })
153 .on('end', async () => {
154 if (keepOriginal !== true) await remove(path)
155 res()
156 })
157 .run()
158 } catch (err) {
159 return rej(err)
160 }
161 })
162}
163 199
164function runLiveTranscoding (rtmpUrl: string, outPath: string, resolutions: number[], fps, deleteSegments: boolean) { 200function getLiveTranscodingCommand (rtmpUrl: string, outPath: string, resolutions: number[], fps: number, deleteSegments: boolean) {
165 const command = getFFmpeg(rtmpUrl) 201 const command = getFFmpeg(rtmpUrl)
166 command.inputOption('-fflags nobuffer') 202 command.inputOption('-fflags nobuffer')
167 203
@@ -183,14 +219,9 @@ function runLiveTranscoding (rtmpUrl: string, outPath: string, resolutions: numb
183 })) 219 }))
184 ]) 220 ])
185 221
186 command.outputOption('-b_strategy 1') 222 addEncoderDefaultParams(command, 'libx264', fps)
187 command.outputOption('-bf 16') 223
188 command.outputOption('-preset superfast') 224 command.outputOption('-preset superfast')
189 command.outputOption('-level 3.1')
190 command.outputOption('-map_metadata -1')
191 command.outputOption('-pix_fmt yuv420p')
192 command.outputOption('-max_muxing_queue_size 1024')
193 command.outputOption('-g ' + (fps * 2))
194 225
195 for (let i = 0; i < resolutions.length; i++) { 226 for (let i = 0; i < resolutions.length; i++) {
196 const resolution = resolutions[i] 227 const resolution = resolutions[i]
@@ -209,12 +240,10 @@ function runLiveTranscoding (rtmpUrl: string, outPath: string, resolutions: numb
209 240
210 command.outputOption('-var_stream_map', varStreamMap.join(' ')) 241 command.outputOption('-var_stream_map', varStreamMap.join(' '))
211 242
212 command.run()
213
214 return command 243 return command
215} 244}
216 245
217function runLiveMuxing (rtmpUrl: string, outPath: string, deleteSegments: boolean) { 246function getLiveMuxingCommand (rtmpUrl: string, outPath: string, deleteSegments: boolean) {
218 const command = getFFmpeg(rtmpUrl) 247 const command = getFFmpeg(rtmpUrl)
219 command.inputOption('-fflags nobuffer') 248 command.inputOption('-fflags nobuffer')
220 249
@@ -225,8 +254,6 @@ function runLiveMuxing (rtmpUrl: string, outPath: string, deleteSegments: boolea
225 254
226 addDefaultLiveHLSParams(command, outPath, deleteSegments) 255 addDefaultLiveHLSParams(command, outPath, deleteSegments)
227 256
228 command.run()
229
230 return command 257 return command
231} 258}
232 259
@@ -255,32 +282,13 @@ async function hlsPlaylistToFragmentedMP4 (hlsDirectory: string, segmentFiles: s
255 return runCommand(command, cleaner) 282 return runCommand(command, cleaner)
256} 283}
257 284
258async function runCommand (command: ffmpeg.FfmpegCommand, onEnd?: Function) {
259 return new Promise<string>((res, rej) => {
260 command.on('error', (err, stdout, stderr) => {
261 if (onEnd) onEnd()
262
263 logger.error('Error in transcoding job.', { stdout, stderr })
264 rej(err)
265 })
266
267 command.on('end', () => {
268 if (onEnd) onEnd()
269
270 res()
271 })
272
273 command.run()
274 })
275}
276
277// --------------------------------------------------------------------------- 285// ---------------------------------------------------------------------------
278 286
279export { 287export {
280 runLiveMuxing, 288 getLiveTranscodingCommand,
289 getLiveMuxingCommand,
281 convertWebPToJPG, 290 convertWebPToJPG,
282 processGIF, 291 processGIF,
283 runLiveTranscoding,
284 generateImageFromVideoFile, 292 generateImageFromVideoFile,
285 TranscodeOptions, 293 TranscodeOptions,
286 TranscodeOptionsType, 294 TranscodeOptionsType,
@@ -290,12 +298,23 @@ export {
290 298
291// --------------------------------------------------------------------------- 299// ---------------------------------------------------------------------------
292 300
293function addDefaultX264Params (command: ffmpeg.FfmpegCommand) { 301// ---------------------------------------------------------------------------
302// Default options
303// ---------------------------------------------------------------------------
304
305function addEncoderDefaultParams (command: ffmpeg.FfmpegCommand, encoder: 'libx264' | string, fps?: number) {
306 if (encoder !== 'libx264') return
307
294 command.outputOption('-level 3.1') // 3.1 is the minimal resource allocation for our highest supported resolution 308 command.outputOption('-level 3.1') // 3.1 is the minimal resource allocation for our highest supported resolution
295 .outputOption('-b_strategy 1') // NOTE: b-strategy 1 - heuristic algorithm, 16 is optimal B-frames for it 309 .outputOption('-b_strategy 1') // NOTE: b-strategy 1 - heuristic algorithm, 16 is optimal B-frames for it
296 .outputOption('-bf 16') // NOTE: Why 16: https://github.com/Chocobozzz/PeerTube/pull/774. b-strategy 2 -> B-frames<16 310 .outputOption('-bf 16') // NOTE: Why 16: https://github.com/Chocobozzz/PeerTube/pull/774. b-strategy 2 -> B-frames<16
297 .outputOption('-pix_fmt yuv420p') // allows import of source material with incompatible pixel formats (e.g. MJPEG video) 311 .outputOption('-pix_fmt yuv420p') // allows import of source material with incompatible pixel formats (e.g. MJPEG video)
298 .outputOption('-map_metadata -1') // strip all metadata 312 .outputOption('-map_metadata -1') // strip all metadata
313 .outputOption('-max_muxing_queue_size 1024') // avoid issues when transcoding some files: https://trac.ffmpeg.org/ticket/6375
314 // Keyframe interval of 2 seconds for faster seeking and resolution switching.
315 // https://streaminglearningcenter.com/blogs/whats-the-right-keyframe-interval.html
316 // https://superuser.com/a/908325
317 .outputOption('-g ' + (fps * 2))
299} 318}
300 319
301function addDefaultLiveHLSParams (command: ffmpeg.FfmpegCommand, outPath: string, deleteSegments: boolean) { 320function addDefaultLiveHLSParams (command: ffmpeg.FfmpegCommand, outPath: string, deleteSegments: boolean) {
@@ -313,7 +332,11 @@ function addDefaultLiveHLSParams (command: ffmpeg.FfmpegCommand, outPath: string
313 command.output(join(outPath, '%v.m3u8')) 332 command.output(join(outPath, '%v.m3u8'))
314} 333}
315 334
316async function buildx264Command (command: ffmpeg.FfmpegCommand, options: TranscodeOptions) { 335// ---------------------------------------------------------------------------
336// Transcode VOD command builders
337// ---------------------------------------------------------------------------
338
339async function buildx264VODCommand (command: ffmpeg.FfmpegCommand, options: TranscodeOptions) {
317 let fps = await getVideoFileFPS(options.inputPath) 340 let fps = await getVideoFileFPS(options.inputPath)
318 if ( 341 if (
319 // On small/medium resolutions, limit FPS 342 // On small/medium resolutions, limit FPS
@@ -325,7 +348,7 @@ async function buildx264Command (command: ffmpeg.FfmpegCommand, options: Transco
325 fps = getClosestFramerateStandard(fps, 'STANDARD') 348 fps = getClosestFramerateStandard(fps, 'STANDARD')
326 } 349 }
327 350
328 command = await presetH264(command, options.inputPath, options.resolution, fps) 351 command = await presetVideo(command, options.inputPath, options, fps)
329 352
330 if (options.resolution !== undefined) { 353 if (options.resolution !== undefined) {
331 // '?x720' or '720x?' for example 354 // '?x720' or '720x?' for example
@@ -347,7 +370,16 @@ async function buildx264Command (command: ffmpeg.FfmpegCommand, options: Transco
347async function buildAudioMergeCommand (command: ffmpeg.FfmpegCommand, options: MergeAudioTranscodeOptions) { 370async function buildAudioMergeCommand (command: ffmpeg.FfmpegCommand, options: MergeAudioTranscodeOptions) {
348 command = command.loop(undefined) 371 command = command.loop(undefined)
349 372
350 command = await presetH264VeryFast(command, options.audioPath, options.resolution) 373 command = await presetVideo(command, options.audioPath, options)
374
375 /*
376 MAIN reference: https://slhck.info/video/2017/03/01/rate-control.html
377 Our target situation is closer to a livestream than a stream,
378 since we want to reduce as much a possible the encoding burden,
379 although not to the point of a livestream where there is a hard
380 constraint on the frames per second to be encoded.
381 */
382 command.outputOption('-preset:v veryfast')
351 383
352 command = command.input(options.audioPath) 384 command = command.input(options.audioPath)
353 .videoFilter('scale=trunc(iw/2)*2:trunc(ih/2)*2') // Avoid "height not divisible by 2" error 385 .videoFilter('scale=trunc(iw/2)*2:trunc(ih/2)*2') // Avoid "height not divisible by 2" error
@@ -377,7 +409,7 @@ async function buildHLSVODCommand (command: ffmpeg.FfmpegCommand, options: HLSTr
377 409
378 if (options.copyCodecs) command = presetCopy(command) 410 if (options.copyCodecs) command = presetCopy(command)
379 else if (options.resolution === VideoResolution.H_NOVIDEO) command = presetOnlyAudio(command) 411 else if (options.resolution === VideoResolution.H_NOVIDEO) command = presetOnlyAudio(command)
380 else command = await buildx264Command(command, options) 412 else command = await buildx264VODCommand(command, options)
381 413
382 command = command.outputOption('-hls_time 4') 414 command = command.outputOption('-hls_time 4')
383 .outputOption('-hls_list_size 0') 415 .outputOption('-hls_list_size 0')
@@ -390,10 +422,6 @@ async function buildHLSVODCommand (command: ffmpeg.FfmpegCommand, options: HLSTr
390 return command 422 return command
391} 423}
392 424
393function getHLSVideoPath (options: HLSTranscodeOptions) {
394 return `${dirname(options.outputPath)}/${options.hlsPlaylist.videoFilename}`
395}
396
397async function fixHLSPlaylistIfNeeded (options: TranscodeOptions) { 425async function fixHLSPlaylistIfNeeded (options: TranscodeOptions) {
398 if (options.type !== 'hls') return 426 if (options.type !== 'hls') return
399 427
@@ -409,76 +437,71 @@ async function fixHLSPlaylistIfNeeded (options: TranscodeOptions) {
409 await writeFile(options.outputPath, newContent) 437 await writeFile(options.outputPath, newContent)
410} 438}
411 439
412/** 440function getHLSVideoPath (options: HLSTranscodeOptions) {
413 * A slightly customised version of the 'veryfast' x264 preset 441 return `${dirname(options.outputPath)}/${options.hlsPlaylist.videoFilename}`
414 *
415 * The veryfast preset is right in the sweet spot of performance
416 * and quality. Superfast and ultrafast will give you better
417 * performance, but then quality is noticeably worse.
418 */
419async function presetH264VeryFast (command: ffmpeg.FfmpegCommand, input: string, resolution: VideoResolution, fps?: number) {
420 let localCommand = await presetH264(command, input, resolution, fps)
421
422 localCommand = localCommand.outputOption('-preset:v veryfast')
423
424 /*
425 MAIN reference: https://slhck.info/video/2017/03/01/rate-control.html
426 Our target situation is closer to a livestream than a stream,
427 since we want to reduce as much a possible the encoding burden,
428 although not to the point of a livestream where there is a hard
429 constraint on the frames per second to be encoded.
430 */
431
432 return localCommand
433} 442}
434 443
435/** 444// ---------------------------------------------------------------------------
436 * Standard profile, with variable bitrate audio and faststart. 445// Transcoding presets
437 * 446// ---------------------------------------------------------------------------
438 * As for the audio, quality '5' is the highest and ensures 96-112kbps/channel 447
439 * See https://trac.ffmpeg.org/wiki/Encode/AAC#fdk_vbr 448async function presetVideo (
440 */ 449 command: ffmpeg.FfmpegCommand,
441async function presetH264 (command: ffmpeg.FfmpegCommand, input: string, resolution: VideoResolution, fps?: number) { 450 input: string,
451 transcodeOptions: TranscodeOptions,
452 fps?: number
453) {
442 let localCommand = command 454 let localCommand = command
443 .format('mp4') 455 .format('mp4')
444 .videoCodec('libx264')
445 .outputOption('-movflags faststart') 456 .outputOption('-movflags faststart')
446 457
447 addDefaultX264Params(localCommand) 458 // Audio encoder
448
449 const parsedAudio = await getAudioStream(input) 459 const parsedAudio = await getAudioStream(input)
450 460
461 let streamsToProcess = [ 'AUDIO', 'VIDEO' ]
462 const streamsFound = {
463 AUDIO: '',
464 VIDEO: ''
465 }
466
451 if (!parsedAudio.audioStream) { 467 if (!parsedAudio.audioStream) {
452 localCommand = localCommand.noAudio() 468 localCommand = localCommand.noAudio()
453 } else if ((await checkFFmpegEncoders()).get('libfdk_aac')) { // we favor VBR, if a good AAC encoder is available 469 streamsToProcess = [ 'VIDEO' ]
454 localCommand = localCommand 470 }
455 .audioCodec('libfdk_aac')
456 .audioQuality(5)
457 } else {
458 // we try to reduce the ceiling bitrate by making rough matches of bitrates
459 // of course this is far from perfect, but it might save some space in the end
460 localCommand = localCommand.audioCodec('aac')
461 471
462 const audioCodecName = parsedAudio.audioStream['codec_name'] 472 for (const stream of streamsToProcess) {
473 const encodersToTry: string[] = VIDEO_TRANSCODING_ENCODERS[stream]
463 474
464 const bitrate = getMaxAudioBitrate(audioCodecName, parsedAudio.bitrate) 475 for (const encoder of encodersToTry) {
476 if (!(await checkFFmpegEncoders()).get(encoder)) continue
465 477
466 if (bitrate !== undefined && bitrate !== -1) localCommand = localCommand.audioBitrate(bitrate) 478 const builderProfiles: EncoderProfile<EncoderOptionsBuilder> = transcodeOptions.availableEncoders.vod[encoder]
467 } 479 let builder = builderProfiles[transcodeOptions.profile]
468 480
469 if (fps) { 481 if (!builder) {
470 // Constrained Encoding (VBV) 482 logger.debug('Profile %s for encoder %s not available. Fallback to default.', transcodeOptions.profile, encoder)
471 // https://slhck.info/video/2017/03/01/rate-control.html 483 builder = builderProfiles.default
472 // https://trac.ffmpeg.org/wiki/Limiting%20the%20output%20bitrate 484 }
473 const targetBitrate = getTargetBitrate(resolution, fps, VIDEO_TRANSCODING_FPS) 485
474 localCommand = localCommand.outputOptions([ `-maxrate ${targetBitrate}`, `-bufsize ${targetBitrate * 2}` ]) 486 const builderResult = await builder({ input, resolution: transcodeOptions.resolution, fps })
475 487
476 // Keyframe interval of 2 seconds for faster seeking and resolution switching. 488 logger.debug('Apply ffmpeg params from %s.', encoder, builderResult)
477 // https://streaminglearningcenter.com/blogs/whats-the-right-keyframe-interval.html 489
478 // https://superuser.com/a/908325 490 localCommand.outputOptions(builderResult.outputOptions)
479 localCommand = localCommand.outputOption(`-g ${fps * 2}`) 491
492 addEncoderDefaultParams(localCommand, encoder)
493
494 streamsFound[stream] = encoder
495 break
496 }
497
498 if (!streamsFound[stream]) {
499 throw new Error('No available encoder found ' + encodersToTry.join(', '))
500 }
480 } 501 }
481 502
503 localCommand.videoCodec(streamsFound.VIDEO)
504
482 return localCommand 505 return localCommand
483} 506}
484 507
@@ -496,6 +519,10 @@ function presetOnlyAudio (command: ffmpeg.FfmpegCommand): ffmpeg.FfmpegCommand {
496 .noVideo() 519 .noVideo()
497} 520}
498 521
522// ---------------------------------------------------------------------------
523// Utils
524// ---------------------------------------------------------------------------
525
499function getFFmpeg (input: string) { 526function getFFmpeg (input: string) {
500 // We set cwd explicitly because ffmpeg appears to create temporary files when trancoding which fails in read-only file systems 527 // We set cwd explicitly because ffmpeg appears to create temporary files when trancoding which fails in read-only file systems
501 const command = ffmpeg(input, { niceness: FFMPEG_NICE.TRANSCODING, cwd: CONFIG.STORAGE.TMP_DIR }) 528 const command = ffmpeg(input, { niceness: FFMPEG_NICE.TRANSCODING, cwd: CONFIG.STORAGE.TMP_DIR })
@@ -507,3 +534,22 @@ function getFFmpeg (input: string) {
507 534
508 return command 535 return command
509} 536}
537
538async function runCommand (command: ffmpeg.FfmpegCommand, onEnd?: Function) {
539 return new Promise<void>((res, rej) => {
540 command.on('error', (err, stdout, stderr) => {
541 if (onEnd) onEnd()
542
543 logger.error('Error in transcoding job.', { stdout, stderr })
544 rej(err)
545 })
546
547 command.on('end', () => {
548 if (onEnd) onEnd()
549
550 res()
551 })
552
553 command.run()
554 })
555}