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Commit | Line | Data |
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14d3270f | 1 | import * as ffmpeg from 'fluent-ffmpeg' |
c6c0fa6c | 2 | import { readFile, remove, writeFile } from 'fs-extra' |
09209296 | 3 | import { dirname, join } from 'path' |
c6c0fa6c | 4 | import { VideoFileMetadata } from '@shared/models/videos/video-file-metadata' |
a1587156 | 5 | import { getMaxBitrate, getTargetBitrate, VideoResolution } from '../../shared/models/videos' |
c6c0fa6c C |
6 | import { checkFFmpegEncoders } from '../initializers/checker-before-init' |
7 | import { CONFIG } from '../initializers/config' | |
fb719404 | 8 | import { FFMPEG_NICE, VIDEO_LIVE, VIDEO_TRANSCODING_FPS } from '../initializers/constants' |
26670720 | 9 | import { processImage } from './image-utils' |
6fdc553a | 10 | import { logger } from './logger' |
31c82cd9 | 11 | import { concat } from 'lodash' |
14d3270f | 12 | |
a1587156 C |
13 | /** |
14 | * A toolbox to play with audio | |
15 | */ | |
16 | namespace audio { | |
17 | export const get = (videoPath: string) => { | |
18 | // without position, ffprobe considers the last input only | |
19 | // we make it consider the first input only | |
20 | // if you pass a file path to pos, then ffprobe acts on that file directly | |
21 | return new Promise<{ absolutePath: string, audioStream?: any }>((res, rej) => { | |
22 | ||
23 | function parseFfprobe (err: any, data: ffmpeg.FfprobeData) { | |
24 | if (err) return rej(err) | |
25 | ||
26 | if ('streams' in data) { | |
27 | const audioStream = data.streams.find(stream => stream['codec_type'] === 'audio') | |
28 | if (audioStream) { | |
29 | return res({ | |
30 | absolutePath: data.format.filename, | |
31 | audioStream | |
32 | }) | |
33 | } | |
34 | } | |
35 | ||
36 | return res({ absolutePath: data.format.filename }) | |
37 | } | |
38 | ||
39 | return ffmpeg.ffprobe(videoPath, parseFfprobe) | |
40 | }) | |
41 | } | |
42 | ||
43 | export namespace bitrate { | |
44 | const baseKbitrate = 384 | |
45 | ||
46 | const toBits = (kbits: number) => kbits * 8000 | |
47 | ||
48 | export const aac = (bitrate: number): number => { | |
49 | switch (true) { | |
50 | case bitrate > toBits(baseKbitrate): | |
51 | return baseKbitrate | |
52 | ||
53 | default: | |
54 | return -1 // we interpret it as a signal to copy the audio stream as is | |
55 | } | |
56 | } | |
57 | ||
58 | export const mp3 = (bitrate: number): number => { | |
59 | /* | |
60 | a 192kbit/sec mp3 doesn't hold as much information as a 192kbit/sec aac. | |
61 | That's why, when using aac, we can go to lower kbit/sec. The equivalences | |
62 | made here are not made to be accurate, especially with good mp3 encoders. | |
63 | */ | |
64 | switch (true) { | |
65 | case bitrate <= toBits(192): | |
66 | return 128 | |
67 | ||
68 | case bitrate <= toBits(384): | |
69 | return 256 | |
70 | ||
71 | default: | |
72 | return baseKbitrate | |
73 | } | |
74 | } | |
75 | } | |
76 | } | |
77 | ||
c6c0fa6c C |
78 | function computeResolutionsToTranscode (videoFileResolution: number, type: 'vod' | 'live') { |
79 | const configResolutions = type === 'vod' | |
80 | ? CONFIG.TRANSCODING.RESOLUTIONS | |
81 | : CONFIG.LIVE.TRANSCODING.RESOLUTIONS | |
82 | ||
06215f15 | 83 | const resolutionsEnabled: number[] = [] |
06215f15 C |
84 | |
85 | // Put in the order we want to proceed jobs | |
86 | const resolutions = [ | |
5c7d6508 | 87 | VideoResolution.H_NOVIDEO, |
06215f15 C |
88 | VideoResolution.H_480P, |
89 | VideoResolution.H_360P, | |
90 | VideoResolution.H_720P, | |
91 | VideoResolution.H_240P, | |
ad3405d0 C |
92 | VideoResolution.H_1080P, |
93 | VideoResolution.H_4K | |
06215f15 C |
94 | ] |
95 | ||
96 | for (const resolution of resolutions) { | |
dca0fe12 | 97 | if (configResolutions[resolution + 'p'] === true && videoFileResolution > resolution) { |
06215f15 C |
98 | resolutionsEnabled.push(resolution) |
99 | } | |
100 | } | |
101 | ||
102 | return resolutionsEnabled | |
103 | } | |
104 | ||
52201311 | 105 | async function getVideoStreamSize (path: string) { |
5ba49f26 | 106 | const videoStream = await getVideoStreamFromFile(path) |
056aa7f2 | 107 | |
3a149e9f C |
108 | return videoStream === null |
109 | ? { width: 0, height: 0 } | |
110 | : { width: videoStream.width, height: videoStream.height } | |
09209296 C |
111 | } |
112 | ||
52201311 C |
113 | async function getVideoStreamCodec (path: string) { |
114 | const videoStream = await getVideoStreamFromFile(path) | |
115 | ||
116 | if (!videoStream) return '' | |
117 | ||
118 | const videoCodec = videoStream.codec_tag_string | |
119 | ||
120 | const baseProfileMatrix = { | |
a1587156 C |
121 | High: '6400', |
122 | Main: '4D40', | |
123 | Baseline: '42E0' | |
52201311 C |
124 | } |
125 | ||
126 | let baseProfile = baseProfileMatrix[videoStream.profile] | |
127 | if (!baseProfile) { | |
128 | logger.warn('Cannot get video profile codec of %s.', path, { videoStream }) | |
129 | baseProfile = baseProfileMatrix['High'] // Fallback | |
130 | } | |
131 | ||
a2b6ec7c C |
132 | let level = videoStream.level.toString(16) |
133 | if (level.length === 1) level = `0${level}` | |
52201311 C |
134 | |
135 | return `${videoCodec}.${baseProfile}${level}` | |
136 | } | |
137 | ||
138 | async function getAudioStreamCodec (path: string) { | |
139 | const { audioStream } = await audio.get(path) | |
140 | ||
141 | if (!audioStream) return '' | |
142 | ||
143 | const audioCodec = audioStream.codec_name | |
49c3bf6f | 144 | if (audioCodec === 'aac') return 'mp4a.40.2' |
52201311 C |
145 | |
146 | logger.warn('Cannot get audio codec of %s.', path, { audioStream }) | |
147 | ||
148 | return 'mp4a.40.2' // Fallback | |
149 | } | |
150 | ||
09209296 | 151 | async function getVideoFileResolution (path: string) { |
52201311 | 152 | const size = await getVideoStreamSize(path) |
09209296 C |
153 | |
154 | return { | |
155 | videoFileResolution: Math.min(size.height, size.width), | |
156 | isPortraitMode: size.height > size.width | |
056aa7f2 | 157 | } |
73c69591 | 158 | } |
14d3270f | 159 | |
73c69591 | 160 | async function getVideoFileFPS (path: string) { |
5ba49f26 | 161 | const videoStream = await getVideoStreamFromFile(path) |
3a149e9f | 162 | if (videoStream === null) return 0 |
5c7d6508 | 163 | |
ef04ae20 | 164 | for (const key of [ 'avg_frame_rate', 'r_frame_rate' ]) { |
a1587156 | 165 | const valuesText: string = videoStream[key] |
73c69591 C |
166 | if (!valuesText) continue |
167 | ||
168 | const [ frames, seconds ] = valuesText.split('/') | |
169 | if (!frames || !seconds) continue | |
170 | ||
171 | const result = parseInt(frames, 10) / parseInt(seconds, 10) | |
3a6f351b | 172 | if (result > 0) return Math.round(result) |
73c69591 C |
173 | } |
174 | ||
175 | return 0 | |
14d3270f C |
176 | } |
177 | ||
7b81edc8 | 178 | async function getMetadataFromFile <T> (path: string, cb = metadata => metadata) { |
8319d6ae | 179 | return new Promise<T>((res, rej) => { |
edb4ffc7 FA |
180 | ffmpeg.ffprobe(path, (err, metadata) => { |
181 | if (err) return rej(err) | |
182 | ||
8319d6ae | 183 | return res(cb(new VideoFileMetadata(metadata))) |
edb4ffc7 FA |
184 | }) |
185 | }) | |
186 | } | |
187 | ||
8319d6ae RK |
188 | async function getVideoFileBitrate (path: string) { |
189 | return getMetadataFromFile<number>(path, metadata => metadata.format.bit_rate) | |
190 | } | |
191 | ||
14d3270f | 192 | function getDurationFromVideoFile (path: string) { |
8319d6ae RK |
193 | return getMetadataFromFile<number>(path, metadata => Math.floor(metadata.format.duration)) |
194 | } | |
14d3270f | 195 | |
8319d6ae RK |
196 | function getVideoStreamFromFile (path: string) { |
197 | return getMetadataFromFile<any>(path, metadata => metadata.streams.find(s => s.codec_type === 'video') || null) | |
14d3270f C |
198 | } |
199 | ||
26670720 C |
200 | async function generateImageFromVideoFile (fromPath: string, folder: string, imageName: string, size: { width: number, height: number }) { |
201 | const pendingImageName = 'pending-' + imageName | |
202 | ||
14d3270f | 203 | const options = { |
26670720 | 204 | filename: pendingImageName, |
14d3270f C |
205 | count: 1, |
206 | folder | |
207 | } | |
208 | ||
26670720 | 209 | const pendingImagePath = join(folder, pendingImageName) |
6fdc553a C |
210 | |
211 | try { | |
212 | await new Promise<string>((res, rej) => { | |
7160878c | 213 | ffmpeg(fromPath, { niceness: FFMPEG_NICE.THUMBNAIL }) |
6fdc553a C |
214 | .on('error', rej) |
215 | .on('end', () => res(imageName)) | |
216 | .thumbnail(options) | |
217 | }) | |
218 | ||
219 | const destination = join(folder, imageName) | |
2fb5b3a5 | 220 | await processImage(pendingImagePath, destination, size) |
6fdc553a | 221 | } catch (err) { |
d5b7d911 | 222 | logger.error('Cannot generate image from video %s.', fromPath, { err }) |
6fdc553a C |
223 | |
224 | try { | |
62689b94 | 225 | await remove(pendingImagePath) |
6fdc553a | 226 | } catch (err) { |
d5b7d911 | 227 | logger.debug('Cannot remove pending image path after generation error.', { err }) |
6fdc553a C |
228 | } |
229 | } | |
14d3270f C |
230 | } |
231 | ||
3a149e9f | 232 | type TranscodeOptionsType = 'hls' | 'quick-transcode' | 'video' | 'merge-audio' | 'only-audio' |
536598cf C |
233 | |
234 | interface BaseTranscodeOptions { | |
235 | type: TranscodeOptionsType | |
14d3270f C |
236 | inputPath: string |
237 | outputPath: string | |
09209296 | 238 | resolution: VideoResolution |
056aa7f2 | 239 | isPortraitMode?: boolean |
536598cf | 240 | } |
09209296 | 241 | |
536598cf C |
242 | interface HLSTranscodeOptions extends BaseTranscodeOptions { |
243 | type: 'hls' | |
d7a25329 | 244 | copyCodecs: boolean |
536598cf | 245 | hlsPlaylist: { |
4c280004 C |
246 | videoFilename: string |
247 | } | |
14d3270f C |
248 | } |
249 | ||
536598cf C |
250 | interface QuickTranscodeOptions extends BaseTranscodeOptions { |
251 | type: 'quick-transcode' | |
252 | } | |
253 | ||
254 | interface VideoTranscodeOptions extends BaseTranscodeOptions { | |
255 | type: 'video' | |
256 | } | |
257 | ||
258 | interface MergeAudioTranscodeOptions extends BaseTranscodeOptions { | |
259 | type: 'merge-audio' | |
260 | audioPath: string | |
261 | } | |
262 | ||
3a149e9f C |
263 | interface OnlyAudioTranscodeOptions extends BaseTranscodeOptions { |
264 | type: 'only-audio' | |
5c7d6508 | 265 | } |
266 | ||
a1587156 C |
267 | type TranscodeOptions = |
268 | HLSTranscodeOptions | |
3a149e9f C |
269 | | VideoTranscodeOptions |
270 | | MergeAudioTranscodeOptions | |
271 | | OnlyAudioTranscodeOptions | |
272 | | QuickTranscodeOptions | |
536598cf | 273 | |
14d3270f | 274 | function transcode (options: TranscodeOptions) { |
73c69591 | 275 | return new Promise<void>(async (res, rej) => { |
cdf4cb9e | 276 | try { |
c6c0fa6c | 277 | let command = getFFmpeg(options.inputPath) |
cdf4cb9e | 278 | .output(options.outputPath) |
14aed608 | 279 | |
536598cf | 280 | if (options.type === 'quick-transcode') { |
a1587156 | 281 | command = buildQuickTranscodeCommand(command) |
536598cf | 282 | } else if (options.type === 'hls') { |
c6c0fa6c | 283 | command = await buildHLSVODCommand(command, options) |
536598cf C |
284 | } else if (options.type === 'merge-audio') { |
285 | command = await buildAudioMergeCommand(command, options) | |
3a149e9f | 286 | } else if (options.type === 'only-audio') { |
a1587156 | 287 | command = buildOnlyAudioCommand(command, options) |
14aed608 C |
288 | } else { |
289 | command = await buildx264Command(command, options) | |
290 | } | |
7160878c | 291 | |
cdf4cb9e C |
292 | command |
293 | .on('error', (err, stdout, stderr) => { | |
294 | logger.error('Error in transcoding job.', { stdout, stderr }) | |
295 | return rej(err) | |
296 | }) | |
7f8f8bdb | 297 | .on('end', () => { |
536598cf | 298 | return fixHLSPlaylistIfNeeded(options) |
7f8f8bdb C |
299 | .then(() => res()) |
300 | .catch(err => rej(err)) | |
301 | }) | |
cdf4cb9e C |
302 | .run() |
303 | } catch (err) { | |
304 | return rej(err) | |
305 | } | |
14d3270f C |
306 | }) |
307 | } | |
308 | ||
7ed2c1a4 | 309 | async function canDoQuickTranscode (path: string): Promise<boolean> { |
5ba49f26 FA |
310 | // NOTE: This could be optimized by running ffprobe only once (but it runs fast anyway) |
311 | const videoStream = await getVideoStreamFromFile(path) | |
312 | const parsedAudio = await audio.get(path) | |
313 | const fps = await getVideoFileFPS(path) | |
314 | const bitRate = await getVideoFileBitrate(path) | |
315 | const resolution = await getVideoFileResolution(path) | |
316 | ||
317 | // check video params | |
5c7d6508 | 318 | if (videoStream == null) return false |
a1587156 C |
319 | if (videoStream['codec_name'] !== 'h264') return false |
320 | if (videoStream['pix_fmt'] !== 'yuv420p') return false | |
1600235a C |
321 | if (fps < VIDEO_TRANSCODING_FPS.MIN || fps > VIDEO_TRANSCODING_FPS.MAX) return false |
322 | if (bitRate > getMaxBitrate(resolution.videoFileResolution, fps, VIDEO_TRANSCODING_FPS)) return false | |
5ba49f26 | 323 | |
3a149e9f | 324 | // check audio params (if audio stream exists) |
5ba49f26 | 325 | if (parsedAudio.audioStream) { |
a1587156 | 326 | if (parsedAudio.audioStream['codec_name'] !== 'aac') return false |
1600235a | 327 | |
a1587156 C |
328 | const maxAudioBitrate = audio.bitrate['aac'](parsedAudio.audioStream['bit_rate']) |
329 | if (maxAudioBitrate !== -1 && parsedAudio.audioStream['bit_rate'] > maxAudioBitrate) return false | |
5ba49f26 | 330 | } |
7ed2c1a4 | 331 | |
5ba49f26 FA |
332 | return true |
333 | } | |
334 | ||
c7f36e4f C |
335 | function getClosestFramerateStandard (fps: number, type: 'HD_STANDARD' | 'STANDARD'): number { |
336 | return VIDEO_TRANSCODING_FPS[type].slice(0) | |
337 | .sort((a, b) => fps % a - fps % b)[0] | |
837666fe RK |
338 | } |
339 | ||
18782242 C |
340 | function convertWebPToJPG (path: string, destination: string): Promise<void> { |
341 | return new Promise<void>(async (res, rej) => { | |
342 | try { | |
343 | const command = ffmpeg(path).output(destination) | |
344 | ||
345 | command.on('error', (err, stdout, stderr) => { | |
346 | logger.error('Error in ffmpeg webp convert process.', { stdout, stderr }) | |
347 | return rej(err) | |
348 | }) | |
349 | .on('end', () => res()) | |
350 | .run() | |
351 | } catch (err) { | |
352 | return rej(err) | |
353 | } | |
354 | }) | |
355 | } | |
356 | ||
fb719404 | 357 | function runLiveTranscoding (rtmpUrl: string, outPath: string, resolutions: number[], deleteSegments: boolean) { |
c6c0fa6c C |
358 | const command = getFFmpeg(rtmpUrl) |
359 | command.inputOption('-fflags nobuffer') | |
360 | ||
361 | const varStreamMap: string[] = [] | |
362 | ||
363 | command.complexFilter([ | |
364 | { | |
365 | inputs: '[v:0]', | |
366 | filter: 'split', | |
367 | options: resolutions.length, | |
368 | outputs: resolutions.map(r => `vtemp${r}`) | |
369 | }, | |
370 | ||
371 | ...resolutions.map(r => ({ | |
372 | inputs: `vtemp${r}`, | |
373 | filter: 'scale', | |
374 | options: `w=-2:h=${r}`, | |
375 | outputs: `vout${r}` | |
376 | })) | |
377 | ]) | |
378 | ||
379 | const liveFPS = VIDEO_TRANSCODING_FPS.AVERAGE | |
380 | ||
381 | command.withFps(liveFPS) | |
382 | ||
383 | command.outputOption('-b_strategy 1') | |
384 | command.outputOption('-bf 16') | |
385 | command.outputOption('-preset superfast') | |
386 | command.outputOption('-level 3.1') | |
387 | command.outputOption('-map_metadata -1') | |
388 | command.outputOption('-pix_fmt yuv420p') | |
389 | ||
390 | for (let i = 0; i < resolutions.length; i++) { | |
391 | const resolution = resolutions[i] | |
392 | ||
393 | command.outputOption(`-map [vout${resolution}]`) | |
394 | command.outputOption(`-c:v:${i} libx264`) | |
395 | command.outputOption(`-b:v:${i} ${getTargetBitrate(resolution, liveFPS, VIDEO_TRANSCODING_FPS)}`) | |
396 | ||
397 | command.outputOption(`-map a:0`) | |
398 | command.outputOption(`-c:a:${i} aac`) | |
399 | ||
400 | varStreamMap.push(`v:${i},a:${i}`) | |
401 | } | |
402 | ||
fb719404 | 403 | addDefaultLiveHLSParams(command, outPath, deleteSegments) |
c6c0fa6c C |
404 | |
405 | command.outputOption('-var_stream_map', varStreamMap.join(' ')) | |
406 | ||
407 | command.run() | |
408 | ||
409 | return command | |
410 | } | |
411 | ||
fb719404 | 412 | function runLiveMuxing (rtmpUrl: string, outPath: string, deleteSegments: boolean) { |
c6c0fa6c C |
413 | const command = getFFmpeg(rtmpUrl) |
414 | command.inputOption('-fflags nobuffer') | |
415 | ||
416 | command.outputOption('-c:v copy') | |
417 | command.outputOption('-c:a copy') | |
418 | command.outputOption('-map 0:a?') | |
419 | command.outputOption('-map 0:v?') | |
420 | ||
fb719404 | 421 | addDefaultLiveHLSParams(command, outPath, deleteSegments) |
c6c0fa6c C |
422 | |
423 | command.run() | |
424 | ||
425 | return command | |
426 | } | |
427 | ||
31c82cd9 C |
428 | async function hlsPlaylistToFragmentedMP4 (hlsDirectory: string, segmentFiles: string[], outputPath: string) { |
429 | const concatFile = 'concat.txt' | |
430 | const concatFilePath = join(hlsDirectory, concatFile) | |
431 | const content = segmentFiles.map(f => 'file ' + f) | |
432 | .join('\n') | |
433 | ||
434 | await writeFile(concatFilePath, content + '\n') | |
435 | ||
436 | const command = getFFmpeg(concatFilePath) | |
437 | command.inputOption('-safe 0') | |
438 | command.inputOption('-f concat') | |
b5b68755 C |
439 | |
440 | command.outputOption('-c copy') | |
441 | command.output(outputPath) | |
442 | ||
443 | command.run() | |
444 | ||
31c82cd9 C |
445 | function cleaner () { |
446 | remove(concatFile) | |
447 | .catch(err => logger.error('Cannot remove concat file in %s.', hlsDirectory, { err })) | |
448 | } | |
449 | ||
b5b68755 | 450 | return new Promise<string>((res, rej) => { |
31c82cd9 C |
451 | command.on('error', err => { |
452 | cleaner() | |
453 | ||
454 | rej(err) | |
455 | }) | |
456 | ||
457 | command.on('end', () => { | |
458 | cleaner() | |
459 | ||
460 | res() | |
461 | }) | |
b5b68755 C |
462 | }) |
463 | } | |
464 | ||
14d3270f C |
465 | // --------------------------------------------------------------------------- |
466 | ||
467 | export { | |
52201311 C |
468 | getVideoStreamCodec, |
469 | getAudioStreamCodec, | |
c6c0fa6c | 470 | runLiveMuxing, |
18782242 | 471 | convertWebPToJPG, |
52201311 | 472 | getVideoStreamSize, |
056aa7f2 | 473 | getVideoFileResolution, |
8319d6ae | 474 | getMetadataFromFile, |
14d3270f | 475 | getDurationFromVideoFile, |
c6c0fa6c | 476 | runLiveTranscoding, |
14d3270f | 477 | generateImageFromVideoFile, |
536598cf C |
478 | TranscodeOptions, |
479 | TranscodeOptionsType, | |
73c69591 | 480 | transcode, |
7160878c | 481 | getVideoFileFPS, |
06215f15 | 482 | computeResolutionsToTranscode, |
edb4ffc7 | 483 | audio, |
b5b68755 | 484 | hlsPlaylistToFragmentedMP4, |
5ba49f26 FA |
485 | getVideoFileBitrate, |
486 | canDoQuickTranscode | |
73c69591 C |
487 | } |
488 | ||
489 | // --------------------------------------------------------------------------- | |
490 | ||
c6c0fa6c C |
491 | function addDefaultX264Params (command: ffmpeg.FfmpegCommand) { |
492 | command.outputOption('-level 3.1') // 3.1 is the minimal resource allocation for our highest supported resolution | |
493 | .outputOption('-b_strategy 1') // NOTE: b-strategy 1 - heuristic algorithm, 16 is optimal B-frames for it | |
494 | .outputOption('-bf 16') // NOTE: Why 16: https://github.com/Chocobozzz/PeerTube/pull/774. b-strategy 2 -> B-frames<16 | |
495 | .outputOption('-pix_fmt yuv420p') // allows import of source material with incompatible pixel formats (e.g. MJPEG video) | |
496 | .outputOption('-map_metadata -1') // strip all metadata | |
497 | } | |
498 | ||
fb719404 C |
499 | function addDefaultLiveHLSParams (command: ffmpeg.FfmpegCommand, outPath: string, deleteSegments: boolean) { |
500 | command.outputOption('-hls_time ' + VIDEO_LIVE.SEGMENT_TIME) | |
501 | command.outputOption('-hls_list_size ' + VIDEO_LIVE.SEGMENTS_LIST_SIZE) | |
502 | ||
503 | if (deleteSegments === true) { | |
504 | command.outputOption('-hls_flags delete_segments') | |
505 | } | |
506 | ||
c6c0fa6c C |
507 | command.outputOption(`-hls_segment_filename ${join(outPath, '%v-%d.ts')}`) |
508 | command.outputOption('-master_pl_name master.m3u8') | |
509 | command.outputOption(`-f hls`) | |
510 | ||
511 | command.output(join(outPath, '%v.m3u8')) | |
512 | } | |
513 | ||
d7a25329 | 514 | async function buildx264Command (command: ffmpeg.FfmpegCommand, options: TranscodeOptions) { |
14aed608 | 515 | let fps = await getVideoFileFPS(options.inputPath) |
14aed608 | 516 | if ( |
06bcfbd9 | 517 | // On small/medium resolutions, limit FPS |
14aed608 C |
518 | options.resolution !== undefined && |
519 | options.resolution < VIDEO_TRANSCODING_FPS.KEEP_ORIGIN_FPS_RESOLUTION_MIN && | |
c7f36e4f | 520 | fps > VIDEO_TRANSCODING_FPS.AVERAGE |
14aed608 | 521 | ) { |
06bcfbd9 | 522 | // Get closest standard framerate by modulo: downsampling has to be done to a divisor of the nominal fps value |
c7f36e4f | 523 | fps = getClosestFramerateStandard(fps, 'STANDARD') |
14aed608 C |
524 | } |
525 | ||
536598cf | 526 | command = await presetH264(command, options.inputPath, options.resolution, fps) |
14aed608 C |
527 | |
528 | if (options.resolution !== undefined) { | |
529 | // '?x720' or '720x?' for example | |
530 | const size = options.isPortraitMode === true ? `${options.resolution}x?` : `?x${options.resolution}` | |
531 | command = command.size(size) | |
532 | } | |
533 | ||
534 | if (fps) { | |
535 | // Hard FPS limits | |
c7f36e4f | 536 | if (fps > VIDEO_TRANSCODING_FPS.MAX) fps = getClosestFramerateStandard(fps, 'HD_STANDARD') |
14aed608 C |
537 | else if (fps < VIDEO_TRANSCODING_FPS.MIN) fps = VIDEO_TRANSCODING_FPS.MIN |
538 | ||
539 | command = command.withFPS(fps) | |
540 | } | |
541 | ||
542 | return command | |
543 | } | |
544 | ||
536598cf C |
545 | async function buildAudioMergeCommand (command: ffmpeg.FfmpegCommand, options: MergeAudioTranscodeOptions) { |
546 | command = command.loop(undefined) | |
547 | ||
548 | command = await presetH264VeryFast(command, options.audioPath, options.resolution) | |
549 | ||
550 | command = command.input(options.audioPath) | |
551 | .videoFilter('scale=trunc(iw/2)*2:trunc(ih/2)*2') // Avoid "height not divisible by 2" error | |
552 | .outputOption('-tune stillimage') | |
553 | .outputOption('-shortest') | |
554 | ||
555 | return command | |
556 | } | |
557 | ||
a1587156 C |
558 | function buildOnlyAudioCommand (command: ffmpeg.FfmpegCommand, options: OnlyAudioTranscodeOptions) { |
559 | command = presetOnlyAudio(command) | |
5c7d6508 | 560 | |
561 | return command | |
562 | } | |
563 | ||
a1587156 C |
564 | function buildQuickTranscodeCommand (command: ffmpeg.FfmpegCommand) { |
565 | command = presetCopy(command) | |
536598cf C |
566 | |
567 | command = command.outputOption('-map_metadata -1') // strip all metadata | |
568 | .outputOption('-movflags faststart') | |
569 | ||
570 | return command | |
571 | } | |
572 | ||
c6c0fa6c | 573 | async function buildHLSVODCommand (command: ffmpeg.FfmpegCommand, options: HLSTranscodeOptions) { |
14aed608 C |
574 | const videoPath = getHLSVideoPath(options) |
575 | ||
a1587156 | 576 | if (options.copyCodecs) command = presetCopy(command) |
1c320673 | 577 | else if (options.resolution === VideoResolution.H_NOVIDEO) command = presetOnlyAudio(command) |
d7a25329 | 578 | else command = await buildx264Command(command, options) |
14aed608 C |
579 | |
580 | command = command.outputOption('-hls_time 4') | |
581 | .outputOption('-hls_list_size 0') | |
582 | .outputOption('-hls_playlist_type vod') | |
583 | .outputOption('-hls_segment_filename ' + videoPath) | |
584 | .outputOption('-hls_segment_type fmp4') | |
585 | .outputOption('-f hls') | |
586 | .outputOption('-hls_flags single_file') | |
587 | ||
588 | return command | |
589 | } | |
590 | ||
536598cf | 591 | function getHLSVideoPath (options: HLSTranscodeOptions) { |
7f8f8bdb C |
592 | return `${dirname(options.outputPath)}/${options.hlsPlaylist.videoFilename}` |
593 | } | |
594 | ||
536598cf C |
595 | async function fixHLSPlaylistIfNeeded (options: TranscodeOptions) { |
596 | if (options.type !== 'hls') return | |
7f8f8bdb | 597 | |
7f8f8bdb C |
598 | const fileContent = await readFile(options.outputPath) |
599 | ||
600 | const videoFileName = options.hlsPlaylist.videoFilename | |
601 | const videoFilePath = getHLSVideoPath(options) | |
602 | ||
536598cf | 603 | // Fix wrong mapping with some ffmpeg versions |
7f8f8bdb C |
604 | const newContent = fileContent.toString() |
605 | .replace(`#EXT-X-MAP:URI="${videoFilePath}",`, `#EXT-X-MAP:URI="${videoFileName}",`) | |
606 | ||
607 | await writeFile(options.outputPath, newContent) | |
608 | } | |
609 | ||
4176e227 RK |
610 | /** |
611 | * A slightly customised version of the 'veryfast' x264 preset | |
612 | * | |
613 | * The veryfast preset is right in the sweet spot of performance | |
614 | * and quality. Superfast and ultrafast will give you better | |
615 | * performance, but then quality is noticeably worse. | |
616 | */ | |
536598cf C |
617 | async function presetH264VeryFast (command: ffmpeg.FfmpegCommand, input: string, resolution: VideoResolution, fps?: number) { |
618 | let localCommand = await presetH264(command, input, resolution, fps) | |
619 | ||
cdf4cb9e | 620 | localCommand = localCommand.outputOption('-preset:v veryfast') |
536598cf | 621 | |
4176e227 RK |
622 | /* |
623 | MAIN reference: https://slhck.info/video/2017/03/01/rate-control.html | |
624 | Our target situation is closer to a livestream than a stream, | |
625 | since we want to reduce as much a possible the encoding burden, | |
536598cf | 626 | although not to the point of a livestream where there is a hard |
4176e227 | 627 | constraint on the frames per second to be encoded. |
4176e227 | 628 | */ |
cdf4cb9e C |
629 | |
630 | return localCommand | |
4176e227 RK |
631 | } |
632 | ||
4176e227 RK |
633 | /** |
634 | * Standard profile, with variable bitrate audio and faststart. | |
635 | * | |
636 | * As for the audio, quality '5' is the highest and ensures 96-112kbps/channel | |
637 | * See https://trac.ffmpeg.org/wiki/Encode/AAC#fdk_vbr | |
638 | */ | |
536598cf | 639 | async function presetH264 (command: ffmpeg.FfmpegCommand, input: string, resolution: VideoResolution, fps?: number) { |
cdf4cb9e | 640 | let localCommand = command |
4176e227 RK |
641 | .format('mp4') |
642 | .videoCodec('libx264') | |
4176e227 | 643 | .outputOption('-movflags faststart') |
4176e227 | 644 | |
c6c0fa6c C |
645 | addDefaultX264Params(localCommand) |
646 | ||
536598cf | 647 | const parsedAudio = await audio.get(input) |
4176e227 | 648 | |
cdf4cb9e C |
649 | if (!parsedAudio.audioStream) { |
650 | localCommand = localCommand.noAudio() | |
651 | } else if ((await checkFFmpegEncoders()).get('libfdk_aac')) { // we favor VBR, if a good AAC encoder is available | |
652 | localCommand = localCommand | |
4176e227 RK |
653 | .audioCodec('libfdk_aac') |
654 | .audioQuality(5) | |
cdf4cb9e | 655 | } else { |
536598cf | 656 | // we try to reduce the ceiling bitrate by making rough matches of bitrates |
cdf4cb9e | 657 | // of course this is far from perfect, but it might save some space in the end |
536598cf C |
658 | localCommand = localCommand.audioCodec('aac') |
659 | ||
a1587156 | 660 | const audioCodecName = parsedAudio.audioStream['codec_name'] |
cdf4cb9e | 661 | |
a1587156 C |
662 | if (audio.bitrate[audioCodecName]) { |
663 | const bitrate = audio.bitrate[audioCodecName](parsedAudio.audioStream['bit_rate']) | |
64e3e270 | 664 | if (bitrate !== undefined && bitrate !== -1) localCommand = localCommand.audioBitrate(bitrate) |
cdf4cb9e | 665 | } |
4176e227 RK |
666 | } |
667 | ||
536598cf C |
668 | if (fps) { |
669 | // Constrained Encoding (VBV) | |
670 | // https://slhck.info/video/2017/03/01/rate-control.html | |
671 | // https://trac.ffmpeg.org/wiki/Limiting%20the%20output%20bitrate | |
672 | const targetBitrate = getTargetBitrate(resolution, fps, VIDEO_TRANSCODING_FPS) | |
673 | localCommand = localCommand.outputOptions([ `-maxrate ${targetBitrate}`, `-bufsize ${targetBitrate * 2}` ]) | |
674 | ||
675 | // Keyframe interval of 2 seconds for faster seeking and resolution switching. | |
676 | // https://streaminglearningcenter.com/blogs/whats-the-right-keyframe-interval.html | |
677 | // https://superuser.com/a/908325 | |
678 | localCommand = localCommand.outputOption(`-g ${fps * 2}`) | |
679 | } | |
bcf21a37 | 680 | |
cdf4cb9e | 681 | return localCommand |
4176e227 | 682 | } |
14aed608 | 683 | |
a1587156 | 684 | function presetCopy (command: ffmpeg.FfmpegCommand): ffmpeg.FfmpegCommand { |
14aed608 C |
685 | return command |
686 | .format('mp4') | |
687 | .videoCodec('copy') | |
688 | .audioCodec('copy') | |
689 | } | |
5c7d6508 | 690 | |
a1587156 | 691 | function presetOnlyAudio (command: ffmpeg.FfmpegCommand): ffmpeg.FfmpegCommand { |
5c7d6508 | 692 | return command |
693 | .format('mp4') | |
694 | .audioCodec('copy') | |
695 | .noVideo() | |
696 | } | |
c6c0fa6c C |
697 | |
698 | function getFFmpeg (input: string) { | |
699 | // We set cwd explicitly because ffmpeg appears to create temporary files when trancoding which fails in read-only file systems | |
700 | const command = ffmpeg(input, { niceness: FFMPEG_NICE.TRANSCODING, cwd: CONFIG.STORAGE.TMP_DIR }) | |
701 | ||
702 | if (CONFIG.TRANSCODING.THREADS > 0) { | |
703 | // If we don't set any threads ffmpeg will chose automatically | |
704 | command.outputOption('-threads ' + CONFIG.TRANSCODING.THREADS) | |
705 | } | |
706 | ||
707 | return command | |
708 | } |