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Commit | Line | Data |
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14d3270f | 1 | import * as ffmpeg from 'fluent-ffmpeg' |
09209296 | 2 | import { dirname, join } from 'path' |
5ba49f26 | 3 | import { getTargetBitrate, getMaxBitrate, VideoResolution } from '../../shared/models/videos' |
6dd9de95 | 4 | import { FFMPEG_NICE, VIDEO_TRANSCODING_FPS } from '../initializers/constants' |
26670720 | 5 | import { processImage } from './image-utils' |
6fdc553a | 6 | import { logger } from './logger' |
e5565833 | 7 | import { checkFFmpegEncoders } from '../initializers/checker-before-init' |
6dd9de95 C |
8 | import { readFile, remove, writeFile } from 'fs-extra' |
9 | import { CONFIG } from '../initializers/config' | |
14d3270f | 10 | |
06215f15 C |
11 | function computeResolutionsToTranscode (videoFileHeight: number) { |
12 | const resolutionsEnabled: number[] = [] | |
13 | const configResolutions = CONFIG.TRANSCODING.RESOLUTIONS | |
14 | ||
15 | // Put in the order we want to proceed jobs | |
16 | const resolutions = [ | |
5c7d6508 | 17 | VideoResolution.H_NOVIDEO, |
06215f15 C |
18 | VideoResolution.H_480P, |
19 | VideoResolution.H_360P, | |
20 | VideoResolution.H_720P, | |
21 | VideoResolution.H_240P, | |
ad3405d0 C |
22 | VideoResolution.H_1080P, |
23 | VideoResolution.H_4K | |
06215f15 C |
24 | ] |
25 | ||
26 | for (const resolution of resolutions) { | |
27 | if (configResolutions[ resolution + 'p' ] === true && videoFileHeight > resolution) { | |
28 | resolutionsEnabled.push(resolution) | |
29 | } | |
30 | } | |
31 | ||
32 | return resolutionsEnabled | |
33 | } | |
34 | ||
09209296 | 35 | async function getVideoFileSize (path: string) { |
5ba49f26 | 36 | const videoStream = await getVideoStreamFromFile(path) |
056aa7f2 | 37 | |
5c7d6508 | 38 | return videoStream == null |
39 | ? { | |
40 | width: 0, | |
41 | height: 0 | |
42 | } | |
43 | : { | |
44 | width: videoStream.width, | |
45 | height: videoStream.height | |
46 | } | |
09209296 C |
47 | } |
48 | ||
49 | async function getVideoFileResolution (path: string) { | |
50 | const size = await getVideoFileSize(path) | |
51 | ||
52 | return { | |
53 | videoFileResolution: Math.min(size.height, size.width), | |
54 | isPortraitMode: size.height > size.width | |
056aa7f2 | 55 | } |
73c69591 | 56 | } |
14d3270f | 57 | |
73c69591 | 58 | async function getVideoFileFPS (path: string) { |
5ba49f26 | 59 | const videoStream = await getVideoStreamFromFile(path) |
73c69591 | 60 | |
5c7d6508 | 61 | if (videoStream == null) { |
62 | return 0 | |
63 | } | |
64 | ||
ef04ae20 | 65 | for (const key of [ 'avg_frame_rate', 'r_frame_rate' ]) { |
73c69591 C |
66 | const valuesText: string = videoStream[key] |
67 | if (!valuesText) continue | |
68 | ||
69 | const [ frames, seconds ] = valuesText.split('/') | |
70 | if (!frames || !seconds) continue | |
71 | ||
72 | const result = parseInt(frames, 10) / parseInt(seconds, 10) | |
3a6f351b | 73 | if (result > 0) return Math.round(result) |
73c69591 C |
74 | } |
75 | ||
76 | return 0 | |
14d3270f C |
77 | } |
78 | ||
edb4ffc7 FA |
79 | async function getVideoFileBitrate (path: string) { |
80 | return new Promise<number>((res, rej) => { | |
81 | ffmpeg.ffprobe(path, (err, metadata) => { | |
82 | if (err) return rej(err) | |
83 | ||
84 | return res(metadata.format.bit_rate) | |
85 | }) | |
86 | }) | |
87 | } | |
88 | ||
14d3270f C |
89 | function getDurationFromVideoFile (path: string) { |
90 | return new Promise<number>((res, rej) => { | |
91 | ffmpeg.ffprobe(path, (err, metadata) => { | |
92 | if (err) return rej(err) | |
93 | ||
94 | return res(Math.floor(metadata.format.duration)) | |
95 | }) | |
96 | }) | |
97 | } | |
98 | ||
26670720 C |
99 | async function generateImageFromVideoFile (fromPath: string, folder: string, imageName: string, size: { width: number, height: number }) { |
100 | const pendingImageName = 'pending-' + imageName | |
101 | ||
14d3270f | 102 | const options = { |
26670720 | 103 | filename: pendingImageName, |
14d3270f C |
104 | count: 1, |
105 | folder | |
106 | } | |
107 | ||
26670720 | 108 | const pendingImagePath = join(folder, pendingImageName) |
6fdc553a C |
109 | |
110 | try { | |
111 | await new Promise<string>((res, rej) => { | |
7160878c | 112 | ffmpeg(fromPath, { niceness: FFMPEG_NICE.THUMBNAIL }) |
6fdc553a C |
113 | .on('error', rej) |
114 | .on('end', () => res(imageName)) | |
115 | .thumbnail(options) | |
116 | }) | |
117 | ||
118 | const destination = join(folder, imageName) | |
2fb5b3a5 | 119 | await processImage(pendingImagePath, destination, size) |
6fdc553a | 120 | } catch (err) { |
d5b7d911 | 121 | logger.error('Cannot generate image from video %s.', fromPath, { err }) |
6fdc553a C |
122 | |
123 | try { | |
62689b94 | 124 | await remove(pendingImagePath) |
6fdc553a | 125 | } catch (err) { |
d5b7d911 | 126 | logger.debug('Cannot remove pending image path after generation error.', { err }) |
6fdc553a C |
127 | } |
128 | } | |
14d3270f C |
129 | } |
130 | ||
5c7d6508 | 131 | type TranscodeOptionsType = 'hls' | 'quick-transcode' | 'video' | 'merge-audio' | 'split-audio' |
536598cf C |
132 | |
133 | interface BaseTranscodeOptions { | |
134 | type: TranscodeOptionsType | |
14d3270f C |
135 | inputPath: string |
136 | outputPath: string | |
09209296 | 137 | resolution: VideoResolution |
056aa7f2 | 138 | isPortraitMode?: boolean |
536598cf | 139 | } |
09209296 | 140 | |
536598cf C |
141 | interface HLSTranscodeOptions extends BaseTranscodeOptions { |
142 | type: 'hls' | |
d7a25329 | 143 | copyCodecs: boolean |
536598cf | 144 | hlsPlaylist: { |
4c280004 C |
145 | videoFilename: string |
146 | } | |
14d3270f C |
147 | } |
148 | ||
536598cf C |
149 | interface QuickTranscodeOptions extends BaseTranscodeOptions { |
150 | type: 'quick-transcode' | |
151 | } | |
152 | ||
153 | interface VideoTranscodeOptions extends BaseTranscodeOptions { | |
154 | type: 'video' | |
155 | } | |
156 | ||
157 | interface MergeAudioTranscodeOptions extends BaseTranscodeOptions { | |
158 | type: 'merge-audio' | |
159 | audioPath: string | |
160 | } | |
161 | ||
5c7d6508 | 162 | interface SplitAudioTranscodeOptions extends BaseTranscodeOptions { |
163 | type: 'split-audio' | |
164 | } | |
165 | ||
166 | type TranscodeOptions = HLSTranscodeOptions | VideoTranscodeOptions | MergeAudioTranscodeOptions | SplitAudioTranscodeOptions | QuickTranscodeOptions | |
536598cf | 167 | |
14d3270f | 168 | function transcode (options: TranscodeOptions) { |
73c69591 | 169 | return new Promise<void>(async (res, rej) => { |
cdf4cb9e | 170 | try { |
cdf4cb9e C |
171 | let command = ffmpeg(options.inputPath, { niceness: FFMPEG_NICE.TRANSCODING }) |
172 | .output(options.outputPath) | |
14aed608 | 173 | |
536598cf C |
174 | if (options.type === 'quick-transcode') { |
175 | command = await buildQuickTranscodeCommand(command) | |
176 | } else if (options.type === 'hls') { | |
14aed608 | 177 | command = await buildHLSCommand(command, options) |
536598cf C |
178 | } else if (options.type === 'merge-audio') { |
179 | command = await buildAudioMergeCommand(command, options) | |
5c7d6508 | 180 | } else if (options.type === 'split-audio') { |
181 | command = await buildAudioSplitCommand(command, options) | |
14aed608 C |
182 | } else { |
183 | command = await buildx264Command(command, options) | |
184 | } | |
7160878c | 185 | |
cdf4cb9e C |
186 | if (CONFIG.TRANSCODING.THREADS > 0) { |
187 | // if we don't set any threads ffmpeg will chose automatically | |
188 | command = command.outputOption('-threads ' + CONFIG.TRANSCODING.THREADS) | |
189 | } | |
14d3270f | 190 | |
cdf4cb9e C |
191 | command |
192 | .on('error', (err, stdout, stderr) => { | |
193 | logger.error('Error in transcoding job.', { stdout, stderr }) | |
194 | return rej(err) | |
195 | }) | |
7f8f8bdb | 196 | .on('end', () => { |
536598cf | 197 | return fixHLSPlaylistIfNeeded(options) |
7f8f8bdb C |
198 | .then(() => res()) |
199 | .catch(err => rej(err)) | |
200 | }) | |
cdf4cb9e C |
201 | .run() |
202 | } catch (err) { | |
203 | return rej(err) | |
204 | } | |
14d3270f C |
205 | }) |
206 | } | |
207 | ||
7ed2c1a4 | 208 | async function canDoQuickTranscode (path: string): Promise<boolean> { |
5ba49f26 FA |
209 | // NOTE: This could be optimized by running ffprobe only once (but it runs fast anyway) |
210 | const videoStream = await getVideoStreamFromFile(path) | |
211 | const parsedAudio = await audio.get(path) | |
212 | const fps = await getVideoFileFPS(path) | |
213 | const bitRate = await getVideoFileBitrate(path) | |
214 | const resolution = await getVideoFileResolution(path) | |
215 | ||
216 | // check video params | |
5c7d6508 | 217 | if (videoStream == null) return false |
1600235a | 218 | if (videoStream[ 'codec_name' ] !== 'h264') return false |
f6e0de3f | 219 | if (videoStream[ 'pix_fmt' ] !== 'yuv420p') return false |
1600235a C |
220 | if (fps < VIDEO_TRANSCODING_FPS.MIN || fps > VIDEO_TRANSCODING_FPS.MAX) return false |
221 | if (bitRate > getMaxBitrate(resolution.videoFileResolution, fps, VIDEO_TRANSCODING_FPS)) return false | |
5ba49f26 FA |
222 | |
223 | // check audio params (if audio stream exists) | |
224 | if (parsedAudio.audioStream) { | |
1600235a C |
225 | if (parsedAudio.audioStream[ 'codec_name' ] !== 'aac') return false |
226 | ||
5ba49f26 | 227 | const maxAudioBitrate = audio.bitrate[ 'aac' ](parsedAudio.audioStream[ 'bit_rate' ]) |
1600235a | 228 | if (maxAudioBitrate !== -1 && parsedAudio.audioStream[ 'bit_rate' ] > maxAudioBitrate) return false |
5ba49f26 | 229 | } |
7ed2c1a4 | 230 | |
5ba49f26 FA |
231 | return true |
232 | } | |
233 | ||
14d3270f C |
234 | // --------------------------------------------------------------------------- |
235 | ||
236 | export { | |
09209296 | 237 | getVideoFileSize, |
056aa7f2 | 238 | getVideoFileResolution, |
14d3270f C |
239 | getDurationFromVideoFile, |
240 | generateImageFromVideoFile, | |
536598cf C |
241 | TranscodeOptions, |
242 | TranscodeOptionsType, | |
73c69591 | 243 | transcode, |
7160878c | 244 | getVideoFileFPS, |
06215f15 | 245 | computeResolutionsToTranscode, |
edb4ffc7 | 246 | audio, |
5ba49f26 FA |
247 | getVideoFileBitrate, |
248 | canDoQuickTranscode | |
73c69591 C |
249 | } |
250 | ||
251 | // --------------------------------------------------------------------------- | |
252 | ||
d7a25329 | 253 | async function buildx264Command (command: ffmpeg.FfmpegCommand, options: TranscodeOptions) { |
14aed608 C |
254 | let fps = await getVideoFileFPS(options.inputPath) |
255 | // On small/medium resolutions, limit FPS | |
256 | if ( | |
257 | options.resolution !== undefined && | |
258 | options.resolution < VIDEO_TRANSCODING_FPS.KEEP_ORIGIN_FPS_RESOLUTION_MIN && | |
259 | fps > VIDEO_TRANSCODING_FPS.AVERAGE | |
260 | ) { | |
261 | fps = VIDEO_TRANSCODING_FPS.AVERAGE | |
262 | } | |
263 | ||
536598cf | 264 | command = await presetH264(command, options.inputPath, options.resolution, fps) |
14aed608 C |
265 | |
266 | if (options.resolution !== undefined) { | |
267 | // '?x720' or '720x?' for example | |
268 | const size = options.isPortraitMode === true ? `${options.resolution}x?` : `?x${options.resolution}` | |
269 | command = command.size(size) | |
270 | } | |
271 | ||
272 | if (fps) { | |
273 | // Hard FPS limits | |
274 | if (fps > VIDEO_TRANSCODING_FPS.MAX) fps = VIDEO_TRANSCODING_FPS.MAX | |
275 | else if (fps < VIDEO_TRANSCODING_FPS.MIN) fps = VIDEO_TRANSCODING_FPS.MIN | |
276 | ||
277 | command = command.withFPS(fps) | |
278 | } | |
279 | ||
280 | return command | |
281 | } | |
282 | ||
536598cf C |
283 | async function buildAudioMergeCommand (command: ffmpeg.FfmpegCommand, options: MergeAudioTranscodeOptions) { |
284 | command = command.loop(undefined) | |
285 | ||
286 | command = await presetH264VeryFast(command, options.audioPath, options.resolution) | |
287 | ||
288 | command = command.input(options.audioPath) | |
289 | .videoFilter('scale=trunc(iw/2)*2:trunc(ih/2)*2') // Avoid "height not divisible by 2" error | |
290 | .outputOption('-tune stillimage') | |
291 | .outputOption('-shortest') | |
292 | ||
293 | return command | |
294 | } | |
295 | ||
5c7d6508 | 296 | async function buildAudioSplitCommand (command: ffmpeg.FfmpegCommand, options: SplitAudioTranscodeOptions) { |
297 | command = await presetAudioSplit(command) | |
298 | ||
299 | return command | |
300 | } | |
301 | ||
536598cf C |
302 | async function buildQuickTranscodeCommand (command: ffmpeg.FfmpegCommand) { |
303 | command = await presetCopy(command) | |
304 | ||
305 | command = command.outputOption('-map_metadata -1') // strip all metadata | |
306 | .outputOption('-movflags faststart') | |
307 | ||
308 | return command | |
309 | } | |
310 | ||
311 | async function buildHLSCommand (command: ffmpeg.FfmpegCommand, options: HLSTranscodeOptions) { | |
14aed608 C |
312 | const videoPath = getHLSVideoPath(options) |
313 | ||
d7a25329 C |
314 | if (options.copyCodecs) command = await presetCopy(command) |
315 | else command = await buildx264Command(command, options) | |
14aed608 C |
316 | |
317 | command = command.outputOption('-hls_time 4') | |
318 | .outputOption('-hls_list_size 0') | |
319 | .outputOption('-hls_playlist_type vod') | |
320 | .outputOption('-hls_segment_filename ' + videoPath) | |
321 | .outputOption('-hls_segment_type fmp4') | |
322 | .outputOption('-f hls') | |
323 | .outputOption('-hls_flags single_file') | |
324 | ||
325 | return command | |
326 | } | |
327 | ||
536598cf | 328 | function getHLSVideoPath (options: HLSTranscodeOptions) { |
7f8f8bdb C |
329 | return `${dirname(options.outputPath)}/${options.hlsPlaylist.videoFilename}` |
330 | } | |
331 | ||
536598cf C |
332 | async function fixHLSPlaylistIfNeeded (options: TranscodeOptions) { |
333 | if (options.type !== 'hls') return | |
7f8f8bdb | 334 | |
7f8f8bdb C |
335 | const fileContent = await readFile(options.outputPath) |
336 | ||
337 | const videoFileName = options.hlsPlaylist.videoFilename | |
338 | const videoFilePath = getHLSVideoPath(options) | |
339 | ||
536598cf | 340 | // Fix wrong mapping with some ffmpeg versions |
7f8f8bdb C |
341 | const newContent = fileContent.toString() |
342 | .replace(`#EXT-X-MAP:URI="${videoFilePath}",`, `#EXT-X-MAP:URI="${videoFileName}",`) | |
343 | ||
344 | await writeFile(options.outputPath, newContent) | |
345 | } | |
346 | ||
5ba49f26 | 347 | function getVideoStreamFromFile (path: string) { |
73c69591 C |
348 | return new Promise<any>((res, rej) => { |
349 | ffmpeg.ffprobe(path, (err, metadata) => { | |
350 | if (err) return rej(err) | |
351 | ||
352 | const videoStream = metadata.streams.find(s => s.codec_type === 'video') | |
5c7d6508 | 353 | //if (!videoStream) return rej(new Error('Cannot find video stream of ' + path)) |
73c69591 C |
354 | |
355 | return res(videoStream) | |
356 | }) | |
357 | }) | |
14d3270f | 358 | } |
4176e227 RK |
359 | |
360 | /** | |
361 | * A slightly customised version of the 'veryfast' x264 preset | |
362 | * | |
363 | * The veryfast preset is right in the sweet spot of performance | |
364 | * and quality. Superfast and ultrafast will give you better | |
365 | * performance, but then quality is noticeably worse. | |
366 | */ | |
536598cf C |
367 | async function presetH264VeryFast (command: ffmpeg.FfmpegCommand, input: string, resolution: VideoResolution, fps?: number) { |
368 | let localCommand = await presetH264(command, input, resolution, fps) | |
369 | ||
cdf4cb9e | 370 | localCommand = localCommand.outputOption('-preset:v veryfast') |
536598cf | 371 | |
4176e227 RK |
372 | /* |
373 | MAIN reference: https://slhck.info/video/2017/03/01/rate-control.html | |
374 | Our target situation is closer to a livestream than a stream, | |
375 | since we want to reduce as much a possible the encoding burden, | |
536598cf | 376 | although not to the point of a livestream where there is a hard |
4176e227 | 377 | constraint on the frames per second to be encoded. |
4176e227 | 378 | */ |
cdf4cb9e C |
379 | |
380 | return localCommand | |
4176e227 RK |
381 | } |
382 | ||
4176e227 RK |
383 | /** |
384 | * A toolbox to play with audio | |
385 | */ | |
386 | namespace audio { | |
536598cf | 387 | export const get = (option: string) => { |
4176e227 RK |
388 | // without position, ffprobe considers the last input only |
389 | // we make it consider the first input only | |
4a5ccac5 | 390 | // if you pass a file path to pos, then ffprobe acts on that file directly |
7160878c | 391 | return new Promise<{ absolutePath: string, audioStream?: any }>((res, rej) => { |
cdf4cb9e C |
392 | |
393 | function parseFfprobe (err: any, data: ffmpeg.FfprobeData) { | |
7160878c RK |
394 | if (err) return rej(err) |
395 | ||
396 | if ('streams' in data) { | |
cdf4cb9e | 397 | const audioStream = data.streams.find(stream => stream['codec_type'] === 'audio') |
7160878c RK |
398 | if (audioStream) { |
399 | return res({ | |
400 | absolutePath: data.format.filename, | |
401 | audioStream | |
402 | }) | |
4a5ccac5 | 403 | } |
7160878c | 404 | } |
cdf4cb9e | 405 | |
7160878c | 406 | return res({ absolutePath: data.format.filename }) |
cdf4cb9e C |
407 | } |
408 | ||
536598cf | 409 | return ffmpeg.ffprobe(option, parseFfprobe) |
4a5ccac5 | 410 | }) |
4176e227 RK |
411 | } |
412 | ||
413 | export namespace bitrate { | |
eed24d26 | 414 | const baseKbitrate = 384 |
4176e227 | 415 | |
9b474844 | 416 | const toBits = (kbits: number) => kbits * 8000 |
4176e227 RK |
417 | |
418 | export const aac = (bitrate: number): number => { | |
419 | switch (true) { | |
9b474844 C |
420 | case bitrate > toBits(baseKbitrate): |
421 | return baseKbitrate | |
422 | ||
423 | default: | |
424 | return -1 // we interpret it as a signal to copy the audio stream as is | |
4176e227 RK |
425 | } |
426 | } | |
427 | ||
428 | export const mp3 = (bitrate: number): number => { | |
7160878c RK |
429 | /* |
430 | a 192kbit/sec mp3 doesn't hold as much information as a 192kbit/sec aac. | |
431 | That's why, when using aac, we can go to lower kbit/sec. The equivalences | |
432 | made here are not made to be accurate, especially with good mp3 encoders. | |
433 | */ | |
4176e227 | 434 | switch (true) { |
9b474844 C |
435 | case bitrate <= toBits(192): |
436 | return 128 | |
437 | ||
438 | case bitrate <= toBits(384): | |
439 | return 256 | |
440 | ||
441 | default: | |
442 | return baseKbitrate | |
4176e227 RK |
443 | } |
444 | } | |
445 | } | |
446 | } | |
447 | ||
448 | /** | |
449 | * Standard profile, with variable bitrate audio and faststart. | |
450 | * | |
451 | * As for the audio, quality '5' is the highest and ensures 96-112kbps/channel | |
452 | * See https://trac.ffmpeg.org/wiki/Encode/AAC#fdk_vbr | |
453 | */ | |
536598cf | 454 | async function presetH264 (command: ffmpeg.FfmpegCommand, input: string, resolution: VideoResolution, fps?: number) { |
cdf4cb9e | 455 | let localCommand = command |
4176e227 RK |
456 | .format('mp4') |
457 | .videoCodec('libx264') | |
458 | .outputOption('-level 3.1') // 3.1 is the minimal ressource allocation for our highest supported resolution | |
459 | .outputOption('-b_strategy 1') // NOTE: b-strategy 1 - heuristic algorythm, 16 is optimal B-frames for it | |
460 | .outputOption('-bf 16') // NOTE: Why 16: https://github.com/Chocobozzz/PeerTube/pull/774. b-strategy 2 -> B-frames<16 | |
408f50eb | 461 | .outputOption('-pix_fmt yuv420p') // allows import of source material with incompatible pixel formats (e.g. MJPEG video) |
4a5ccac5 | 462 | .outputOption('-map_metadata -1') // strip all metadata |
4176e227 | 463 | .outputOption('-movflags faststart') |
4176e227 | 464 | |
536598cf | 465 | const parsedAudio = await audio.get(input) |
4176e227 | 466 | |
cdf4cb9e C |
467 | if (!parsedAudio.audioStream) { |
468 | localCommand = localCommand.noAudio() | |
469 | } else if ((await checkFFmpegEncoders()).get('libfdk_aac')) { // we favor VBR, if a good AAC encoder is available | |
470 | localCommand = localCommand | |
4176e227 RK |
471 | .audioCodec('libfdk_aac') |
472 | .audioQuality(5) | |
cdf4cb9e | 473 | } else { |
536598cf | 474 | // we try to reduce the ceiling bitrate by making rough matches of bitrates |
cdf4cb9e | 475 | // of course this is far from perfect, but it might save some space in the end |
536598cf C |
476 | localCommand = localCommand.audioCodec('aac') |
477 | ||
cdf4cb9e | 478 | const audioCodecName = parsedAudio.audioStream[ 'codec_name' ] |
cdf4cb9e | 479 | |
536598cf C |
480 | if (audio.bitrate[ audioCodecName ]) { |
481 | const bitrate = audio.bitrate[ audioCodecName ](parsedAudio.audioStream[ 'bit_rate' ]) | |
64e3e270 | 482 | if (bitrate !== undefined && bitrate !== -1) localCommand = localCommand.audioBitrate(bitrate) |
cdf4cb9e | 483 | } |
4176e227 RK |
484 | } |
485 | ||
536598cf C |
486 | if (fps) { |
487 | // Constrained Encoding (VBV) | |
488 | // https://slhck.info/video/2017/03/01/rate-control.html | |
489 | // https://trac.ffmpeg.org/wiki/Limiting%20the%20output%20bitrate | |
490 | const targetBitrate = getTargetBitrate(resolution, fps, VIDEO_TRANSCODING_FPS) | |
491 | localCommand = localCommand.outputOptions([ `-maxrate ${targetBitrate}`, `-bufsize ${targetBitrate * 2}` ]) | |
492 | ||
493 | // Keyframe interval of 2 seconds for faster seeking and resolution switching. | |
494 | // https://streaminglearningcenter.com/blogs/whats-the-right-keyframe-interval.html | |
495 | // https://superuser.com/a/908325 | |
496 | localCommand = localCommand.outputOption(`-g ${fps * 2}`) | |
497 | } | |
bcf21a37 | 498 | |
cdf4cb9e | 499 | return localCommand |
4176e227 | 500 | } |
14aed608 C |
501 | |
502 | async function presetCopy (command: ffmpeg.FfmpegCommand): Promise<ffmpeg.FfmpegCommand> { | |
503 | return command | |
504 | .format('mp4') | |
505 | .videoCodec('copy') | |
506 | .audioCodec('copy') | |
507 | } | |
5c7d6508 | 508 | |
509 | ||
510 | async function presetAudioSplit (command: ffmpeg.FfmpegCommand): Promise<ffmpeg.FfmpegCommand> { | |
511 | return command | |
512 | .format('mp4') | |
513 | .audioCodec('copy') | |
514 | .noVideo() | |
515 | } |