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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 | |
3a149e9f C |
38 | return videoStream === null |
39 | ? { width: 0, height: 0 } | |
40 | : { width: videoStream.width, height: videoStream.height } | |
09209296 C |
41 | } |
42 | ||
43 | async function getVideoFileResolution (path: string) { | |
44 | const size = await getVideoFileSize(path) | |
45 | ||
46 | return { | |
47 | videoFileResolution: Math.min(size.height, size.width), | |
48 | isPortraitMode: size.height > size.width | |
056aa7f2 | 49 | } |
73c69591 | 50 | } |
14d3270f | 51 | |
73c69591 | 52 | async function getVideoFileFPS (path: string) { |
5ba49f26 | 53 | const videoStream = await getVideoStreamFromFile(path) |
3a149e9f | 54 | if (videoStream === null) return 0 |
5c7d6508 | 55 | |
ef04ae20 | 56 | for (const key of [ 'avg_frame_rate', 'r_frame_rate' ]) { |
3a149e9f | 57 | const valuesText: string = videoStream[ key ] |
73c69591 C |
58 | if (!valuesText) continue |
59 | ||
60 | const [ frames, seconds ] = valuesText.split('/') | |
61 | if (!frames || !seconds) continue | |
62 | ||
63 | const result = parseInt(frames, 10) / parseInt(seconds, 10) | |
3a6f351b | 64 | if (result > 0) return Math.round(result) |
73c69591 C |
65 | } |
66 | ||
67 | return 0 | |
14d3270f C |
68 | } |
69 | ||
edb4ffc7 FA |
70 | async function getVideoFileBitrate (path: string) { |
71 | return new Promise<number>((res, rej) => { | |
72 | ffmpeg.ffprobe(path, (err, metadata) => { | |
73 | if (err) return rej(err) | |
74 | ||
75 | return res(metadata.format.bit_rate) | |
76 | }) | |
77 | }) | |
78 | } | |
79 | ||
14d3270f C |
80 | function getDurationFromVideoFile (path: string) { |
81 | return new Promise<number>((res, rej) => { | |
82 | ffmpeg.ffprobe(path, (err, metadata) => { | |
83 | if (err) return rej(err) | |
84 | ||
85 | return res(Math.floor(metadata.format.duration)) | |
86 | }) | |
87 | }) | |
88 | } | |
89 | ||
26670720 C |
90 | async function generateImageFromVideoFile (fromPath: string, folder: string, imageName: string, size: { width: number, height: number }) { |
91 | const pendingImageName = 'pending-' + imageName | |
92 | ||
14d3270f | 93 | const options = { |
26670720 | 94 | filename: pendingImageName, |
14d3270f C |
95 | count: 1, |
96 | folder | |
97 | } | |
98 | ||
26670720 | 99 | const pendingImagePath = join(folder, pendingImageName) |
6fdc553a C |
100 | |
101 | try { | |
102 | await new Promise<string>((res, rej) => { | |
7160878c | 103 | ffmpeg(fromPath, { niceness: FFMPEG_NICE.THUMBNAIL }) |
6fdc553a C |
104 | .on('error', rej) |
105 | .on('end', () => res(imageName)) | |
106 | .thumbnail(options) | |
107 | }) | |
108 | ||
109 | const destination = join(folder, imageName) | |
2fb5b3a5 | 110 | await processImage(pendingImagePath, destination, size) |
6fdc553a | 111 | } catch (err) { |
d5b7d911 | 112 | logger.error('Cannot generate image from video %s.', fromPath, { err }) |
6fdc553a C |
113 | |
114 | try { | |
62689b94 | 115 | await remove(pendingImagePath) |
6fdc553a | 116 | } catch (err) { |
d5b7d911 | 117 | logger.debug('Cannot remove pending image path after generation error.', { err }) |
6fdc553a C |
118 | } |
119 | } | |
14d3270f C |
120 | } |
121 | ||
3a149e9f | 122 | type TranscodeOptionsType = 'hls' | 'quick-transcode' | 'video' | 'merge-audio' | 'only-audio' |
536598cf C |
123 | |
124 | interface BaseTranscodeOptions { | |
125 | type: TranscodeOptionsType | |
14d3270f C |
126 | inputPath: string |
127 | outputPath: string | |
09209296 | 128 | resolution: VideoResolution |
056aa7f2 | 129 | isPortraitMode?: boolean |
536598cf | 130 | } |
09209296 | 131 | |
536598cf C |
132 | interface HLSTranscodeOptions extends BaseTranscodeOptions { |
133 | type: 'hls' | |
d7a25329 | 134 | copyCodecs: boolean |
536598cf | 135 | hlsPlaylist: { |
4c280004 C |
136 | videoFilename: string |
137 | } | |
14d3270f C |
138 | } |
139 | ||
536598cf C |
140 | interface QuickTranscodeOptions extends BaseTranscodeOptions { |
141 | type: 'quick-transcode' | |
142 | } | |
143 | ||
144 | interface VideoTranscodeOptions extends BaseTranscodeOptions { | |
145 | type: 'video' | |
146 | } | |
147 | ||
148 | interface MergeAudioTranscodeOptions extends BaseTranscodeOptions { | |
149 | type: 'merge-audio' | |
150 | audioPath: string | |
151 | } | |
152 | ||
3a149e9f C |
153 | interface OnlyAudioTranscodeOptions extends BaseTranscodeOptions { |
154 | type: 'only-audio' | |
5c7d6508 | 155 | } |
156 | ||
3a149e9f C |
157 | type TranscodeOptions = HLSTranscodeOptions |
158 | | VideoTranscodeOptions | |
159 | | MergeAudioTranscodeOptions | |
160 | | OnlyAudioTranscodeOptions | |
161 | | QuickTranscodeOptions | |
536598cf | 162 | |
14d3270f | 163 | function transcode (options: TranscodeOptions) { |
73c69591 | 164 | return new Promise<void>(async (res, rej) => { |
cdf4cb9e | 165 | try { |
cdf4cb9e C |
166 | let command = ffmpeg(options.inputPath, { niceness: FFMPEG_NICE.TRANSCODING }) |
167 | .output(options.outputPath) | |
14aed608 | 168 | |
536598cf C |
169 | if (options.type === 'quick-transcode') { |
170 | command = await buildQuickTranscodeCommand(command) | |
171 | } else if (options.type === 'hls') { | |
14aed608 | 172 | command = await buildHLSCommand(command, options) |
536598cf C |
173 | } else if (options.type === 'merge-audio') { |
174 | command = await buildAudioMergeCommand(command, options) | |
3a149e9f C |
175 | } else if (options.type === 'only-audio') { |
176 | command = await buildOnlyAudioCommand(command, options) | |
14aed608 C |
177 | } else { |
178 | command = await buildx264Command(command, options) | |
179 | } | |
7160878c | 180 | |
cdf4cb9e C |
181 | if (CONFIG.TRANSCODING.THREADS > 0) { |
182 | // if we don't set any threads ffmpeg will chose automatically | |
183 | command = command.outputOption('-threads ' + CONFIG.TRANSCODING.THREADS) | |
184 | } | |
14d3270f | 185 | |
cdf4cb9e C |
186 | command |
187 | .on('error', (err, stdout, stderr) => { | |
188 | logger.error('Error in transcoding job.', { stdout, stderr }) | |
189 | return rej(err) | |
190 | }) | |
7f8f8bdb | 191 | .on('end', () => { |
536598cf | 192 | return fixHLSPlaylistIfNeeded(options) |
7f8f8bdb C |
193 | .then(() => res()) |
194 | .catch(err => rej(err)) | |
195 | }) | |
cdf4cb9e C |
196 | .run() |
197 | } catch (err) { | |
198 | return rej(err) | |
199 | } | |
14d3270f C |
200 | }) |
201 | } | |
202 | ||
7ed2c1a4 | 203 | async function canDoQuickTranscode (path: string): Promise<boolean> { |
5ba49f26 FA |
204 | // NOTE: This could be optimized by running ffprobe only once (but it runs fast anyway) |
205 | const videoStream = await getVideoStreamFromFile(path) | |
206 | const parsedAudio = await audio.get(path) | |
207 | const fps = await getVideoFileFPS(path) | |
208 | const bitRate = await getVideoFileBitrate(path) | |
209 | const resolution = await getVideoFileResolution(path) | |
210 | ||
211 | // check video params | |
5c7d6508 | 212 | if (videoStream == null) return false |
1600235a | 213 | if (videoStream[ 'codec_name' ] !== 'h264') return false |
f6e0de3f | 214 | if (videoStream[ 'pix_fmt' ] !== 'yuv420p') return false |
1600235a C |
215 | if (fps < VIDEO_TRANSCODING_FPS.MIN || fps > VIDEO_TRANSCODING_FPS.MAX) return false |
216 | if (bitRate > getMaxBitrate(resolution.videoFileResolution, fps, VIDEO_TRANSCODING_FPS)) return false | |
5ba49f26 | 217 | |
3a149e9f | 218 | // check audio params (if audio stream exists) |
5ba49f26 | 219 | if (parsedAudio.audioStream) { |
1600235a C |
220 | if (parsedAudio.audioStream[ 'codec_name' ] !== 'aac') return false |
221 | ||
5ba49f26 | 222 | const maxAudioBitrate = audio.bitrate[ 'aac' ](parsedAudio.audioStream[ 'bit_rate' ]) |
1600235a | 223 | if (maxAudioBitrate !== -1 && parsedAudio.audioStream[ 'bit_rate' ] > maxAudioBitrate) return false |
5ba49f26 | 224 | } |
7ed2c1a4 | 225 | |
5ba49f26 FA |
226 | return true |
227 | } | |
228 | ||
14d3270f C |
229 | // --------------------------------------------------------------------------- |
230 | ||
231 | export { | |
09209296 | 232 | getVideoFileSize, |
056aa7f2 | 233 | getVideoFileResolution, |
14d3270f C |
234 | getDurationFromVideoFile, |
235 | generateImageFromVideoFile, | |
536598cf C |
236 | TranscodeOptions, |
237 | TranscodeOptionsType, | |
73c69591 | 238 | transcode, |
7160878c | 239 | getVideoFileFPS, |
06215f15 | 240 | computeResolutionsToTranscode, |
edb4ffc7 | 241 | audio, |
5ba49f26 FA |
242 | getVideoFileBitrate, |
243 | canDoQuickTranscode | |
73c69591 C |
244 | } |
245 | ||
246 | // --------------------------------------------------------------------------- | |
247 | ||
d7a25329 | 248 | async function buildx264Command (command: ffmpeg.FfmpegCommand, options: TranscodeOptions) { |
14aed608 C |
249 | let fps = await getVideoFileFPS(options.inputPath) |
250 | // On small/medium resolutions, limit FPS | |
251 | if ( | |
252 | options.resolution !== undefined && | |
253 | options.resolution < VIDEO_TRANSCODING_FPS.KEEP_ORIGIN_FPS_RESOLUTION_MIN && | |
254 | fps > VIDEO_TRANSCODING_FPS.AVERAGE | |
255 | ) { | |
256 | fps = VIDEO_TRANSCODING_FPS.AVERAGE | |
257 | } | |
258 | ||
536598cf | 259 | command = await presetH264(command, options.inputPath, options.resolution, fps) |
14aed608 C |
260 | |
261 | if (options.resolution !== undefined) { | |
262 | // '?x720' or '720x?' for example | |
263 | const size = options.isPortraitMode === true ? `${options.resolution}x?` : `?x${options.resolution}` | |
264 | command = command.size(size) | |
265 | } | |
266 | ||
267 | if (fps) { | |
268 | // Hard FPS limits | |
269 | if (fps > VIDEO_TRANSCODING_FPS.MAX) fps = VIDEO_TRANSCODING_FPS.MAX | |
270 | else if (fps < VIDEO_TRANSCODING_FPS.MIN) fps = VIDEO_TRANSCODING_FPS.MIN | |
271 | ||
272 | command = command.withFPS(fps) | |
273 | } | |
274 | ||
275 | return command | |
276 | } | |
277 | ||
536598cf C |
278 | async function buildAudioMergeCommand (command: ffmpeg.FfmpegCommand, options: MergeAudioTranscodeOptions) { |
279 | command = command.loop(undefined) | |
280 | ||
281 | command = await presetH264VeryFast(command, options.audioPath, options.resolution) | |
282 | ||
283 | command = command.input(options.audioPath) | |
284 | .videoFilter('scale=trunc(iw/2)*2:trunc(ih/2)*2') // Avoid "height not divisible by 2" error | |
285 | .outputOption('-tune stillimage') | |
286 | .outputOption('-shortest') | |
287 | ||
288 | return command | |
289 | } | |
290 | ||
3a149e9f C |
291 | async function buildOnlyAudioCommand (command: ffmpeg.FfmpegCommand, options: OnlyAudioTranscodeOptions) { |
292 | command = await presetOnlyAudio(command) | |
5c7d6508 | 293 | |
294 | return command | |
295 | } | |
296 | ||
536598cf C |
297 | async function buildQuickTranscodeCommand (command: ffmpeg.FfmpegCommand) { |
298 | command = await presetCopy(command) | |
299 | ||
300 | command = command.outputOption('-map_metadata -1') // strip all metadata | |
301 | .outputOption('-movflags faststart') | |
302 | ||
303 | return command | |
304 | } | |
305 | ||
306 | async function buildHLSCommand (command: ffmpeg.FfmpegCommand, options: HLSTranscodeOptions) { | |
14aed608 C |
307 | const videoPath = getHLSVideoPath(options) |
308 | ||
d7a25329 C |
309 | if (options.copyCodecs) command = await presetCopy(command) |
310 | else command = await buildx264Command(command, options) | |
14aed608 C |
311 | |
312 | command = command.outputOption('-hls_time 4') | |
313 | .outputOption('-hls_list_size 0') | |
314 | .outputOption('-hls_playlist_type vod') | |
315 | .outputOption('-hls_segment_filename ' + videoPath) | |
316 | .outputOption('-hls_segment_type fmp4') | |
317 | .outputOption('-f hls') | |
318 | .outputOption('-hls_flags single_file') | |
319 | ||
320 | return command | |
321 | } | |
322 | ||
536598cf | 323 | function getHLSVideoPath (options: HLSTranscodeOptions) { |
7f8f8bdb C |
324 | return `${dirname(options.outputPath)}/${options.hlsPlaylist.videoFilename}` |
325 | } | |
326 | ||
536598cf C |
327 | async function fixHLSPlaylistIfNeeded (options: TranscodeOptions) { |
328 | if (options.type !== 'hls') return | |
7f8f8bdb | 329 | |
7f8f8bdb C |
330 | const fileContent = await readFile(options.outputPath) |
331 | ||
332 | const videoFileName = options.hlsPlaylist.videoFilename | |
333 | const videoFilePath = getHLSVideoPath(options) | |
334 | ||
536598cf | 335 | // Fix wrong mapping with some ffmpeg versions |
7f8f8bdb C |
336 | const newContent = fileContent.toString() |
337 | .replace(`#EXT-X-MAP:URI="${videoFilePath}",`, `#EXT-X-MAP:URI="${videoFileName}",`) | |
338 | ||
339 | await writeFile(options.outputPath, newContent) | |
340 | } | |
341 | ||
5ba49f26 | 342 | function getVideoStreamFromFile (path: string) { |
73c69591 C |
343 | return new Promise<any>((res, rej) => { |
344 | ffmpeg.ffprobe(path, (err, metadata) => { | |
345 | if (err) return rej(err) | |
346 | ||
347 | const videoStream = metadata.streams.find(s => s.codec_type === 'video') | |
3a149e9f | 348 | return res(videoStream || null) |
73c69591 C |
349 | }) |
350 | }) | |
14d3270f | 351 | } |
4176e227 RK |
352 | |
353 | /** | |
354 | * A slightly customised version of the 'veryfast' x264 preset | |
355 | * | |
356 | * The veryfast preset is right in the sweet spot of performance | |
357 | * and quality. Superfast and ultrafast will give you better | |
358 | * performance, but then quality is noticeably worse. | |
359 | */ | |
536598cf C |
360 | async function presetH264VeryFast (command: ffmpeg.FfmpegCommand, input: string, resolution: VideoResolution, fps?: number) { |
361 | let localCommand = await presetH264(command, input, resolution, fps) | |
362 | ||
cdf4cb9e | 363 | localCommand = localCommand.outputOption('-preset:v veryfast') |
536598cf | 364 | |
4176e227 RK |
365 | /* |
366 | MAIN reference: https://slhck.info/video/2017/03/01/rate-control.html | |
367 | Our target situation is closer to a livestream than a stream, | |
368 | since we want to reduce as much a possible the encoding burden, | |
536598cf | 369 | although not to the point of a livestream where there is a hard |
4176e227 | 370 | constraint on the frames per second to be encoded. |
4176e227 | 371 | */ |
cdf4cb9e C |
372 | |
373 | return localCommand | |
4176e227 RK |
374 | } |
375 | ||
4176e227 RK |
376 | /** |
377 | * A toolbox to play with audio | |
378 | */ | |
379 | namespace audio { | |
3a149e9f | 380 | export const get = (videoPath: string) => { |
4176e227 RK |
381 | // without position, ffprobe considers the last input only |
382 | // we make it consider the first input only | |
4a5ccac5 | 383 | // if you pass a file path to pos, then ffprobe acts on that file directly |
7160878c | 384 | return new Promise<{ absolutePath: string, audioStream?: any }>((res, rej) => { |
cdf4cb9e C |
385 | |
386 | function parseFfprobe (err: any, data: ffmpeg.FfprobeData) { | |
7160878c RK |
387 | if (err) return rej(err) |
388 | ||
389 | if ('streams' in data) { | |
3a149e9f | 390 | const audioStream = data.streams.find(stream => stream[ 'codec_type' ] === 'audio') |
7160878c RK |
391 | if (audioStream) { |
392 | return res({ | |
393 | absolutePath: data.format.filename, | |
394 | audioStream | |
395 | }) | |
4a5ccac5 | 396 | } |
7160878c | 397 | } |
cdf4cb9e | 398 | |
7160878c | 399 | return res({ absolutePath: data.format.filename }) |
cdf4cb9e C |
400 | } |
401 | ||
3a149e9f | 402 | return ffmpeg.ffprobe(videoPath, parseFfprobe) |
4a5ccac5 | 403 | }) |
4176e227 RK |
404 | } |
405 | ||
406 | export namespace bitrate { | |
eed24d26 | 407 | const baseKbitrate = 384 |
4176e227 | 408 | |
9b474844 | 409 | const toBits = (kbits: number) => kbits * 8000 |
4176e227 RK |
410 | |
411 | export const aac = (bitrate: number): number => { | |
412 | switch (true) { | |
9b474844 C |
413 | case bitrate > toBits(baseKbitrate): |
414 | return baseKbitrate | |
415 | ||
416 | default: | |
417 | return -1 // we interpret it as a signal to copy the audio stream as is | |
4176e227 RK |
418 | } |
419 | } | |
420 | ||
421 | export const mp3 = (bitrate: number): number => { | |
7160878c RK |
422 | /* |
423 | a 192kbit/sec mp3 doesn't hold as much information as a 192kbit/sec aac. | |
424 | That's why, when using aac, we can go to lower kbit/sec. The equivalences | |
425 | made here are not made to be accurate, especially with good mp3 encoders. | |
426 | */ | |
4176e227 | 427 | switch (true) { |
9b474844 C |
428 | case bitrate <= toBits(192): |
429 | return 128 | |
430 | ||
431 | case bitrate <= toBits(384): | |
432 | return 256 | |
433 | ||
434 | default: | |
435 | return baseKbitrate | |
4176e227 RK |
436 | } |
437 | } | |
438 | } | |
439 | } | |
440 | ||
441 | /** | |
442 | * Standard profile, with variable bitrate audio and faststart. | |
443 | * | |
444 | * As for the audio, quality '5' is the highest and ensures 96-112kbps/channel | |
445 | * See https://trac.ffmpeg.org/wiki/Encode/AAC#fdk_vbr | |
446 | */ | |
536598cf | 447 | async function presetH264 (command: ffmpeg.FfmpegCommand, input: string, resolution: VideoResolution, fps?: number) { |
cdf4cb9e | 448 | let localCommand = command |
4176e227 RK |
449 | .format('mp4') |
450 | .videoCodec('libx264') | |
451 | .outputOption('-level 3.1') // 3.1 is the minimal ressource allocation for our highest supported resolution | |
452 | .outputOption('-b_strategy 1') // NOTE: b-strategy 1 - heuristic algorythm, 16 is optimal B-frames for it | |
453 | .outputOption('-bf 16') // NOTE: Why 16: https://github.com/Chocobozzz/PeerTube/pull/774. b-strategy 2 -> B-frames<16 | |
408f50eb | 454 | .outputOption('-pix_fmt yuv420p') // allows import of source material with incompatible pixel formats (e.g. MJPEG video) |
4a5ccac5 | 455 | .outputOption('-map_metadata -1') // strip all metadata |
4176e227 | 456 | .outputOption('-movflags faststart') |
4176e227 | 457 | |
536598cf | 458 | const parsedAudio = await audio.get(input) |
4176e227 | 459 | |
cdf4cb9e C |
460 | if (!parsedAudio.audioStream) { |
461 | localCommand = localCommand.noAudio() | |
462 | } else if ((await checkFFmpegEncoders()).get('libfdk_aac')) { // we favor VBR, if a good AAC encoder is available | |
463 | localCommand = localCommand | |
4176e227 RK |
464 | .audioCodec('libfdk_aac') |
465 | .audioQuality(5) | |
cdf4cb9e | 466 | } else { |
536598cf | 467 | // we try to reduce the ceiling bitrate by making rough matches of bitrates |
cdf4cb9e | 468 | // of course this is far from perfect, but it might save some space in the end |
536598cf C |
469 | localCommand = localCommand.audioCodec('aac') |
470 | ||
cdf4cb9e | 471 | const audioCodecName = parsedAudio.audioStream[ 'codec_name' ] |
cdf4cb9e | 472 | |
536598cf C |
473 | if (audio.bitrate[ audioCodecName ]) { |
474 | const bitrate = audio.bitrate[ audioCodecName ](parsedAudio.audioStream[ 'bit_rate' ]) | |
64e3e270 | 475 | if (bitrate !== undefined && bitrate !== -1) localCommand = localCommand.audioBitrate(bitrate) |
cdf4cb9e | 476 | } |
4176e227 RK |
477 | } |
478 | ||
536598cf C |
479 | if (fps) { |
480 | // Constrained Encoding (VBV) | |
481 | // https://slhck.info/video/2017/03/01/rate-control.html | |
482 | // https://trac.ffmpeg.org/wiki/Limiting%20the%20output%20bitrate | |
483 | const targetBitrate = getTargetBitrate(resolution, fps, VIDEO_TRANSCODING_FPS) | |
484 | localCommand = localCommand.outputOptions([ `-maxrate ${targetBitrate}`, `-bufsize ${targetBitrate * 2}` ]) | |
485 | ||
486 | // Keyframe interval of 2 seconds for faster seeking and resolution switching. | |
487 | // https://streaminglearningcenter.com/blogs/whats-the-right-keyframe-interval.html | |
488 | // https://superuser.com/a/908325 | |
489 | localCommand = localCommand.outputOption(`-g ${fps * 2}`) | |
490 | } | |
bcf21a37 | 491 | |
cdf4cb9e | 492 | return localCommand |
4176e227 | 493 | } |
14aed608 C |
494 | |
495 | async function presetCopy (command: ffmpeg.FfmpegCommand): Promise<ffmpeg.FfmpegCommand> { | |
496 | return command | |
497 | .format('mp4') | |
498 | .videoCodec('copy') | |
499 | .audioCodec('copy') | |
500 | } | |
5c7d6508 | 501 | |
3a149e9f | 502 | async function presetOnlyAudio (command: ffmpeg.FfmpegCommand): Promise<ffmpeg.FfmpegCommand> { |
5c7d6508 | 503 | return command |
504 | .format('mp4') | |
505 | .audioCodec('copy') | |
506 | .noVideo() | |
507 | } |