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1 | import * as ffmpeg from 'fluent-ffmpeg' | |
2 | import { join } from 'path' | |
3 | import { VideoResolution } from '../../shared/models/videos' | |
4 | import { CONFIG, FFMPEG_NICE, VIDEO_TRANSCODING_FPS } from '../initializers' | |
5 | import { processImage } from './image-utils' | |
6 | import { logger } from './logger' | |
7 | import { checkFFmpegEncoders } from '../initializers/checker-before-init' | |
8 | import { remove } from 'fs-extra' | |
9 | ||
10 | function computeResolutionsToTranscode (videoFileHeight: number) { | |
11 | const resolutionsEnabled: number[] = [] | |
12 | const configResolutions = CONFIG.TRANSCODING.RESOLUTIONS | |
13 | ||
14 | // Put in the order we want to proceed jobs | |
15 | const resolutions = [ | |
16 | VideoResolution.H_480P, | |
17 | VideoResolution.H_360P, | |
18 | VideoResolution.H_720P, | |
19 | VideoResolution.H_240P, | |
20 | VideoResolution.H_1080P | |
21 | ] | |
22 | ||
23 | for (const resolution of resolutions) { | |
24 | if (configResolutions[ resolution + 'p' ] === true && videoFileHeight > resolution) { | |
25 | resolutionsEnabled.push(resolution) | |
26 | } | |
27 | } | |
28 | ||
29 | return resolutionsEnabled | |
30 | } | |
31 | ||
32 | async function getVideoFileResolution (path: string) { | |
33 | const videoStream = await getVideoFileStream(path) | |
34 | ||
35 | return { | |
36 | videoFileResolution: Math.min(videoStream.height, videoStream.width), | |
37 | isPortraitMode: videoStream.height > videoStream.width | |
38 | } | |
39 | } | |
40 | ||
41 | async function getVideoFileFPS (path: string) { | |
42 | const videoStream = await getVideoFileStream(path) | |
43 | ||
44 | for (const key of [ 'r_frame_rate' , 'avg_frame_rate' ]) { | |
45 | const valuesText: string = videoStream[key] | |
46 | if (!valuesText) continue | |
47 | ||
48 | const [ frames, seconds ] = valuesText.split('/') | |
49 | if (!frames || !seconds) continue | |
50 | ||
51 | const result = parseInt(frames, 10) / parseInt(seconds, 10) | |
52 | if (result > 0) return Math.round(result) | |
53 | } | |
54 | ||
55 | return 0 | |
56 | } | |
57 | ||
58 | function getDurationFromVideoFile (path: string) { | |
59 | return new Promise<number>((res, rej) => { | |
60 | ffmpeg.ffprobe(path, (err, metadata) => { | |
61 | if (err) return rej(err) | |
62 | ||
63 | return res(Math.floor(metadata.format.duration)) | |
64 | }) | |
65 | }) | |
66 | } | |
67 | ||
68 | async function generateImageFromVideoFile (fromPath: string, folder: string, imageName: string, size: { width: number, height: number }) { | |
69 | const pendingImageName = 'pending-' + imageName | |
70 | ||
71 | const options = { | |
72 | filename: pendingImageName, | |
73 | count: 1, | |
74 | folder | |
75 | } | |
76 | ||
77 | const pendingImagePath = join(folder, pendingImageName) | |
78 | ||
79 | try { | |
80 | await new Promise<string>((res, rej) => { | |
81 | ffmpeg(fromPath, { niceness: FFMPEG_NICE.THUMBNAIL }) | |
82 | .on('error', rej) | |
83 | .on('end', () => res(imageName)) | |
84 | .thumbnail(options) | |
85 | }) | |
86 | ||
87 | const destination = join(folder, imageName) | |
88 | await processImage({ path: pendingImagePath }, destination, size) | |
89 | } catch (err) { | |
90 | logger.error('Cannot generate image from video %s.', fromPath, { err }) | |
91 | ||
92 | try { | |
93 | await remove(pendingImagePath) | |
94 | } catch (err) { | |
95 | logger.debug('Cannot remove pending image path after generation error.', { err }) | |
96 | } | |
97 | } | |
98 | } | |
99 | ||
100 | type TranscodeOptions = { | |
101 | inputPath: string | |
102 | outputPath: string | |
103 | resolution?: VideoResolution | |
104 | isPortraitMode?: boolean | |
105 | } | |
106 | ||
107 | function transcode (options: TranscodeOptions) { | |
108 | return new Promise<void>(async (res, rej) => { | |
109 | let command = ffmpeg(options.inputPath, { niceness: FFMPEG_NICE.TRANSCODING }) | |
110 | .output(options.outputPath) | |
111 | .preset(standard) | |
112 | ||
113 | if (CONFIG.TRANSCODING.THREADS > 0) { | |
114 | // if we don't set any threads ffmpeg will chose automatically | |
115 | command = command.outputOption('-threads ' + CONFIG.TRANSCODING.THREADS) | |
116 | } | |
117 | ||
118 | let fps = await getVideoFileFPS(options.inputPath) | |
119 | if (options.resolution !== undefined) { | |
120 | // '?x720' or '720x?' for example | |
121 | const size = options.isPortraitMode === true ? `${options.resolution}x?` : `?x${options.resolution}` | |
122 | command = command.size(size) | |
123 | ||
124 | // On small/medium resolutions, limit FPS | |
125 | if ( | |
126 | options.resolution < VIDEO_TRANSCODING_FPS.KEEP_ORIGIN_FPS_RESOLUTION_MIN && | |
127 | fps > VIDEO_TRANSCODING_FPS.AVERAGE | |
128 | ) { | |
129 | fps = VIDEO_TRANSCODING_FPS.AVERAGE | |
130 | } | |
131 | } | |
132 | ||
133 | if (fps) { | |
134 | // Hard FPS limits | |
135 | if (fps > VIDEO_TRANSCODING_FPS.MAX) fps = VIDEO_TRANSCODING_FPS.MAX | |
136 | else if (fps < VIDEO_TRANSCODING_FPS.MIN) fps = VIDEO_TRANSCODING_FPS.MIN | |
137 | ||
138 | command = command.withFPS(fps) | |
139 | } | |
140 | ||
141 | command | |
142 | .on('error', (err, stdout, stderr) => { | |
143 | logger.error('Error in transcoding job.', { stdout, stderr }) | |
144 | return rej(err) | |
145 | }) | |
146 | .on('end', res) | |
147 | .run() | |
148 | }) | |
149 | } | |
150 | ||
151 | // --------------------------------------------------------------------------- | |
152 | ||
153 | export { | |
154 | getVideoFileResolution, | |
155 | getDurationFromVideoFile, | |
156 | generateImageFromVideoFile, | |
157 | transcode, | |
158 | getVideoFileFPS, | |
159 | computeResolutionsToTranscode, | |
160 | audio | |
161 | } | |
162 | ||
163 | // --------------------------------------------------------------------------- | |
164 | ||
165 | function getVideoFileStream (path: string) { | |
166 | return new Promise<any>((res, rej) => { | |
167 | ffmpeg.ffprobe(path, (err, metadata) => { | |
168 | if (err) return rej(err) | |
169 | ||
170 | const videoStream = metadata.streams.find(s => s.codec_type === 'video') | |
171 | if (!videoStream) throw new Error('Cannot find video stream of ' + path) | |
172 | ||
173 | return res(videoStream) | |
174 | }) | |
175 | }) | |
176 | } | |
177 | ||
178 | /** | |
179 | * A slightly customised version of the 'veryfast' x264 preset | |
180 | * | |
181 | * The veryfast preset is right in the sweet spot of performance | |
182 | * and quality. Superfast and ultrafast will give you better | |
183 | * performance, but then quality is noticeably worse. | |
184 | */ | |
185 | function veryfast (_ffmpeg) { | |
186 | _ffmpeg | |
187 | .preset(standard) | |
188 | .outputOption('-preset:v veryfast') | |
189 | .outputOption(['--aq-mode=2', '--aq-strength=1.3']) | |
190 | /* | |
191 | MAIN reference: https://slhck.info/video/2017/03/01/rate-control.html | |
192 | Our target situation is closer to a livestream than a stream, | |
193 | since we want to reduce as much a possible the encoding burden, | |
194 | altough not to the point of a livestream where there is a hard | |
195 | constraint on the frames per second to be encoded. | |
196 | ||
197 | why '--aq-mode=2 --aq-strength=1.3' instead of '-profile:v main'? | |
198 | Make up for most of the loss of grain and macroblocking | |
199 | with less computing power. | |
200 | */ | |
201 | } | |
202 | ||
203 | /** | |
204 | * A preset optimised for a stillimage audio video | |
205 | */ | |
206 | function audio (_ffmpeg) { | |
207 | _ffmpeg | |
208 | .preset(veryfast) | |
209 | .outputOption('-tune stillimage') | |
210 | } | |
211 | ||
212 | /** | |
213 | * A toolbox to play with audio | |
214 | */ | |
215 | namespace audio { | |
216 | export const get = (_ffmpeg, pos: number | string = 0) => { | |
217 | // without position, ffprobe considers the last input only | |
218 | // we make it consider the first input only | |
219 | // if you pass a file path to pos, then ffprobe acts on that file directly | |
220 | return new Promise<{ absolutePath: string, audioStream?: any }>((res, rej) => { | |
221 | _ffmpeg.ffprobe(pos, (err,data) => { | |
222 | if (err) return rej(err) | |
223 | ||
224 | if ('streams' in data) { | |
225 | const audioStream = data['streams'].find(stream => stream['codec_type'] === 'audio') | |
226 | if (audioStream) { | |
227 | return res({ | |
228 | absolutePath: data.format.filename, | |
229 | audioStream | |
230 | }) | |
231 | } | |
232 | } | |
233 | return res({ absolutePath: data.format.filename }) | |
234 | }) | |
235 | }) | |
236 | } | |
237 | ||
238 | export namespace bitrate { | |
239 | const baseKbitrate = 384 | |
240 | ||
241 | const toBits = (kbits: number): number => { return kbits * 8000 } | |
242 | ||
243 | export const aac = (bitrate: number): number => { | |
244 | switch (true) { | |
245 | case bitrate > toBits(baseKbitrate): | |
246 | return baseKbitrate | |
247 | default: | |
248 | return -1 // we interpret it as a signal to copy the audio stream as is | |
249 | } | |
250 | } | |
251 | ||
252 | export const mp3 = (bitrate: number): number => { | |
253 | /* | |
254 | a 192kbit/sec mp3 doesn't hold as much information as a 192kbit/sec aac. | |
255 | That's why, when using aac, we can go to lower kbit/sec. The equivalences | |
256 | made here are not made to be accurate, especially with good mp3 encoders. | |
257 | */ | |
258 | switch (true) { | |
259 | case bitrate <= toBits(192): | |
260 | return 128 | |
261 | case bitrate <= toBits(384): | |
262 | return 256 | |
263 | default: | |
264 | return baseKbitrate | |
265 | } | |
266 | } | |
267 | } | |
268 | } | |
269 | ||
270 | /** | |
271 | * Standard profile, with variable bitrate audio and faststart. | |
272 | * | |
273 | * As for the audio, quality '5' is the highest and ensures 96-112kbps/channel | |
274 | * See https://trac.ffmpeg.org/wiki/Encode/AAC#fdk_vbr | |
275 | */ | |
276 | async function standard (_ffmpeg) { | |
277 | let localFfmpeg = _ffmpeg | |
278 | .format('mp4') | |
279 | .videoCodec('libx264') | |
280 | .outputOption('-level 3.1') // 3.1 is the minimal ressource allocation for our highest supported resolution | |
281 | .outputOption('-b_strategy 1') // NOTE: b-strategy 1 - heuristic algorythm, 16 is optimal B-frames for it | |
282 | .outputOption('-bf 16') // NOTE: Why 16: https://github.com/Chocobozzz/PeerTube/pull/774. b-strategy 2 -> B-frames<16 | |
283 | .outputOption('-map_metadata -1') // strip all metadata | |
284 | .outputOption('-movflags faststart') | |
285 | const _audio = await audio.get(localFfmpeg) | |
286 | ||
287 | if (!_audio.audioStream) { | |
288 | return localFfmpeg.noAudio() | |
289 | } | |
290 | ||
291 | // we favor VBR, if a good AAC encoder is available | |
292 | if ((await checkFFmpegEncoders()).get('libfdk_aac')) { | |
293 | return localFfmpeg | |
294 | .audioCodec('libfdk_aac') | |
295 | .audioQuality(5) | |
296 | } | |
297 | ||
298 | // we try to reduce the ceiling bitrate by making rough correspondances of bitrates | |
299 | // of course this is far from perfect, but it might save some space in the end | |
300 | const audioCodecName = _audio.audioStream['codec_name'] | |
301 | let bitrate: number | |
302 | if (audio.bitrate[audioCodecName]) { | |
303 | bitrate = audio.bitrate[audioCodecName](_audio.audioStream['bit_rate']) | |
304 | ||
305 | if (bitrate === -1) return localFfmpeg.audioCodec('copy') | |
306 | } | |
307 | ||
308 | if (bitrate !== undefined) return localFfmpeg.audioBitrate(bitrate) | |
309 | ||
310 | return localFfmpeg | |
311 | } |