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daf6e480 C |
1 | import * as ffmpeg from 'fluent-ffmpeg' |
2 | import { VideoFileMetadata } from '@shared/models/videos/video-file-metadata' | |
3 | import { getMaxBitrate, VideoResolution } from '../../shared/models/videos' | |
4 | import { CONFIG } from '../initializers/config' | |
5 | import { VIDEO_TRANSCODING_FPS } from '../initializers/constants' | |
6 | import { logger } from './logger' | |
7 | ||
8 | function ffprobePromise (path: string) { | |
9 | return new Promise<ffmpeg.FfprobeData>((res, rej) => { | |
10 | ffmpeg.ffprobe(path, (err, data) => { | |
11 | if (err) return rej(err) | |
12 | ||
13 | return res(data) | |
14 | }) | |
15 | }) | |
16 | } | |
17 | ||
18 | async function getAudioStream (videoPath: string, existingProbe?: ffmpeg.FfprobeData) { | |
19 | // without position, ffprobe considers the last input only | |
20 | // we make it consider the first input only | |
21 | // if you pass a file path to pos, then ffprobe acts on that file directly | |
22 | const data = existingProbe || await ffprobePromise(videoPath) | |
23 | ||
24 | if (Array.isArray(data.streams)) { | |
25 | const audioStream = data.streams.find(stream => stream['codec_type'] === 'audio') | |
26 | ||
27 | if (audioStream) { | |
28 | return { | |
29 | absolutePath: data.format.filename, | |
30 | audioStream, | |
31 | bitrate: parseInt(audioStream['bit_rate'] + '', 10) | |
32 | } | |
33 | } | |
34 | } | |
35 | ||
36 | return { absolutePath: data.format.filename } | |
37 | } | |
38 | ||
39 | function getMaxAudioBitrate (type: 'aac' | 'mp3' | string, bitrate: number) { | |
33ff70ba C |
40 | const maxKBitrate = 384 |
41 | const kToBits = (kbits: number) => kbits * 1000 | |
42 | ||
43 | // If we did not manage to get the bitrate, use an average value | |
44 | if (!bitrate) return 256 | |
daf6e480 C |
45 | |
46 | if (type === 'aac') { | |
47 | switch (true) { | |
33ff70ba C |
48 | case bitrate > kToBits(maxKBitrate): |
49 | return maxKBitrate | |
daf6e480 C |
50 | |
51 | default: | |
52 | return -1 // we interpret it as a signal to copy the audio stream as is | |
53 | } | |
54 | } | |
55 | ||
33ff70ba C |
56 | /* |
57 | a 192kbit/sec mp3 doesn't hold as much information as a 192kbit/sec aac. | |
58 | That's why, when using aac, we can go to lower kbit/sec. The equivalences | |
59 | made here are not made to be accurate, especially with good mp3 encoders. | |
60 | */ | |
61 | switch (true) { | |
62 | case bitrate <= kToBits(192): | |
63 | return 128 | |
daf6e480 | 64 | |
33ff70ba C |
65 | case bitrate <= kToBits(384): |
66 | return 256 | |
daf6e480 | 67 | |
33ff70ba C |
68 | default: |
69 | return maxKBitrate | |
daf6e480 | 70 | } |
daf6e480 C |
71 | } |
72 | ||
73 | async function getVideoStreamSize (path: string, existingProbe?: ffmpeg.FfprobeData) { | |
74 | const videoStream = await getVideoStreamFromFile(path, existingProbe) | |
75 | ||
76 | return videoStream === null | |
77 | ? { width: 0, height: 0 } | |
78 | : { width: videoStream.width, height: videoStream.height } | |
79 | } | |
80 | ||
81 | async function getVideoStreamCodec (path: string) { | |
82 | const videoStream = await getVideoStreamFromFile(path) | |
83 | ||
84 | if (!videoStream) return '' | |
85 | ||
86 | const videoCodec = videoStream.codec_tag_string | |
87 | ||
88 | const baseProfileMatrix = { | |
89 | High: '6400', | |
90 | Main: '4D40', | |
91 | Baseline: '42E0' | |
92 | } | |
93 | ||
94 | let baseProfile = baseProfileMatrix[videoStream.profile] | |
95 | if (!baseProfile) { | |
96 | logger.warn('Cannot get video profile codec of %s.', path, { videoStream }) | |
97 | baseProfile = baseProfileMatrix['High'] // Fallback | |
98 | } | |
99 | ||
100 | let level = videoStream.level.toString(16) | |
101 | if (level.length === 1) level = `0${level}` | |
102 | ||
103 | return `${videoCodec}.${baseProfile}${level}` | |
104 | } | |
105 | ||
106 | async function getAudioStreamCodec (path: string, existingProbe?: ffmpeg.FfprobeData) { | |
107 | const { audioStream } = await getAudioStream(path, existingProbe) | |
108 | ||
109 | if (!audioStream) return '' | |
110 | ||
111 | const audioCodec = audioStream.codec_name | |
112 | if (audioCodec === 'aac') return 'mp4a.40.2' | |
113 | ||
114 | logger.warn('Cannot get audio codec of %s.', path, { audioStream }) | |
115 | ||
116 | return 'mp4a.40.2' // Fallback | |
117 | } | |
118 | ||
119 | async function getVideoFileResolution (path: string, existingProbe?: ffmpeg.FfprobeData) { | |
120 | const size = await getVideoStreamSize(path, existingProbe) | |
121 | ||
122 | return { | |
123 | videoFileResolution: Math.min(size.height, size.width), | |
124 | isPortraitMode: size.height > size.width | |
125 | } | |
126 | } | |
127 | ||
128 | async function getVideoFileFPS (path: string, existingProbe?: ffmpeg.FfprobeData) { | |
129 | const videoStream = await getVideoStreamFromFile(path, existingProbe) | |
130 | if (videoStream === null) return 0 | |
131 | ||
132 | for (const key of [ 'avg_frame_rate', 'r_frame_rate' ]) { | |
133 | const valuesText: string = videoStream[key] | |
134 | if (!valuesText) continue | |
135 | ||
136 | const [ frames, seconds ] = valuesText.split('/') | |
137 | if (!frames || !seconds) continue | |
138 | ||
139 | const result = parseInt(frames, 10) / parseInt(seconds, 10) | |
140 | if (result > 0) return Math.round(result) | |
141 | } | |
142 | ||
143 | return 0 | |
144 | } | |
145 | ||
146 | async function getMetadataFromFile (path: string, existingProbe?: ffmpeg.FfprobeData) { | |
147 | const metadata = existingProbe || await ffprobePromise(path) | |
148 | ||
149 | return new VideoFileMetadata(metadata) | |
150 | } | |
151 | ||
152 | async function getVideoFileBitrate (path: string, existingProbe?: ffmpeg.FfprobeData) { | |
153 | const metadata = await getMetadataFromFile(path, existingProbe) | |
154 | ||
155 | return metadata.format.bit_rate as number | |
156 | } | |
157 | ||
158 | async function getDurationFromVideoFile (path: string, existingProbe?: ffmpeg.FfprobeData) { | |
159 | const metadata = await getMetadataFromFile(path, existingProbe) | |
160 | ||
161 | return Math.floor(metadata.format.duration) | |
162 | } | |
163 | ||
164 | async function getVideoStreamFromFile (path: string, existingProbe?: ffmpeg.FfprobeData) { | |
165 | const metadata = await getMetadataFromFile(path, existingProbe) | |
166 | ||
167 | return metadata.streams.find(s => s.codec_type === 'video') || null | |
168 | } | |
169 | ||
170 | function computeResolutionsToTranscode (videoFileResolution: number, type: 'vod' | 'live') { | |
171 | const configResolutions = type === 'vod' | |
172 | ? CONFIG.TRANSCODING.RESOLUTIONS | |
173 | : CONFIG.LIVE.TRANSCODING.RESOLUTIONS | |
174 | ||
175 | const resolutionsEnabled: number[] = [] | |
176 | ||
177 | // Put in the order we want to proceed jobs | |
178 | const resolutions = [ | |
179 | VideoResolution.H_NOVIDEO, | |
180 | VideoResolution.H_480P, | |
181 | VideoResolution.H_360P, | |
182 | VideoResolution.H_720P, | |
183 | VideoResolution.H_240P, | |
184 | VideoResolution.H_1080P, | |
185 | VideoResolution.H_4K | |
186 | ] | |
187 | ||
188 | for (const resolution of resolutions) { | |
189 | if (configResolutions[resolution + 'p'] === true && videoFileResolution > resolution) { | |
190 | resolutionsEnabled.push(resolution) | |
191 | } | |
192 | } | |
193 | ||
194 | return resolutionsEnabled | |
195 | } | |
196 | ||
197 | async function canDoQuickTranscode (path: string): Promise<boolean> { | |
198 | const probe = await ffprobePromise(path) | |
199 | ||
5a547f69 C |
200 | return await canDoQuickVideoTranscode(path, probe) && |
201 | await canDoQuickAudioTranscode(path, probe) | |
202 | } | |
203 | ||
204 | async function canDoQuickVideoTranscode (path: string, probe?: ffmpeg.FfprobeData): Promise<boolean> { | |
daf6e480 | 205 | const videoStream = await getVideoStreamFromFile(path, probe) |
daf6e480 C |
206 | const fps = await getVideoFileFPS(path, probe) |
207 | const bitRate = await getVideoFileBitrate(path, probe) | |
208 | const resolution = await getVideoFileResolution(path, probe) | |
209 | ||
33ff70ba C |
210 | // If ffprobe did not manage to guess the bitrate |
211 | if (!bitRate) return false | |
212 | ||
daf6e480 C |
213 | // check video params |
214 | if (videoStream == null) return false | |
215 | if (videoStream['codec_name'] !== 'h264') return false | |
216 | if (videoStream['pix_fmt'] !== 'yuv420p') return false | |
217 | if (fps < VIDEO_TRANSCODING_FPS.MIN || fps > VIDEO_TRANSCODING_FPS.MAX) return false | |
218 | if (bitRate > getMaxBitrate(resolution.videoFileResolution, fps, VIDEO_TRANSCODING_FPS)) return false | |
219 | ||
5a547f69 C |
220 | return true |
221 | } | |
222 | ||
223 | async function canDoQuickAudioTranscode (path: string, probe?: ffmpeg.FfprobeData): Promise<boolean> { | |
224 | const parsedAudio = await getAudioStream(path, probe) | |
225 | ||
33ff70ba | 226 | if (!parsedAudio.audioStream) return true |
daf6e480 | 227 | |
33ff70ba | 228 | if (parsedAudio.audioStream['codec_name'] !== 'aac') return false |
daf6e480 | 229 | |
33ff70ba C |
230 | const audioBitrate = parsedAudio.bitrate |
231 | if (!audioBitrate) return false | |
232 | ||
233 | const maxAudioBitrate = getMaxAudioBitrate('aac', audioBitrate) | |
234 | if (maxAudioBitrate !== -1 && audioBitrate > maxAudioBitrate) return false | |
daf6e480 C |
235 | |
236 | return true | |
237 | } | |
238 | ||
239 | function getClosestFramerateStandard (fps: number, type: 'HD_STANDARD' | 'STANDARD'): number { | |
240 | return VIDEO_TRANSCODING_FPS[type].slice(0) | |
241 | .sort((a, b) => fps % a - fps % b)[0] | |
242 | } | |
243 | ||
244 | // --------------------------------------------------------------------------- | |
245 | ||
246 | export { | |
247 | getVideoStreamCodec, | |
248 | getAudioStreamCodec, | |
249 | getVideoStreamSize, | |
250 | getVideoFileResolution, | |
251 | getMetadataFromFile, | |
252 | getMaxAudioBitrate, | |
5a547f69 | 253 | getVideoStreamFromFile, |
daf6e480 C |
254 | getDurationFromVideoFile, |
255 | getAudioStream, | |
256 | getVideoFileFPS, | |
5a547f69 | 257 | ffprobePromise, |
daf6e480 C |
258 | getClosestFramerateStandard, |
259 | computeResolutionsToTranscode, | |
260 | getVideoFileBitrate, | |
5a547f69 C |
261 | canDoQuickTranscode, |
262 | canDoQuickVideoTranscode, | |
263 | canDoQuickAudioTranscode | |
daf6e480 | 264 | } |