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-rw-r--r--shared/models/videos/video-resolution.enum.ts55
1 files changed, 55 insertions, 0 deletions
diff --git a/shared/models/videos/video-resolution.enum.ts b/shared/models/videos/video-resolution.enum.ts
index 100fc0e6e..3c52bbf98 100644
--- a/shared/models/videos/video-resolution.enum.ts
+++ b/shared/models/videos/video-resolution.enum.ts
@@ -1,3 +1,5 @@
1import { VideoTranscodingFPS } from './video-transcoding-fps.model'
2
1export enum VideoResolution { 3export enum VideoResolution {
2 H_240P = 240, 4 H_240P = 240,
3 H_360P = 360, 5 H_360P = 360,
@@ -5,3 +7,56 @@ export enum VideoResolution {
5 H_720P = 720, 7 H_720P = 720,
6 H_1080P = 1080 8 H_1080P = 1080
7} 9}
10
11/**
12 * Bitrate targets for different resolutions and frame rates, in bytes per second.
13 * Sources for individual quality levels:
14 * Google Live Encoder: https://support.google.com/youtube/answer/2853702?hl=en
15 * YouTube Video Info (tested with random music video): https://www.h3xed.com/blogmedia/youtube-info.php
16 */
17export function getTargetBitrate (resolution: VideoResolution, fps: number,
18 fpsTranscodingConstants: VideoTranscodingFPS) {
19 switch (resolution) {
20 case VideoResolution.H_240P:
21 // quality according to Google Live Encoder: 300 - 700 Kbps
22 // Quality according to YouTube Video Info: 186 Kbps
23 return 250 * 1000
24 case VideoResolution.H_360P:
25 // quality according to Google Live Encoder: 400 - 1,000 Kbps
26 // Quality according to YouTube Video Info: 480 Kbps
27 return 500 * 1000
28 case VideoResolution.H_480P:
29 // quality according to Google Live Encoder: 500 - 2,000 Kbps
30 // Quality according to YouTube Video Info: 879 Kbps
31 return 900 * 1000
32 case VideoResolution.H_720P:
33 if (fps === fpsTranscodingConstants.MAX) {
34 // quality according to Google Live Encoder: 2,250 - 6,000 Kbps
35 // Quality according to YouTube Video Info: 2634 Kbps
36 return 2600 * 1000
37 } else {
38 // quality according to Google Live Encoder: 1,500 - 4,000 Kbps
39 // Quality according to YouTube Video Info: 1752 Kbps
40 return 1750 * 1000
41 }
42 case VideoResolution.H_1080P: // fallthrough
43 default:
44 if (fps === fpsTranscodingConstants.MAX) {
45 // quality according to Google Live Encoder: 3000 - 6000 Kbps
46 // Quality according to YouTube Video Info: 4387 Kbps
47 return 4400 * 1000
48 } else {
49 // quality according to Google Live Encoder: 3000 - 6000 Kbps
50 // Quality according to YouTube Video Info: 3277 Kbps
51 return 3300 * 1000
52 }
53 }
54}
55
56/**
57 * The maximum bitrate we expect to see on a transcoded video in bytes per second.
58 */
59export function getMaxBitrate (resolution: VideoResolution, fps: number,
60 fpsTranscodingConstants: VideoTranscodingFPS) {
61 return getTargetBitrate(resolution, fps, fpsTranscodingConstants) * 2
62}