77e0851758
Before applying this commit, check you don't have duplicates local actors in your database: select "preferredUsername" from actor where "serverId" is null group by "preferredUsername" having count(*) > 0 If you have some results, it seems you have duplicate channels/accounts. For every entry, you'll have to change the preferredUsername of the entry you want (so they are unique). The updated actors could have some federations issues. Sorry.
90 lines
3.2 KiB
TypeScript
90 lines
3.2 KiB
TypeScript
import { VideoTranscodingFPS } from './video-transcoding-fps.model'
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export enum VideoResolution {
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H_NOVIDEO = 0,
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H_240P = 240,
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H_360P = 360,
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H_480P = 480,
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H_720P = 720,
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H_1080P = 1080,
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H_4K = 2160
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}
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/**
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* Bitrate targets for different resolutions, at VideoTranscodingFPS.AVERAGE.
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*
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* Sources for individual quality levels:
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* Google Live Encoder: https://support.google.com/youtube/answer/2853702?hl=en
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* YouTube Video Info: youtube-dl --list-formats, with sample videos
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*/
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function getBaseBitrate (resolution: VideoResolution) {
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switch (resolution) {
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case VideoResolution.H_NOVIDEO:
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// audio-only
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return 64 * 1000
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case VideoResolution.H_240P:
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// quality according to Google Live Encoder: 300 - 700 Kbps
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// Quality according to YouTube Video Info: 285 Kbps
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return 320 * 1000
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case VideoResolution.H_360P:
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// quality according to Google Live Encoder: 400 - 1,000 Kbps
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// Quality according to YouTube Video Info: 700 Kbps
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return 780 * 1000
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case VideoResolution.H_480P:
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// quality according to Google Live Encoder: 500 - 2,000 Kbps
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// Quality according to YouTube Video Info: 1300 Kbps
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return 1500 * 1000
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case VideoResolution.H_720P:
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// quality according to Google Live Encoder: 1,500 - 4,000 Kbps
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// Quality according to YouTube Video Info: 2680 Kbps
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return 2800 * 1000
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case VideoResolution.H_1080P:
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// quality according to Google Live Encoder: 3000 - 6000 Kbps
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// Quality according to YouTube Video Info: 5081 Kbps
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return 5800 * 1000
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case VideoResolution.H_4K: // fallthrough
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default:
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// quality according to Google Live Encoder: 13000 - 34000 Kbps
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return 15000 * 1000
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}
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}
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/**
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* Calculate the target bitrate based on video resolution and FPS.
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*
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* The calculation is based on two values:
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* Bitrate at VideoTranscodingFPS.AVERAGE is always the same as
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* getBaseBitrate(). Bitrate at VideoTranscodingFPS.MAX is always
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* getBaseBitrate() * 1.4. All other values are calculated linearly
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* between these two points.
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*/
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export function getTargetBitrate (resolution: VideoResolution, fps: number, fpsTranscodingConstants: VideoTranscodingFPS) {
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const baseBitrate = getBaseBitrate(resolution)
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// The maximum bitrate, used when fps === VideoTranscodingFPS.MAX
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// Based on numbers from Youtube, 60 fps bitrate divided by 30 fps bitrate:
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// 720p: 2600 / 1750 = 1.49
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// 1080p: 4400 / 3300 = 1.33
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const maxBitrate = baseBitrate * 1.4
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const maxBitrateDifference = maxBitrate - baseBitrate
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const maxFpsDifference = fpsTranscodingConstants.MAX - fpsTranscodingConstants.AVERAGE
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// For 1080p video with default settings, this results in the following formula:
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// 3300 + (x - 30) * (1320/30)
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// Example outputs:
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// 1080p10: 2420 kbps, 1080p30: 3300 kbps, 1080p60: 4620 kbps
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// 720p10: 1283 kbps, 720p30: 1750 kbps, 720p60: 2450 kbps
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return baseBitrate + (fps - fpsTranscodingConstants.AVERAGE) * (maxBitrateDifference / maxFpsDifference)
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}
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/**
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* The maximum bitrate we expect to see on a transcoded video in bytes per second.
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*/
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export function getMaxBitrate (resolution: VideoResolution, fps: number, fpsTranscodingConstants: VideoTranscodingFPS) {
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return getTargetBitrate(resolution, fps, fpsTranscodingConstants) * 2
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}
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