edb4ffc7e0
* Set bitrate limits for transcoding (fixes #638) * added optimization script and test, changed stuff * fix test, improve docs * re-add optimize-old-videos script * added documentation * Don't optimize videos without valid UUID, or redundancy videos * move getUUIDFromFilename * fix tests? * update torrent and file size, some more fixes/improvements * use higher bitrate for high fps video, adjust bitrates * add test video * don't throw error if resolution is undefined * generate test fixture on the fly * use random noise video for bitrate test, add promise * shorten test video to avoid timeout * use existing function to optimize video * various fixes * increase test timeout * limit test fixture size, add link * test fixes * add await * more test fixes, add -b:v parameter * replace ffmpeg wiki link * fix ffmpeg params * fix unit test * add test fixture to .gitgnore * add video transcoding fps model * add missing file
63 lines
2.3 KiB
TypeScript
63 lines
2.3 KiB
TypeScript
import { VideoTranscodingFPS } from './video-transcoding-fps.model'
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export enum VideoResolution {
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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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}
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/**
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* Bitrate targets for different resolutions and frame rates, in bytes per second.
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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 (tested with random music video): https://www.h3xed.com/blogmedia/youtube-info.php
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*/
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export function getTargetBitrate (resolution: VideoResolution, fps: number,
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fpsTranscodingConstants: VideoTranscodingFPS) {
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switch (resolution) {
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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: 186 Kbps
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return 250 * 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: 480 Kbps
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return 500 * 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: 879 Kbps
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return 900 * 1000
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case VideoResolution.H_720P:
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if (fps === fpsTranscodingConstants.MAX) {
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// quality according to Google Live Encoder: 2,250 - 6,000 Kbps
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// Quality according to YouTube Video Info: 2634 Kbps
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return 2600 * 1000
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} else {
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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: 1752 Kbps
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return 1750 * 1000
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}
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case VideoResolution.H_1080P: // fallthrough
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default:
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if (fps === fpsTranscodingConstants.MAX) {
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// quality according to Google Live Encoder: 3000 - 6000 Kbps
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// Quality according to YouTube Video Info: 4387 Kbps
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return 4400 * 1000
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} else {
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// quality according to Google Live Encoder: 3000 - 6000 Kbps
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// Quality according to YouTube Video Info: 3277 Kbps
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return 3300 * 1000
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}
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}
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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,
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fpsTranscodingConstants: VideoTranscodingFPS) {
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return getTargetBitrate(resolution, fps, fpsTranscodingConstants) * 2
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}
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