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Set bitrate limits for transcoding (fixes #638) (#1135)

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* 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
This commit is contained in:
Felix Ableitner
2018-10-08 09:26:04 -05:00
committed by Chocobozzz
parent 2cae5f1307
commit edb4ffc7e0
16 changed files with 221 additions and 26 deletions
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55
shared/models/videos/video-resolution.enum.ts
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@@ -1,3 +1,5 @@
import { VideoTranscodingFPS } from './video-transcoding-fps.model'
export enum VideoResolution {
H_240P = 240,
H_360P = 360,
@@ -5,3 +7,56 @@ export enum VideoResolution {
H_720P = 720,
H_1080P = 1080
}
/**
* Bitrate targets for different resolutions and frame rates, in bytes per second.
* Sources for individual quality levels:
* Google Live Encoder: https://support.google.com/youtube/answer/2853702?hl=en
* YouTube Video Info (tested with random music video): https://www.h3xed.com/blogmedia/youtube-info.php
*/
export function getTargetBitrate (resolution: VideoResolution, fps: number,
fpsTranscodingConstants: VideoTranscodingFPS) {
switch (resolution) {
case VideoResolution.H_240P:
// quality according to Google Live Encoder: 300 - 700 Kbps
// Quality according to YouTube Video Info: 186 Kbps
return 250 * 1000
case VideoResolution.H_360P:
// quality according to Google Live Encoder: 400 - 1,000 Kbps
// Quality according to YouTube Video Info: 480 Kbps
return 500 * 1000
case VideoResolution.H_480P:
// quality according to Google Live Encoder: 500 - 2,000 Kbps
// Quality according to YouTube Video Info: 879 Kbps
return 900 * 1000
case VideoResolution.H_720P:
if (fps === fpsTranscodingConstants.MAX) {
// quality according to Google Live Encoder: 2,250 - 6,000 Kbps
// Quality according to YouTube Video Info: 2634 Kbps
return 2600 * 1000
} else {
// quality according to Google Live Encoder: 1,500 - 4,000 Kbps
// Quality according to YouTube Video Info: 1752 Kbps
return 1750 * 1000
}
case VideoResolution.H_1080P: // fallthrough
default:
if (fps === fpsTranscodingConstants.MAX) {
// quality according to Google Live Encoder: 3000 - 6000 Kbps
// Quality according to YouTube Video Info: 4387 Kbps
return 4400 * 1000
} else {
// quality according to Google Live Encoder: 3000 - 6000 Kbps
// Quality according to YouTube Video Info: 3277 Kbps
return 3300 * 1000
}
}
}
/**
* The maximum bitrate we expect to see on a transcoded video in bytes per second.
*/
export function getMaxBitrate (resolution: VideoResolution, fps: number,
fpsTranscodingConstants: VideoTranscodingFPS) {
return getTargetBitrate(resolution, fps, fpsTranscodingConstants) * 2
}