* Google Live Encoder: https://support.google.com/youtube/answer/2853702?hl=en
* YouTube Video Info: youtube-dl --list-formats, with sample videos
*/
-function getBaseBitrate (resolution: VideoResolution) {
- switch (resolution) {
- case VideoResolution.H_NOVIDEO:
- // audio-only
- return 64 * 1000
-
- case VideoResolution.H_240P:
- // quality according to Google Live Encoder: 300 - 700 Kbps
- // Quality according to YouTube Video Info: 285 Kbps
- return 320 * 1000
+function getBaseBitrate (resolution: number) {
+ if (resolution === VideoResolution.H_NOVIDEO) {
+ // audio-only
+ return 64 * 1000
+ }
- case VideoResolution.H_360P:
- // quality according to Google Live Encoder: 400 - 1,000 Kbps
- // Quality according to YouTube Video Info: 700 Kbps
- return 780 * 1000
+ if (resolution <= VideoResolution.H_240P) {
+ // quality according to Google Live Encoder: 300 - 700 Kbps
+ // Quality according to YouTube Video Info: 285 Kbps
+ return 320 * 1000
+ }
- case VideoResolution.H_480P:
- // quality according to Google Live Encoder: 500 - 2,000 Kbps
- // Quality according to YouTube Video Info: 1300 Kbps
- return 1500 * 1000
+ if (resolution <= VideoResolution.H_360P) {
+ // quality according to Google Live Encoder: 400 - 1,000 Kbps
+ // Quality according to YouTube Video Info: 700 Kbps
+ return 780 * 1000
+ }
- case VideoResolution.H_720P:
- // quality according to Google Live Encoder: 1,500 - 4,000 Kbps
- // Quality according to YouTube Video Info: 2680 Kbps
- return 2800 * 1000
+ if (resolution <= VideoResolution.H_480P) {
+ // quality according to Google Live Encoder: 500 - 2,000 Kbps
+ // Quality according to YouTube Video Info: 1300 Kbps
+ return 1500 * 1000
+ }
- case VideoResolution.H_1080P:
- // quality according to Google Live Encoder: 3000 - 6000 Kbps
- // Quality according to YouTube Video Info: 5081 Kbps
- return 5200 * 1000
+ if (resolution <= VideoResolution.H_720P) {
+ // quality according to Google Live Encoder: 1,500 - 4,000 Kbps
+ // Quality according to YouTube Video Info: 2680 Kbps
+ return 2800 * 1000
+ }
- case VideoResolution.H_4K: // fallthrough
- default:
- // quality according to Google Live Encoder: 13000 - 34000 Kbps
- return 22000 * 1000
+ if (resolution <= VideoResolution.H_1080P) {
+ // quality according to Google Live Encoder: 3000 - 6000 Kbps
+ // Quality according to YouTube Video Info: 5081 Kbps
+ return 5200 * 1000
}
+
+ // 4K
+ // quality according to Google Live Encoder: 13000 - 34000 Kbps
+ return 22000 * 1000
}
/**
* getBaseBitrate() * 1.4. All other values are calculated linearly
* between these two points.
*/
-export function getTargetBitrate (resolution: VideoResolution, fps: number, fpsTranscodingConstants: VideoTranscodingFPS) {
+export function getTargetBitrate (resolution: number, fps: number, fpsTranscodingConstants: VideoTranscodingFPS) {
const baseBitrate = getBaseBitrate(resolution)
// The maximum bitrate, used when fps === VideoTranscodingFPS.MAX
// Based on numbers from Youtube, 60 fps bitrate divided by 30 fps bitrate: