From 67eeec8b955339120ff5d3c8286fdf0715e6270c Mon Sep 17 00:00:00 2001
From: Chocobozzz <me@florianbigard.com>
Date: Wed, 10 Nov 2021 11:04:00 +0100
Subject: Add minimum bitrate limit

---
 shared/core-utils/videos/bitrate.ts | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

(limited to 'shared')

diff --git a/shared/core-utils/videos/bitrate.ts b/shared/core-utils/videos/bitrate.ts
index 18c6e2f6c..c1891188f 100644
--- a/shared/core-utils/videos/bitrate.ts
+++ b/shared/core-utils/videos/bitrate.ts
@@ -4,6 +4,18 @@ type BitPerPixel = { [ id in VideoResolution ]: number }
 
 // https://bitmovin.com/video-bitrate-streaming-hls-dash/
 
+const minLimitBitPerPixel: BitPerPixel = {
+  [VideoResolution.H_NOVIDEO]: 0,
+  [VideoResolution.H_144P]: 0.02,
+  [VideoResolution.H_240P]: 0.02,
+  [VideoResolution.H_360P]: 0.02,
+  [VideoResolution.H_480P]: 0.02,
+  [VideoResolution.H_720P]: 0.02,
+  [VideoResolution.H_1080P]: 0.02,
+  [VideoResolution.H_1440P]: 0.02,
+  [VideoResolution.H_4K]: 0.02
+}
+
 const averageBitPerPixel: BitPerPixel = {
   [VideoResolution.H_NOVIDEO]: 0,
   [VideoResolution.H_144P]: 0.19,
@@ -50,11 +62,23 @@ function getMaxBitrate (options: {
   return targetBitrate
 }
 
+function getMinLimitBitrate (options: {
+  resolution: VideoResolution
+  ratio: number
+  fps: number
+}) {
+  const minLimitBitrate = calculateBitrate({ ...options, bitPerPixel: minLimitBitPerPixel })
+  if (!minLimitBitrate) return 10 * 1000
+
+  return minLimitBitrate
+}
+
 // ---------------------------------------------------------------------------
 
 export {
   getAverageBitrate,
-  getMaxBitrate
+  getMaxBitrate,
+  getMinLimitBitrate
 }
 
 // ---------------------------------------------------------------------------
-- 
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