From 602a81a2137afcb5ca12341329199fbea2f08bd8 Mon Sep 17 00:00:00 2001
From: Anton Latukha <anton.latukha@gmail.com>
Date: Tue, 10 Jul 2018 01:27:59 +0300
Subject: (ffmpeg) B-adapt 1 and B-frames 16 (#774)

---
 server/helpers/ffmpeg-utils.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/server/helpers/ffmpeg-utils.ts b/server/helpers/ffmpeg-utils.ts
index 4086335d7..f0623c88b 100644
--- a/server/helpers/ffmpeg-utils.ts
+++ b/server/helpers/ffmpeg-utils.ts
@@ -88,6 +88,8 @@ function transcode (options: TranscodeOptions) {
                     .videoCodec('libx264')
                     .outputOption('-threads ' + CONFIG.TRANSCODING.THREADS)
                     .outputOption('-movflags faststart')
+                    .outputOption('-b_strategy 1') // NOTE: b-strategy 1 - heuristic algorythm, 16 is optimal B-frames for it
+                    .outputOption('-bf 16') // NOTE: Why 16: https://github.com/Chocobozzz/PeerTube/pull/774. b-strategy 2 -> B-frames<16
                     // .outputOption('-crf 18')
 
     let fps = await getVideoFileFPS(options.inputPath)
-- 
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