Fix: B-adapt 1 should use B-frames 16

Chocobozzz · Jul 6, 2018 · d2c72ca · d2c72ca
1 parent c9e96ea
commit d2c72ca
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/server/helpers/ffmpeg-utils.ts b/server/helpers/ffmpeg-utils.ts
@@ -88,6 +88,13 @@ function transcode (options: TranscodeOptions) {
                     .videoCodec('libx264')
                     .outputOption('-threads ' + CONFIG.TRANSCODING.THREADS)
                     .outputOption('-movflags faststart')
+                    /** NOTE: 'b-adapt 1' aka 'b_strategy 1' is heuristic algorythm,
+                        convergence not depends on the number of allowed B-frames
+                        optimal B-frames option for it is 16 */
+                    .outputOption('-b_strategy 1')
+                    /** NOTE: Use B-frames <= 16 on '-b_strategy 2'
+                        reference: https://github.com/Chocobozzz/PeerTube/pull/774 */
+                    .outputOption('-bf 16')
                     // .outputOption('-crf 18')
 
     let fps = await getVideoFileFPS(options.inputPath)