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

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-adapt 1' aka '-b_strategy 1' uses algorythm with logarithmic convergence to the number of B-frames, so usage of B-frames less then 16 only restricts the bit/quality of compression. Creator of '-b-adapt 2': https://forum.doom9.org/showthread.php?t=139827 */
+                    .outputOption('-bf 16') //** NOTE: Use B-frames <= 16 on '-b_strategy 2'
                     // .outputOption('-crf 18')
 
     let fps = await getVideoFileFPS(options.inputPath)