Don't set a bitrate on unknown audio input

server/helpers/ffmpeg-utils.ts

@@ -236,7 +236,7 @@ namespace audio {
   }
 
   export namespace bitrate {
-    export const baseKbitrate = 384
+    const baseKbitrate = 384
 
     const toBits = (kbits: number): number => { return kbits * 8000 }
 
@@ -274,7 +274,6 @@ namespace audio {
  * See https://trac.ffmpeg.org/wiki/Encode/AAC#fdk_vbr
  */
 async function standard (_ffmpeg) {
-  let _bitrate = audio.bitrate.baseKbitrate
   let localFfmpeg = _ffmpeg
     .format('mp4')
     .videoCodec('libx264')
@@ -289,15 +288,6 @@ async function standard (_ffmpeg) {
     return localFfmpeg.noAudio()
   }
 
-  // we try to reduce the ceiling bitrate by making rough correspondances of bitrates
-  // of course this is far from perfect, but it might save some space in the end
-  if (audio.bitrate[_audio.audioStream['codec_name']]) {
-    _bitrate = audio.bitrate[_audio.audioStream['codec_name']](_audio.audioStream['bit_rate'])
-    if (_bitrate === -1) {
-      return localFfmpeg.audioCodec('copy')
-    }
-  }
-
   // we favor VBR, if a good AAC encoder is available
   if ((await checkFFmpegEncoders()).get('libfdk_aac')) {
     return localFfmpeg
@@ -305,5 +295,17 @@ async function standard (_ffmpeg) {
       .audioQuality(5)
   }
 
-  return localFfmpeg.audioBitrate(_bitrate)
+  // we try to reduce the ceiling bitrate by making rough correspondances of bitrates
+  // of course this is far from perfect, but it might save some space in the end
+  const audioCodecName = _audio.audioStream['codec_name']
+  let bitrate: number
+  if (audio.bitrate[audioCodecName]) {
+    bitrate = audio.bitrate[audioCodecName](_audio.audioStream['bit_rate'])
+
+    if (bitrate === -1) return localFfmpeg.audioCodec('copy')
+  }
+
+  if (bitrate !== undefined) return localFfmpeg.audioBitrate(bitrate)
+
+  return localFfmpeg
 }

server/tests/api/videos/multiple-servers.ts

@@ -209,19 +209,19 @@ describe('Test multiple servers', function () {
           files: [
             {
               resolution: 240,
-              size: 342000
+              size: 187000
             },
             {
               resolution: 360,
-              size: 433000
+              size: 278000
             },
             {
               resolution: 480,
-              size: 538000
+              size: 383000
             },
             {
               resolution: 720,
-              size: 861000
+              size: 706000
             }
           ],
           thumbnailfile: 'thumbnail',