Fix transcoding of quad audio channels

2 files changed, 6 insertions, 3 deletions

diff --git a/server/helpers/ffmpeg/ffprobe-utils.ts b/server/helpers/ffmpeg/ffprobe-utils.ts
index c45f9ec99..9746c2046 100644
--- a/server/helpers/ffmpeg/ffprobe-utils.ts
+++ b/server/helpers/ffmpeg/ffprobe-utils.ts
@@ -163,7 +163,7 @@ async function canDoQuickAudioTranscode (path: string, probe?: FfprobeData): Pro
 
   const channelLayout = parsedAudio.audioStream['channel_layout']
   // Causes playback issues with Chrome
-  if (!channelLayout || channelLayout === 'unknown') return false
+  if (!channelLayout || channelLayout === 'unknown' || channelLayout === 'quad') return false
 
   return true
 }
diff --git a/server/lib/transcoding/default-transcoding-profiles.ts b/server/lib/transcoding/default-transcoding-profiles.ts
index 8f01f57a5..f47718819 100644
--- a/server/lib/transcoding/default-transcoding-profiles.ts
+++ b/server/lib/transcoding/default-transcoding-profiles.ts
@@ -76,11 +76,14 @@ const defaultAACOptionsBuilder: EncoderOptionsBuilder = async ({ input, streamNu
 
   logger.debug('Calculating audio bitrate of %s by AAC encoder.', input, { bitrate: parsedAudio.bitrate, audioCodecName })
 
+  // Force stereo as it causes some issues with HLS playback in Chrome
+  const base = [ '-channel_layout', 'stereo' ]
+
   if (bitrate !== -1) {
-    return { outputOptions: [ buildStreamSuffix('-b:a', streamNum), bitrate + 'k' ] }
+    return { outputOptions: base.concat([ buildStreamSuffix('-b:a', streamNum), bitrate + 'k' ]) }
   }
 
-  return { outputOptions: [ ] }
+  return { outputOptions: base }
 }
 
 const defaultLibFDKAACVODOptionsBuilder: EncoderOptionsBuilder = ({ streamNum }) => {