From e4192ff0dbc6a825a61e48d93418f3eb200b931f Mon Sep 17 00:00:00 2001
From: John Stebbins <jstebbins.hb@gmail.com>
Date: Sun, 11 Sep 2016 11:32:29 -0700
Subject: [PATCH] opus: fix 5.1 encoding

---
 libhb/encavcodecaudio.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libhb/encavcodecaudio.c b/libhb/encavcodecaudio.c
index 73d44a25c..b66a86ffa 100644
--- a/libhb/encavcodecaudio.c
+++ b/libhb/encavcodecaudio.c
@@ -127,6 +127,10 @@ static int encavcodecaInit(hb_work_object_t *w, hb_job_t *job)
 
         case HB_ACODEC_OPUS:
             codec_name = "libopus";
+            // Libav's libfdk-aac wrapper expects back channels for 5.1
+            // audio, and will error out unless we translate the layout
+            if (channel_layout == AV_CH_LAYOUT_5POINT1)
+                channel_layout  = AV_CH_LAYOUT_5POINT1_BACK;
             break;
 
         default:
-- 
2.40.0