From cb36e441de47a710b3868f5072065d31eea2fe68 Mon Sep 17 00:00:00 2001
From: Carl Eugen Hoyos <cehoyos@ag.or.at>
Date: Thu, 16 Jan 2014 00:36:27 +0100
Subject: [PATCH] Never favour an audio stream with 0 channels in
 av_find_best_stream().

Fixes ticket #3311.
---
 libavformat/utils.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/utils.c b/libavformat/utils.c
index 3f4446deaf..c53051155d 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -3263,6 +3263,8 @@ int av_find_best_stream(AVFormatContext *ic,
             continue;
         if (st->disposition & (AV_DISPOSITION_HEARING_IMPAIRED|AV_DISPOSITION_VISUAL_IMPAIRED))
             continue;
+        if (type == AVMEDIA_TYPE_AUDIO && !avctx->channels)
+            continue;
         if (decoder_ret) {
             decoder = find_decoder(ic, st, st->codec->codec_id);
             if (!decoder) {