From fb5518cfb76af414a46366f74bffb5874bf3bfc4 Mon Sep 17 00:00:00 2001
From: Carl Eugen Hoyos <cehoyos@ag.or.at>
Date: Fri, 13 Dec 2013 11:57:39 +0100
Subject: [PATCH] Force one stream in caf muxer.

Based on eeb975f5
---
 libavformat/cafenc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavformat/cafenc.c b/libavformat/cafenc.c
index cd3a0be907..ae36b85cb1 100644
--- a/libavformat/cafenc.c
+++ b/libavformat/cafenc.c
@@ -108,6 +108,11 @@ static int caf_write_header(AVFormatContext *s)
     unsigned int codec_tag = ff_codec_get_tag(ff_codec_caf_tags, enc->codec_id);
     int64_t chunk_size = 0;
 
+    if (s->nb_streams != 1) {
+        av_log(s, AV_LOG_ERROR, "CAF files have exactly one stream\n");
+        return AVERROR(EINVAL);
+    }
+
     switch (enc->codec_id) {
     case AV_CODEC_ID_AAC:
     case AV_CODEC_ID_AC3: