From e39821a65e42722e81bf53bb44237f9bf8e4ce07 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Mon, 18 Feb 2013 20:51:54 +0100
Subject: [PATCH] nutenc: only write an index if there are syncpoints

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavformat/nutenc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/nutenc.c b/libavformat/nutenc.c
index 46711528a0..2d8d2652ee 100644
--- a/libavformat/nutenc.c
+++ b/libavformat/nutenc.c
@@ -990,7 +990,7 @@ static int nut_write_trailer(AVFormatContext *s)
         write_headers(s, bc);
 
     ret = avio_open_dyn_buf(&dyn_bc);
-    if (ret >= 0) {
+    if (ret >= 0 && nut->sp_count) {
         write_index(nut, dyn_bc);
         put_packet(nut, bc, dyn_bc, 1, INDEX_STARTCODE);
     }