From 1d242f9816ac8e17a74d2f77bd903fa8076d267a Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Mon, 24 Nov 2014 16:52:19 +0100
Subject: [PATCH] avformat/mpegenc: assert that premux_packet is non null

Based on: 065923b0781b06a2604f69f4e2c2407b7750a854
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavformat/mpegenc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavformat/mpegenc.c b/libavformat/mpegenc.c
index d3af9e1ea7..b1515064e8 100644
--- a/libavformat/mpegenc.c
+++ b/libavformat/mpegenc.c
@@ -1080,8 +1080,10 @@ retry:
         es_size              -= stream->premux_packet->unwritten_size;
         stream->premux_packet = stream->premux_packet->next;
     }
-    if (es_size)
+    if (es_size) {
+        av_assert0(stream->premux_packet);
         stream->premux_packet->unwritten_size -= es_size;
+    }
 
     if (remove_decoded_packets(ctx, s->last_scr) < 0)
         return -1;