From 2048126ea7a5df2aec55a0db24f642a05e80dca4 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Sun, 8 Feb 2015 02:03:39 +0100
Subject: [PATCH] avcodec/utils: Assert that dst->progress is clear before
 ff_thread_ref_frame()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavcodec/utils.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index 06b6a1f63b..c5e63000e1 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -3663,6 +3663,8 @@ int ff_thread_ref_frame(ThreadFrame *dst, ThreadFrame *src)
     if (ret < 0)
         return ret;
 
+    av_assert0(!dst->progress);
+
     if (src->progress &&
         !(dst->progress = av_buffer_ref(src->progress))) {
         ff_thread_release_buffer(dst->owner, dst);