From ce0bc09ee2580d49fec90a6eb0de2ba1b580c854 Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Sun, 29 Mar 2015 15:20:30 +0200
Subject: [PATCH] hevc: do not change the VPS if its contents are the same

This is the same as is done for SPS.
---
 libavcodec/hevc_ps.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/libavcodec/hevc_ps.c b/libavcodec/hevc_ps.c
index db658bed2d..631dca85f2 100644
--- a/libavcodec/hevc_ps.c
+++ b/libavcodec/hevc_ps.c
@@ -407,8 +407,14 @@ int ff_hevc_decode_nal_vps(HEVCContext *s)
     }
     get_bits1(gb); /* vps_extension_flag */
 
-    av_buffer_unref(&s->vps_list[vps_id]);
-    s->vps_list[vps_id] = vps_buf;
+    if (s->vps_list[vps_id] &&
+        !memcmp(s->vps_list[vps_id]->data, vps_buf->data, vps_buf->size)) {
+        av_buffer_unref(&vps_buf);
+    } else {
+        av_buffer_unref(&s->vps_list[vps_id]);
+        s->vps_list[vps_id] = vps_buf;
+    }
+
     return 0;
 
 err: