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From 5282db5929f25ca9566a47ad217794842b364afc Mon Sep 17 00:00:00 2001
From: Andriy Gelman <andriy.gelman@gmail.com>
Date: Wed, 12 Dec 2018 23:57:35 -0500
Subject: [PATCH] avcodec/mpeg: Initialize quarter_sample parameter from
previous thread.
Fixes #7410.
The value of sub-pixel precision for me/mc can change during an Intra frame. In multi-threaded decoding this change is not propagated to other frame threads causing decoding artifacts. This patch initializes the sub-pixel precision parameter from previous thread, which fixes the issue.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
libavcodec/mpegvideo.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index d4d3bea..dbb6ab9 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -538,6 +538,8 @@ int ff_mpeg_update_thread_context(AVCodecContext *dst,
s->avctx->width = s1->avctx->width;
s->avctx->height = s1->avctx->height;
+ s->quarter_sample = s1->quarter_sample;
+
s->coded_picture_number = s1->coded_picture_number;
s->picture_number = s1->picture_number;
--
1.9.1
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