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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>
This commit is contained in:
Andriy Gelman 2018-12-12 23:57:35 -05:00 committed by Michael Niedermayer
parent 78e7b70395
commit 5282db5929
1 changed files with 2 additions and 0 deletions
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libavcodec/mpegvideo.c
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@ -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;