avcodec/mpegvideo: Fix psnr calculation with slice threads

This fixes a race condition and use of the wrong field, which become shared
instead of per thread during some AVFrame changes.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 2 insertions, 0 deletions

diff --git a/libavcodec/mpegvideo.h b/libavcodec/mpegvideo.h
index 7b0fcafc5c..20dba38e9d 100644
--- a/libavcodec/mpegvideo.h
+++ b/libavcodec/mpegvideo.h
@@ -143,6 +143,8 @@ typedef struct Picture{
 
     int reference;
     int shared;
+
+    uint64_t error[AV_NUM_DATA_POINTERS];
 } Picture;
 
 /**