From: Andreas Rheinhardt <andreas.rheinha...@outlook.com>
Said block will only be referenced by blocks from the same macroblock,
which will read the new AC values instead of the reset values
from this function.
Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@outlook.com>
---
libavcodec/mpegvideo.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index a27efa8b89..b481d1eef4 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -506,7 +506,9 @@ void ff_clean_intra_table_entries(MpegEncContext *s)
/* ac pred */
int16_t (*ac_val)[16] = s->ac_val[0];
av_assume(!((uintptr_t)ac_val & 0xF));
- memset(ac_val[xy ], 0, 2 * sizeof(*ac_val));
+ // Don't reset the upper-left luma block, as it will only ever be
+ // referenced by blocks from the same macroblock.
+ memset(ac_val[xy + 1], 0, sizeof(*ac_val));
memset(ac_val[xy + wrap], 0, 2 * sizeof(*ac_val));
/* ac pred */
memset(ac_val[uxy], 0, sizeof(*ac_val));
--
ffmpeg-codebot
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