Partitioned macroblocks are always 8bit and not studio profile.

Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@outlook.com>
---
 libavcodec/mpeg4videodec.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c
index 116dc1507e..f1b542cebf 100644
--- a/libavcodec/mpeg4videodec.c
+++ b/libavcodec/mpeg4videodec.c
@@ -949,8 +949,7 @@ static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
             int dir = 0;
 
             mb_num++;
-            ff_update_block_index(s, s->avctx->bits_per_raw_sample,
-                                  s->avctx->lowres, s->chroma_x_shift);
+            ff_update_block_index(s, 8, s->avctx->lowres, 1);
             if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
                 s->first_slice_line = 0;
 
@@ -1141,8 +1140,7 @@ static int mpeg4_decode_partition_b(MpegEncContext *s, 
int mb_count)
             const int xy = s->mb_x + s->mb_y * s->mb_stride;
 
             mb_num++;
-            ff_update_block_index(s, s->avctx->bits_per_raw_sample,
-                                  s->avctx->lowres, s->chroma_x_shift);
+            ff_update_block_index(s, 8, s->avctx->lowres, 1);
             if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
                 s->first_slice_line = 0;
 
-- 
2.40.1

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