mpeg12enc: increase declared size of block function argument

CC: libav-stable@libav.org
Bug-Id: CID 1047236
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

libavcodec/mpeg12enc.c

@@ -658,7 +658,7 @@ next_coef:
 }
 
 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
-                                                      int16_t block[6][64],
+                                                      int16_t block[8][64],
                                                       int motion_x, int motion_y,
                                                       int mb_block_count)
 {
@@ -935,7 +935,7 @@ static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
     }
 }
 
-void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[6][64],
+void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[8][64],
                         int motion_x, int motion_y)
 {
     if (s->chroma_format == CHROMA_420)

libavcodec/mpegvideo.h

@@ -837,7 +837,7 @@ extern const uint8_t * const ff_mpeg2_dc_scale_table[4];
 
 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number);
 void ff_mpeg1_encode_mb(MpegEncContext *s,
-                        int16_t block[6][64],
+                        int16_t block[8][64],
                         int motion_x, int motion_y);
 void ff_mpeg1_encode_init(MpegEncContext *s);
 void ff_mpeg1_encode_slice_header(MpegEncContext *s);