mpegvideo: increase buffer sizes.

Fixes buffer overflow

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/mpegvideo.c

@@ -420,12 +420,12 @@ static int init_duplicate_context(MpegEncContext *s, MpegEncContext *base)
     // edge emu needs blocksize + filter length - 1
     // (= 17x17 for  halfpel / 21x21 for  h264)
     FF_ALLOCZ_OR_GOTO(s->avctx, s->edge_emu_buffer,
-                      (s->width + 64) * 2 * 21 * 2, fail);    // (width + edge + align)*interlaced*MBsize*tolerance
+                      (s->width + 95) * 2 * 21 * 4, fail);    // (width + edge + align)*interlaced*MBsize*tolerance
 
     // FIXME should be linesize instead of s->width * 2
     // but that is not known before get_buffer()
     FF_ALLOCZ_OR_GOTO(s->avctx, s->me.scratchpad,
-                      (s->width + 64) * 4 * 16 * 2 * sizeof(uint8_t), fail)
+                      (s->width + 95) * 4 * 16 * 2 * sizeof(uint8_t), fail)
     s->me.temp         = s->me.scratchpad;
     s->rd_scratchpad   = s->me.scratchpad;
     s->b_scratchpad    = s->me.scratchpad;