use ac prediction in mpeg4 encoding (5% smaller intra-blocks/keyframes)

some minor optimizations
last non zero index cant be 64 bugfix

Originally committed as revision 331 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/mpegvideo.c

@@ -552,7 +552,7 @@ static inline void gmc1_motion(MpegEncContext *s,
     int dxy, offset, mx, my, src_x, src_y, height, linesize;
     int motion_x, motion_y;
 
-    if(s->real_sprite_warping_points>1) printf("Oops, thats bad, contact the developers\n");
+    if(s->real_sprite_warping_points>1) printf("more than 1 warp point isnt supported\n");
     motion_x= s->sprite_offset[0][0];
     motion_y= s->sprite_offset[0][1];
     src_x = s->mb_x * 16 + (motion_x >> (s->sprite_warping_accuracy+1));
@@ -1247,6 +1247,8 @@ static void encode_picture(MpegEncContext *s, int picture_number)
             case FMT_H263:
                 if (s->h263_msmpeg4)
                     msmpeg4_encode_mb(s, s->block, motion_x, motion_y);
+                else if(s->h263_pred)
+                    mpeg4_encode_mb(s, s->block, motion_x, motion_y);
                 else
                     h263_encode_mb(s, s->block, motion_x, motion_y);
                 break;

libavcodec/mpegvideo.h

@@ -145,7 +145,7 @@ typedef struct MpegEncContext {
     int avg_mb_var;        /* average MB variance for current frame */
     INT64 wanted_bits;
     INT64 total_bits;
-    
+ 
     /* H.263 specific */
     int gob_number;
     int gob_index;
@@ -313,6 +313,9 @@ static inline int get_rl_index(const RLTable *rl, int last, int run, int level)
 void h263_encode_mb(MpegEncContext *s, 
                     DCTELEM block[6][64],
                     int motion_x, int motion_y);
+void mpeg4_encode_mb(MpegEncContext *s, 
+                    DCTELEM block[6][64],
+                    int motion_x, int motion_y);
 void h263_encode_picture_header(MpegEncContext *s, int picture_number);
 int h263_encode_gob_header(MpegEncContext * s, int mb_line);
 void h263_dc_scale(MpegEncContext *s);