h264: use long reading for first_mb_in_slice

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/h264.c

@@ -2632,7 +2632,7 @@ static int decode_slice_header(H264Context *h, H264Context *h0){
         s->me.qpel_avg= s->dsp.avg_h264_qpel_pixels_tab;
     }
 
-    first_mb_in_slice= get_ue_golomb(&s->gb);
+    first_mb_in_slice= get_ue_golomb_long(&s->gb);
 
     if(first_mb_in_slice == 0){ //FIXME better field boundary detection
         if(h0->current_slice && FIELD_PICTURE){

libavcodec/h264_parser.c

@@ -185,7 +185,7 @@ static inline int parse_nal_units(AVCodecParserContext *s,
             s->key_frame = 1;
             /* fall through */
         case NAL_SLICE:
-            get_ue_golomb(&h->s.gb);  // skip first_mb_in_slice
+            get_ue_golomb_long(&h->s.gb);  // skip first_mb_in_slice
             slice_type = get_ue_golomb_31(&h->s.gb);
             s->pict_type = golomb_to_pict_type[slice_type % 5];
             if (h->sei_recovery_frame_cnt >= 0) {