h264: Reset last_pocs in case of reference or frame number inconsistencies

This prevents faulty increasing of has_b_frames
Should fix Ticket 2062

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

libavcodec/h264.c

@@ -2984,6 +2984,9 @@ static int decode_slice_header(H264Context *h, H264Context *h0)
             Picture *prev = h->short_ref_count ? h->short_ref[0] : NULL;
             av_log(h->s.avctx, AV_LOG_DEBUG, "Frame num gap %d %d\n",
                    h->frame_num, h->prev_frame_num);
+            if (!h->sps.gaps_in_frame_num_allowed_flag)
+                for(i=0; i<FF_ARRAY_ELEMS(h->last_pocs); i++)
+                    h->last_pocs[i] = INT_MIN;
             if (ff_h264_frame_start(h) < 0)
                 return -1;
             h->prev_frame_num++;

libavcodec/h264_refs.c

@@ -287,7 +287,10 @@ int ff_h264_decode_ref_pic_list_reordering(H264Context *h){
     for(list=0; list<h->list_count; list++){
         for(index= 0; index < h->ref_count[list]; index++){
             if (!h->ref_list[list][index].f.data[0]) {
+                int i;
                 av_log(h->s.avctx, AV_LOG_ERROR, "Missing reference picture, default is %d\n", h->default_ref_list[list][0].poc);
+                for (i=0; i<FF_ARRAY_ELEMS(h->last_pocs); i++)
+                    h->last_pocs[i] = INT_MIN;
                 if (h->default_ref_list[list][0].f.data[0])
                     h->ref_list[list][index]= h->default_ref_list[list][0];
                 else