@@ -209,6 +209,7 @@ typedef struct DVBSubRegion {

     uint8_t *pbuf;

     int buf_size;

+    int dirty;

     DVBSubObjectDisplay *display_list;

@@ -781,6 +782,7 @@ static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDis

         return;

     pbuf = region->pbuf;

+    region->dirty = 1;

     x_pos = display->x_pos;

     y_pos = display->y_pos;

@@ -1044,6 +1046,7 @@ static void dvbsub_parse_region_segment(AVCodecContext *avctx,

         region->pbuf = av_malloc(region->buf_size);

         fill = 1;

+        region->dirty = 0;

     }

     region->depth = 1 << (((*buf++) >> 2) & 7);

@@ -1356,6 +1359,10 @@ static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,

         if (!region)

             continue;

+        if (!region->dirty)

+            continue;

+

+        rect = sub->rects[i];

         rect->x = display->x_pos + offset_x;

         rect->y = display->y_pos + offset_y;

         rect->w = region->width;