@@ -555,7 +555,9 @@ int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)

     int rsize = 8;

     int c, d, e, off;

-    off= (url_ftell(pb) - s->data_offset) % asf->packet_size + 3;

+    off= 32768;

+    if (s->packet_size > 0)

+        off= (url_ftell(pb) - s->data_offset) % asf->packet_size + 3;

     c=d=e=-1;

     while(off-- > 0){

@@ -941,7 +943,8 @@ static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos,

         start_pos[i]= pos;

     }

-    pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;

+    if (s->packet_size > 0)

+        pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;

     *ppos= pos;

     url_fseek(s->pb, pos, SEEK_SET);