mkv.cpp: clean & fix seeking inside virtual_segment_t

modules/demux/mkv.cpp

@@ -1569,11 +1569,12 @@ bool matroska_segment_t::Select( mtime_t i_start_time )
     }
     
     sys.i_start_pts = i_start_time;
-    ep->Reset( &sys.demuxer );
-
     // reset the stream reading to the first cluster of the segment used
     es.I_O().setFilePointer( i_start_pos );
 
+    delete ep;
+    ep = new EbmlParser( &es, segment, &sys.demuxer );
+
     return true;
 }
 
@@ -1591,6 +1592,8 @@ void matroska_segment_t::UnSelect( )
         }
 #undef tk
     }
+    delete ep;
+    ep = NULL;
 }
 
 bool virtual_segment_t::Select( input_title_t & title )
@@ -3678,12 +3681,12 @@ void matroska_segment_t::Seek( mtime_t i_date, mtime_t i_time_offset )
     msg_Dbg( &sys.demuxer, "seek got "I64Fd" (%d%%)",
                 i_seek_time, (int)( 100 * i_seek_position / stream_Size( sys.demuxer.s ) ) );
 
+    es.I_O().setFilePointer( i_seek_position, seek_beginning );
+
     delete ep;
     ep = new EbmlParser( &es, segment, &sys.demuxer );
     cluster = NULL;
 
-    es.I_O().setFilePointer( i_seek_position, seek_beginning );
-
     sys.i_start_pts = i_date;
 
     es_out_Control( sys.demuxer.out, ES_OUT_RESET_PCR );