demux: mkv: set es policy once

modules/demux/mkv/matroska_segment.cpp

@@ -1089,8 +1089,6 @@ bool matroska_segment_c::ESCreate()
 {
     /* add all es */
     msg_Dbg( &sys.demuxer, "found %d es", static_cast<int>( tracks.size() ) );
-    es_out_Control( sys.demuxer.out, ES_OUT_SET_ES_CAT_POLICY, VIDEO_ES,
-                    ES_OUT_ES_POLICY_EXCLUSIVE );
 
     for( tracks_map_t::iterator it = tracks.begin(); it != tracks.end(); ++it )
     {

modules/demux/mkv/mkv.cpp

@@ -114,6 +114,9 @@ static int Open( vlc_object_t * p_this )
     if ( vlc_stream_Control( p_demux->s, STREAM_CAN_FASTSEEK, &p_sys->b_fastseekable ) )
         p_sys->b_fastseekable = false;
 
+    es_out_Control( p_demux->out, ES_OUT_SET_ES_CAT_POLICY, VIDEO_ES,
+                    ES_OUT_ES_POLICY_EXCLUSIVE );
+
     p_stream = new matroska_stream_c( p_demux->s, false );
     if ( unlikely(p_stream == NULL) )
     {