Improved a bit still frame support.

modules/access/dvdnav.c

@@ -612,6 +612,7 @@ static int Demux( demux_t *p_demux )
     switch( i_event )
     {
     case DVDNAV_BLOCK_OK:   /* mpeg block */
+        p_sys->p_ev->b_still = false;
         DemuxBlock( p_demux, packet, i_len );
         break;
 
@@ -620,6 +621,10 @@ static int Demux( demux_t *p_demux )
         break;
 
     case DVDNAV_STILL_FRAME:
+    {
+        dvdnav_still_event_t *event = (dvdnav_still_event_t*)packet;
+        vlc_mutex_lock( &p_sys->p_ev->lock );
+        if( !p_sys->p_ev->b_still )
         {
             /* We send a dummy mpeg2 end of sequence to force still frame display */
             static const uint8_t buffer[] = {
@@ -629,11 +634,6 @@ static int Demux( demux_t *p_demux )
             };
             DemuxBlock( p_demux, buffer, sizeof(buffer) );
 
-        /* */
-        dvdnav_still_event_t *event = (dvdnav_still_event_t*)packet;
-        vlc_mutex_lock( &p_sys->p_ev->lock );
-        if( !p_sys->p_ev->b_still )
-        {
             msg_Dbg( p_demux, "DVDNAV_STILL_FRAME" );
             msg_Dbg( p_demux, "     - length=0x%x", event->length );
             p_sys->p_ev->b_still = true;