demux: dash: force min update to be non-zero

modules/demux/adaptative/playlist/AbstractPlaylist.cpp

@@ -40,7 +40,7 @@ AbstractPlaylist::AbstractPlaylist (stream_t *stream_) :
     availabilityStartTime.Set( 0 );
     availabilityEndTime.Set( 0 );
     duration.Set( 0 );
-    minUpdatePeriod.Set( 0 );
+    minUpdatePeriod.Set( 2 );
     maxSegmentDuration.Set( 0 );
     minBufferTime.Set( 0 );
     timeShiftBufferDepth.Set( 0 );

modules/demux/dash/mpd/IsoffMainParser.cpp

@@ -101,7 +101,11 @@ void    IsoffMainParser::setMPDAttributes   ()
 
     it = attr.find("minimumUpdatePeriod");
     if(it != attr.end())
-        mpd->minUpdatePeriod.Set(IsoTime(it->second));
+    {
+        mtime_t minupdate = IsoTime(it->second);
+        if(minupdate > 0)
+            mpd->minUpdatePeriod.Set(minupdate);
+    }
 
     it = attr.find("maxSegmentDuration");
     if(it != attr.end())