Avoid infinite loop when metadata computing fails.

src/Metadata/MetaDataWorker.cpp

@@ -114,9 +114,16 @@ MetaDataWorker::metaDataAvailable()
     //will trigger exception... so we shut it up.
     if ( m_media->getFileType() != Media::Audio )
     {
-        while ( m_mediaPlayer->hasVout() == false )
+        m_timer.restart();
+        while ( m_mediaPlayer->hasVout() == false &&
+                m_timer.elapsed() < 3000 )
         {
-            SleepMS( 1 ); //Ugly isn't it :)
+            SleepMS( 10 ); //Ugly isn't it :)
+        }
+        if ( m_mediaPlayer->hasVout() == false )
+        {
+            emit failed( m_media );
+            return ;
         }
 
         quint32     width, height;

src/Metadata/MetaDataWorker.h

@@ -24,10 +24,13 @@
 #ifndef METADATAWORKER_H
 #define METADATAWORKER_H
 
+#include "Media.h"
+
 #include <QList>
-#include <QTemporaryFile>
 #include <QLabel>
-#include "Media.h"
+#include <QTemporaryFile>
+#include <QTime>
+
 namespace LibVLCpp
 {
     class   MediaPlayer;
@@ -66,6 +69,7 @@ class MetaDataWorker : public QObject
         bool                        m_lengthHasChanged;
 
         unsigned char*              m_audioBuffer;
+        QTime                       m_timer;
 
     private slots:
         void    renderSnapshot();