How to set filter of QFileSystemModel to display only audio and video files

I want to traverse the drives present in my system and search for audio/video files inside it. Basically I need to traverse my drives and display only .mp3 and .avi files. Then set the filter to these extensions and display the files in a treeview. I have 2 tree views, One to display System Directories and other to display audio/video files

Code:

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// Gets called when application starts
void DetailView::onCamStartup()
{
   m_SystemModel = new QFileSystemModel(this);
   m_SystemListViewModel = new QFileSystemModel(this);
   m_SystemModel->setRootPath(QDir::currentPath());
   ui->DriveView->setModel(m_SystemModel);
   ui->DriveListView->setModel(m_SystemListViewModel);
 
   // regard less how many columns you can do this using for:
   for(int nCount = 1; nCount < m_SystemModel->columnCount(); nCount++)
      ui->DriveView->hideColumn(nCount);
}
 
// Displays Files in Detail View on Clicking Drive
void DetailView::on_DriveView_clicked(const QModelIndex &index)
{
   QStringList sDriveFilters;
   QString sPath = m_SystemModel->fileInfo(index).absoluteFilePath();       
   m_SystemListViewModel->setRootPath(sPath);
   ui->DriveListView->setRootIndex(m_SystemListViewModel->index(sPath));
 
   m_SystemModel->setRootPath(QDir::currentPath());
   m_SystemModel->setFilter(QDir::NoDotAndDotDot | QDir::AllDirs );
   m_SystemListViewModel->setFilter( QDir::Files | QDir::NoDotAndDotDot );
 
   sDriveFilters << "*.aac" << "*.wmv" << "*.avi" << "*.mpeg" << "*.mov" << "*.3gp" << "*.flv" << "*.mp3" ;
   m_SystemListViewModel->setNameFilters(sDriveFilters);
   m_SystemListViewModel->setNameFilterDisables(false);
}

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You can notice in the above click event that I have set Filter to selected extensions. It displays the mp3 files which are in the drive but it doesnt parse the subfolders and fails to display the audio/video files present inside it.

Here is the image:
Attachment 8441
If you notice there are Folders inside SONGS folder where mp3 files are present but it doesnt display at all. Basically if i click New Volume E: it should display all mp3/.avi files in my right side treeview. Now i clicked SONGS folder, it displays one file inside the folder but it doesnt display the files inside the subfolders present. Where am i making mistake?