else if ( TagLib::MP4::File *file = dynamic_cast<TagLib::MP4::File *>( fileref.file() ) )
        {
            m_type = mp4;
            TagLib::MP4::Tag *mp4tag = dynamic_cast<TagLib::MP4::Tag *>( file->tag() );
            if( mp4tag )
            {
                setComposer( TStringToQString( mp4tag->composer() ) );
                disc = QString::number( mp4tag->disk() );
                compilation = QString::number( mp4tag->compilation() );
                if ( images && mp4tag->cover().size() ) {
                    images->push_back( EmbeddedImage( mp4tag->cover(), "" ) );
                }
            }
        }

        m_uniqueId = QString::null;
#        if ( atf )
#            setUniqueId( fileref );

        if ( !disc.isEmpty() )
        {
            int i = disc.find ('/');
            if ( i != -1 )
                // disc.right( i ).toInt() is total number of discs, we don't use this at the moment
                setDiscNumber( disc.left( i ).toInt() );
            else
                setDiscNumber( disc.toInt() );
        }