Otra manera...
Código php:
Ver original$cadena='Duration: 00:00:59.2, start: 0.000000, bitrate: 2480 kb/s';
list($cduration, $cstart, $cbitrate) = explode(",", $cadena); //obtener Duration
//obtener start
//obtener bitrate
echo "Duration = $dura_b | start = $star_b | bitrate = $bitr_b";
Saludos