<?php


$resposta = 'Stream #0:0(jpn): Video: h264 ...
Stream #0:1(jpn): Audio: mp3 ...
Stream #0:2(por): Subtitle ...';

if (preg_match_all('/Stream\s[#](\d+:\d+)\((\w+)\):\s(\w+)[ :]+(\w+|)/i', $resposta, $output) == 0) {
    echo 'Nenhuma informação encontrada';
} else {
    print_r($output);
}