/**
* @param string $inFilename
* @param Audio $spec
* @param string $outFilename
*
* @return string
*/
public function convert($inFilename, Specification $spec, $outFilename)
{
$audio = $this->ffmpeg->open($inFilename);
$format = $this->createFormat($spec->getAudioFormat());
if ($spec->getAudioCodec()) {
$format->setAudioCodec($spec->getAudioCodec());
}
if ($spec->getAudioBitrate()) {
$format->setAudioKiloBitrate($spec->getAudioBitrate());
}
if ($spec->getAudioSamplerate()) {
$audio->addFilter(new AudioResamplableFilter($spec->getAudioSamplerate()));
}
if ($spec->getAudioChannels()) {
$format->setAudioChannels($spec->getAudioChannels());
}
$audio->save($format, $outFilename);
}
