Problem encoding

[2b3ez]

my config : Symfony 3 FFMpeg 3

In file Audio.php (src/FFMpeg/Media/Audio.php) line 79

$filters->add(new SimpleFilter(array('-acodec', $format->getAudioCodec())));

makes trouble about encoding

I replace this line by :

$filters->add(new SimpleFilter(array('-c:a:1', $format->getAudioCodec())));

and it works like a charm.

Do you know why ?

Thx !