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Title: wonky results when converting mono audio with libfdkaac
Post by: Wally Walters on 2017-04-04 22:14:00

Whenever I try to convert a mono wave file into a 48-kbps AAC file -- using ffmpeg with libfdkaac enabled and HE-AAC v1 and the channel options set to "-ac 1" -- MediaInfo, foobar2000, Adobe Audition and others all report the output m4a file to be in stereo. Now, I know that the audio hasn't been magically been given channel separation that wasn't there before, so that isn't the problem, but I would like to know how to make the output properly show as being in mono. But how?

Title: Re: wonky results when converting mono audio with libfdkaac
Post by: lvqcl on 2017-04-04 23:08:15

I don't think you can do it.
https://hydrogenaud.io/index.php/topic,85135.msg903238.html#msg903238
https://hydrogenaud.io/index.php/topic,29959.msg258934.html#msg258934

Title: Re: wonky results when converting mono audio with libfdkaac
Post by: Wally Walters on 2017-04-04 23:30:50

Even if the players "upmix during decoding," shouldn't MediaInfo know better?

HydrogenAudio

Lossy Audio Compression => AAC => AAC - General => Topic started by: Wally Walters on 2017-04-04 22:14:00