afconvert to convert ac3 to aac

I'm trying to use afconvert to convert an ac3 file in to an aac file. The ac3 file is a stream extracted from a mkv using mkvextract. And I'm getting no where here is how far I've got. Code:

Hi I can't help you with afconvert, but here is a small script to convert ac3 too aac5.1 with faac and mplayer Code:

I think you might have a problem with the FIFO creation, which should be done by the "mkfifo audiodump.pcm" part of the script ... the problem resides in your OSX kernel version, which apparently wasn't compiled with FIFO support (I just google and found man page). Try and execute the following commands: Code:

Hmm strange anyway ... seems like the two commands weren't executed sequentially when run from inside the script, causing mplayer trying to open the FIFO before it was actually created :confused: Anyway, I'm glad you got it working! ;)