Description:

The following bug was closed as fixed when it isn't:

http://bugs.archlinux.org/task/9656

FAAC does not work properly without this patch. For instance, FFmpeg will fall back on mp2 audio when encoding and muxing into a mp4 container. FAAC will allow to encode to aac without the patch, but will not encode into a mp4 container.

The check is simple, run faac --help. If one sees this, it's broken:

MP4 specific options:
MP4 support unavailable.

If one sees this, it's working properly:

MP4 specific options:
-w Wrap AAC data in MP4 container. (default for *.mp4 and *.m4a)
--artist X Set artist to X
--writer X Set writer to X
--title X Set title to X
--genre X Set genre to X
--album X Set album to X
--compilation Set compilation
--track X Set track to X (number/total)
--disc X Set disc to X (number/total)
--year X Set year to X
--cover-art X Read cover art from file X
--comment X Set comment to X