software to manually set an AR in an mkv files (LINUX)

[graysky]

Can someone recommend a piece of software that will allow me to set an AR in an mkv file (aac audio + x264 video)? I have been using Handbrake to do some encoding and it's getting the AR wrong.

Thanks!

[cacepi]

Can someone recommend a piece of software that will allow me to set an AR in an mkv file (aac audio + x264 video)?
mkvmerge, a gui frontend to the mkvtoolnix (http://www.bunkus.org/videotools/mkvtoolnix/) suite.

[graysky]

Cool, worked great thanks!