========================= update 9/29/2011 ===================
I have recently discovered that while the old LAME Quicktime component (link below) installs fine and runs well, it only produces correct MP3 files if you select the constant bit rate (CBR) option. The developer did not implement variable (or average) bit rate correctly. Average bit rate (ABR) and Variable bit rate (VBR) MP3 files are generally of higher quality than ones created with CBR. I have implemented a version of the LAME Quicktime Encoder that correctly handles ABR (Average bit rate encoding) by calling the appropriate LAME functions.
Instructions for using MP3 output in Metro:
For PC: Metro will export audio directly to MP3 files but only if the LAME encoder library is already installed on your computer. The LAME library is avaiilable online in the form of a .dll file, named 'lame_enc.dll'. This file can be freely downloaded from
http://www.rarewares.org/mp3-lame-bundle.php. Once installed be sure to set the path to the library in the MP3 tab of the preferences dialog, accessed from the file menu.
For Mac:Obtain a copy of the LAME Quicktime Installer (newest version is available temporarily by sending an email requesting it to info @ sagantech.biz).
Run the installer. When outputting an audio file using Quicktime an option for LAME Mp3 will appear.
LAME's main site is here:
http://www.mp3dev.org =============================================================
Well unfortunately the updated link appears to again be broken.
I haven't tried it yet but I think
this linkshould work.
=============================================================
The original message (below) is outdated and the links are now dead. However the LAME Encoder, Quicktime Component, and Framework are now all included in an installer that makes this easy. It is also now a Universal Binary, meaning it will work on both PowerPC and Intel platforms. Here is the new
link.
======================== Original Message ========================
I happy to announce that is pretty easy to get Metro to export stereo files as MP3 directly from the export menu using the LAME encoder. To install this you will need two different downloads.
The first is the
Quicktime LAME MP3 Encoder and the second is the
LAME Framework.
Both will need to be installed separately. There seems to be a major problem if the source file is mono. It outputs buzz. It does work nicely for stereo files but there is no way to set the output bit rate. Perhaps an update will fix this soon.