From blag.wiki.aktivix.org

BLAG comes with many Free Software versions of codecs and will likely play the file you want out of the box.

Non free

Non Free Software codecs are available such as those from

http://www.mplayerhq.hu

Simply download the tar file, extract it's contents and place in /user/local/lib/codecs directory.

su
cd /tmp
wget http://www.mplayerhq.hu/MPlayer/releases/codecs/all-20071007.tar.bz2
tar -jxvf all-20071007.tar.bz2
mkdir -p /usr/local/lib/codecs'
cp all-20071007/* /usr/local/lib/codecs'
rm -rf /tmp/all-20071007*

In order to help other programs see them, create the following link

su
ln -sf /usr/local/lib/codecs /usr/lib/codecs

Why is it not included by default?

Jebba the blag developer had a conversation with Richard Stallman about BLAG and proprietary codecs:

RMS wrote: The practice of using the non-free codecs is one of the major obstacles that free software faces, and the only way to surmount it is for people to start pushing back. The strategy you've adopted on this front is one of surrender.

RMS wrote: However, I think we should not miss the opportunity to educate the public about the need to change their practices and stop using those formats. We need to look for opportunities to do that.

The w32 Codec has now been removed and Blag is 100% free software.

For the full discussion go here http://forums.blagblagblag.org/viewtopic.php?t=571

Converting to free codecs

If you have non free codecs installed, you can take the opportunity to convert the files that need them to formats that use free codecs using mencoder