|What setting were you expecting to change? |
Codecs are essentially drivers. They take the code from the audio/video file, decode it and send it to the audio/video device for processing. As such there are not settings that need to be changed, they either work or they don't.
If they don't work you find some that do. Either reinstall or download new ones.
If they do work you leave them alone because you cant fix sometime that isn't broke.