CODECS Lab is a new space on this site intended to showcase or comment on a selection of software features, especially ones that are part of ongoing work or that have been completed on a technical level but just have not yet found their place within the larger framework of the site. The initial focus will be on functionality that has been developed as part of my custom extensions to MediaWiki, usually with an eye to concerns that are specific to CODECS, but not exclusively so. It also includes examples and live demos to illustrate and clarify how these extensions are meant to be used and so how others can use them on their own wikis.