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OpenCodecs is a software package for enabling HTML5 video on Microsoft Windows, particularly using the Theora and WebM codecs in Internet Explorer. It consists of:
- dshow, Xiph's DirectShow filters for their suite of Ogg formats, including Theora and Vorbis
- webmdshow, the DirectShow filter for WebM maintained by the WebM project
- An ActiveX plugin adding HTML5 video capability to Internet Explorer older than version 9
The DirectShow filters support all DirectShow applications (like Windows Media Player), not just Internet Explorer.