RTVideo and RTAudio codecs are real-time Microsoft video and audio codecs developed for the Windows Live Messenger, Microsoft Office Communications Server 2007, Microsoft Office Communicator 2007 and Microsoft Office Live Meeting 2007 platforms. The RTAudio codec is designed for both high quality wideband and narrowband voice over IP (VoIP) applications, including applications such as, games, audio conferencing, and wireless applications over IP. The RTVideo codec provides high quality, efficient, robust real-time video communication over IP networks.

RTVideo video codec
RTAudio audio codec

The RTVideo codec is based on the SMPTE VC-1 codec and includes system-level enhancements for recovery of packet loss on IP networks.