The recently finalized Versatile Video Coding (VVC) standard promises to reduce the video bitrate by 50% compared to its predecessor, High Efficiency Video Coding (HEVC). The increased efficiency comes at a cost of increased computational burden. The Fraunhofer Versatile Video Encoder VVenC is the first openly available optimized implementation providing access to VVC's efficiency at only 46% of the runtime of the VVC test model VTM, when not using multi-threading. An alternative operating point allows 30× faster encoding for the price of around 12% bitrate increase, while still providing around 38% bitrate reduction compared to HEVC test model HM. In the fastest configuration, VVenC runs over 140× faster than VTM while still providing over 10% bitrate reduction compared to HM. Even faster encoding is possible with multi-threading. This paper provides an overview of VVenC's main features and some evaluation results.

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Mobility is considered a key technology of the next generation Internet and has been standardized within the IETF. Rapidly emerging multimedia group applications such as IPTV, massive mutliplayer games (MMORPGs) and video conferencing increase the demand for mobile group communication, but a standard design of mobile multicast is still awaited. The open problem poses significant operational and security challenges to the Internet infrastructure. This paper introduces a protocol framework for authenticating multicast sources (MSs) and securing their mobility handovers. Its contribution is twofold: at first, the current mobile multicast problem and solution spaces are summarized from the security perspective. At second, a solution to the mobile source authentication problem is presented that complies to IPv6 mobility signaling standards. Using an autonomously verifiable oneway authentication based on cryptographically generated addresses, a common design is derived to jointly comply with the mobile any source and source specific multicast (SSM) protocols that are currently proposed. This lightweight scheme smoothly extends the unicast enhanced route optimization for mobile IPv6 and adds only little overhead to multicast packets and protocol operations.Voice and video (group) conferencing, as well as large scale content distribution, e.g., IPTV or massive mutliplayer games (MMORPGs) are considered the key applications for the next generation ubiquitous Internet. Inexpensive, point-to-multipoint enabled technologies such as 802.16 or DVB-H/IPDC emerge on the subnetwork layer and facilitate large-scale group communication deployment. Unlike point-to-point mobility and despite of 10 years of active research, mobile

A rapidly growing number of carriers offer wireless video services to their customers, taking advantage of high quality video codecs implemented in dedicated hardware of selected mobile devices. In this paper we introduce a video conferencing software, which seamlessly integrates mobile with stationary users in a provider and device independent fashion. Innovations of this work are twofold. At first we report on a mobile realization of an H.264 video codec and its performance on a standard consumer Smartphone. Operating within the tight bounds of real-time compliance on mobiles, this software is an adapted version of a highly optimized H.264 codec. This DAVC codec, which we introduce along the line, significantly outperforms compatible H.264 realizations and allows for a scalable adaptation of its frame rate. In the second part we present a barrier-resistant peer-to-peer group communication scheme, which scales well for medium-size conferences and accounts for the heterogeneous nature of mobile and stationary participants. An outlook on mobility related group communication issues and future optimizations based on structured communication layers concludes the work.

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