Luk Overmeire

VRT · Research and Innovation

Modern media production workflows involve specialized teams operating during different phases of the production process in different locations. The media themselves are digital but managed by singular media asset management systems in each location. Due to structural gaps in the overall flow of metadata, collaboration relies on informal methods. As...

After the transition to file-based workflows, broadcasters and production companies are facing new technological challenges. New business opportunities encourage programmakers to tell their stories on multiple distribution platforms, but they typically lack tools and platforms to do so efficiently. Furthermore, production platforms should embrace t...

In past years, broadcasters adopted file-based workflows to enable faster-than-realtime and concurrent media processing, thereby improving production efficiency. This introduction turned out to be highly challenging, in particular with respect to the integration of different file-based islands into an optimized end-to-end workflow. Now that most is...

Introduction – From Tape-Based to File-Based ProductionBroadcast Production Chain Reference ModelCodec Requirements for Broadcasting ApplicationsOverview of State-of-the-Art HD Compression SchemesJPEG 2000 ApplicationsMultigeneration Production ProcessesJPEG 2000 Comparison with SVCConclusion References

The integration of MAM-based systems with focus on video editing, and solutions based on technologies such as Material eXchange Format (MXF), the Advanced Authoring Format (AAF), Unique Material Identifier (UMID), Service Oriented Architecture (SOA) and metadata exchange frameworks (P/Meta, the EBU metadata exchange scheme) is discussed. The UMID i...

In the literature, several rate control techniques have been proposed to aim at the optimal quality of digitally encoded video under given bit budget, channel rate and buffer size constraints. Typically, these approaches are group-of-picture (GOP) based. For longer, heterogeneous sequences, they become unacceptably complex or struggle with model mi...

An enhanced, off-line, segment-based rate control approach is proposed for controlling the distortion variation across successive segments of a video sequence when encoding with single-layer (MPEG-4 Baseline, MPEG-4 AVC) and wavelet video codecs. Consistent quality is achieved by a time-efficient, predictive rate-distortion modeling per segment. Th...

The vision of networked devices, and ubiquitous computing; has long been predicted, but is still waiting to be realised. Many attempts to build the networked home have stranded in technological obsession and gadgetry. Putting the family on-line goes beyond the excitement of controlling light bulbs and washing machines, it's about the family's virtu...

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An off-line shot-based rate control approach is proposed for controlling the distortion variation across successive shots of a video sequence when encoding with single-layer (MPEG-4 Baseline, MPEG-4 AVC, Windows Media 9) and scalable (wavelet) video codecs. Consistent quality is achieved by optimally distributing the available bits among the differ...