Ralf Globisch

  • Citations Per Year
Learn More
Media delivery, especially video delivery over mobile channels may be affected by transmission bitrate variations or temporary link interruptions caused by changes in the channel conditions or the wireless interface. In this paper, we present the use of Priority-based Media Delivery (PMD) for Scalable Video Coding (SVC) to overcome link interruptions and(More)
Real-time video applications, such as video conferencing and video surveillance systems, typically involve the simultaneous transport of multiple video sources to interested parties that consume the content. It may be desirable to mix these multiple source videos into a single video stream at intermediary nodes in the network. This has the advantage of(More)
Dear Fellow MMTC Members, Time flies, and it has been almost two years since I served as the MMTC Chair from June 2012. In this message, I would like to call for nominations of MMTC officers for 2014-2016 and MMTC Service Awards of 2014. During the past two years, MMTC has continued to flourish through the dedicated services of many volunteers. 13 MMTC(More)
Delay-sensitive media applications typically prioritise timeliness over reliability, therefore preferring UDP over TCP. Retransmission is a method to compensate for packet loss and requires the receiver to provide timely feedback to the sender. Delaying the retransmission request too long may result in the retransmitted media arriving late. Alternatively,(More)
Adaptive streaming is a widely-used solution to avoid playback interruptions and compensate for insufficient bandwidth or momentary congestion. A temporary reduction in bitrate results in less or no video break-up and rebuffering. The rate control mechanism of a codec implementation allows the selection of a target bitrate and tries to meet this target(More)
In asymmetric group communication, active participants create the multimedia content, while the dormant/passive participant interactively consumes it. This use-case is visible in remote teaching, seminars and conferences. Asymmetric group communication imposes strict timing requirements that directly impact on the Quality of Service (QoS). We use(More)
  • 1