We proposeRefactorScore, an automatic evaluation metric for code.RefactorScorecomputes the number of refactor prone locations on each token in a candidate file and maps the occurrences into a quantile to produce a score.RefactorScoreis evaluated across 61,735 commits and uses a model calledRefactorBERTtrained to predict refactors on 1,111,246 commits. Finally, we validateRefactorScoreon a set of industry leading projects providing each with aRefactorScore. We calibrateRefactorScore's detection of low quality code with human developers through a human subject study.RefactorBERT, the model driving the scoring mechanism, is capable of predicting defects and refactors predicted byRefDiff 2.0. To our knowledge, our approach, coupled with the use of large scale data for training and validated with human developers, is the first code quality scoring metric of its kind.

Video coding for Internet applications faces major challenges. Due to the heterogeneity of the network, users with very different access bandwidths to the Internet want to receive videos of the best possible quality. A good coding scheme for layered video pursues the following major goal: it maximises the subjective visual quality at a given bandwidth. In this article, we present four different techniques for video layering. The work focuses on an evaluation carried out on 30 test probands. The objective was twofold: finding both a suitable metric for automatic video quality assessment, as well as the best layering technique. The experimental results lead us to pronounce recommendations on the metric for automatic video quality assessment, and on a best video layering technique with regard to human perception.

Distributed interactive media are media that involve communication over a computer network as well as user interactions with the medium itself. Examples of this kind of media are shared whiteboard presentations and networked computer games. One key problem of this media class is that a large amount of common functionality is currently redesigned and redeveloped for each single medium. In order to solve this problem we present a media model and an application level protocol called RTP/I. Derived from the experience gained with audio and video transmission using RTP, RTP/I is defined as a new protocol framework which reuses many aspects of RTP while it is thoroughly adapted to meet the demands of distributed interactive media. By identifying and supporting the common aspects of distributed interactive media RTP/I allows the reuse of key functionality in form of generic services. Furthermore RTP/I makes it possible for applications of different vendors to interact with each other in a standardized way.

In this paper we present a generic late-join service for distributed interactive media, i.e, networked media which involve user interactions. Examples for distributed interactive media are shared whiteboards, networked computer games and distributed virtual environments. The generic late-join service allows a latecomer to join an ongoing session. This requires that the shared state of the medium is transmitted from the old participants of the session to the latecomer in an efficient and scalable way. In order to be generic and useful for a broad range of distributed interactive media, we have implemented the late-join service based on the Real Time Application Level Protocol for Distributed Interactive Media (RTP/I). All applications which employ this protocol can also use the generic late-join service. Furthermore the late-join service can be adapted to the specific needs of a given application by specifying policies for the late-join process. Applications which do use a different application level protocol than RTP/I may still use the concepts presented in this work. However, they will not be able to profit from our RTP/I based implementation.

Article Free Access Share on Transmitting MPEG-4 video streams over the Internet: problems and solutions Authors: Gerald Kühne University of Mannheim, Lehrstuhl für Praktische Informatik IV, L 15,16, 68131 Mannheim, Germany University of Mannheim, Lehrstuhl für Praktische Informatik IV, L 15,16, 68131 Mannheim, GermanyView Profile , Christoph Kuhmünch University of Mannheim, Lehrstuhl für Praktische Informatik IV, L 15,16, 68131 Mannheim, Germany University of Mannheim, Lehrstuhl für Praktische Informatik IV, L 15,16, 68131 Mannheim, GermanyView Profile Authors Info & Claims MULTIMEDIA '99: Proceedings of the seventh ACM international conference on Multimedia (Part 2)October 1999 Pages 135–138https://doi.org/10.1145/319878.319914Published:01 October 1999Publication History 8citation1,070DownloadsMetricsTotal Citations8Total Downloads1,070Last 12 Months16Last 6 weeks1 Get Citation AlertsNew Citation Alert added!This alert has been successfully added and will be sent to:You will be notified whenever a record that you have chosen has been cited.To manage your alert preferences, click on the button below.Manage my AlertsNew Citation Alert!Please log in to your account Save to BinderSave to BinderCreate a New BinderNameCancelCreateExport CitationPublisher SiteeReaderPDF