DSM CC

Abstract: The lack of a session to guarantee long-lived service and a function for control over the delivery of real-time streaming data in HTTP was a barrier in supporting a Video-on-Demand (VoD) service over the Internet. Recently, this barrier has been overcome with the introduction of the Real-Time Streaming Protocol (RTSP). This paper presents the design and implementation of an end-to-end DAVIC (Digital Audio-Visual Council)-based VoD system to support the RTSP over the Internet infrastructure. A RTSP client can select VCR-like requests, which are sent in RTSP message format to RTSP-DSM gateway. In RTSP-DSM gateway, the messages are transformed user control commands encapsulated in DSM-CC (Digital Storage Media-Command and Control) format and sent to the server. Upon receipt of transformed commands, the server invokes a CORBA-based DSM-CC service gateway and the media stream pump to actually perform the requested operations. The reply messages from the server are sent to the client in RTSP message format by RTSP-DSM gateway. Our VoD system has successfully completed feasibility via the Movie-on-Demand trials at our department. The main contribution of this work lies in a simple and effective system integration of a CORBA-based DAVIC VoD server and an RTSP-supported VoD client for MPEG transmission over the Internet via the LAN connection.

Abstract: Two way Hybrid Fiber/Coax (HFC) networks are being rapidly deployed by major cable TV companies. This paper proposes an open platform consisting of a home set top box plus supporting network elements that would allow cable operators to offer advanced services that other delivery media would have difficulty in matching. The platform would support both analog and digital video broadcast delivery as well as provide two way Internet Protocol (IP) connectivity to the set top box. The set top box would combine the capabilities of a digital broadcast set top box and a network computer-like platform. It is recommended that such a platform supports open API's such as HTML and Java. With such tools, integrated video and data applications can be developed. The platform would be based on open standards such as the Society of Cable Telecommunications Engineers (SCTE) Digital Video Subcommittee standards for digital broadcast and interactive standards such as MPEG Part 6 (DSM-CC) and DAVIC.

Abstract: This paper shows the design, implementation and evaluation of an algorithm that allows the extraction of Transport Stream's (TS) data section for Digital Terrestrial Television (DTT), with the organization in a hierarchical file system and directories based on MPEG-2 standard ISO-13818-6: Extension for Digital Storage Media Command and Control (DSM-CC), in order to fully recover the media from interactive applications contained by the MPEG-2 TS stream. To check the validity of the algorithm, it was implemented in a software to evaluate the application extraction of different TS, verifying its correct operation, as it successfully recovered all directories and files from interactive applications.