Holfelder W. "Interactive remote recording and playback of multicast videoconferences". Proc. of IDMS'97, Darmstadt, Germany, Sep. 1997.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....a product of the SIEMENS AG. B. Generic Recording Service for RTP I The ability to record a session is one of the most important and universally needed aspects of video conferencing. So far the generic recording of audio and video streams has been investigated and understood to a large extent [20]. There also exist first approaches to record the data trans mitted by a specific shared whiteboard [21] Due to the lack of a common application level protocol, a generic recording service for distributed interactive media was long thought to be infeasible. However, since RTP I provides the re ....

W. Holfelder, "Interactive Remote Recording and Playback of Multicast Videoconferences," in Proc. of the International Workshop on Interactive Distributed Multimedia Systems and Telecommunication Services 1997.

....choose the session participants that will send the state lists. 5 The Recording Service 5.1 Recording RTP Packets With the growing number of real time transmissions on the Internet, the need arose to record some of the transmissions. Meanwhile a number of RTP recorders exist (e.g. the MBone VCR [11]) accomplishing this task at least for video and audio streams. These recorders store media streams packetized in RTP. The major advantage is that the mechanisms implemented in a recorder can build upon RTP and do not depend a specific media encoding. For example, a recorder may synchronize audio ....

.... have implemented a recorder for a shared whiteboard [7] the digital lecture board (dlb) 6] The digital lecture board uses a specific RTP payload format for the transmission of data on top of the reliable multicast protocol SMP [6] The recorder for the dlb is implemented based on the MBone VCR [11], which is used to store the plain RTP packets in synchronization with other media streams. The dlb recorder extends the MBone VCR in two respects: First, it handles reliable multicast towards the shared whiteboard by adding SMP headers during playback and stripping them during recording. The SMP ....

W. Holfelder. Interactive Remote Recording and Playback of Multicast Videoconferences. In: Proc. of Interactive Distributed Multimedia Systems and Telecommunication Services (IDMS'97), Darmstadt, pp. 450-463. Springer Verlag, Berlin, September 1997.

....reason, we have defined an RTP profile [10] that covers common aspects of the distribution of interactive media. It can be instantiated for a specific interactive media encoding. The RTP profile for audio and video has enabled the development of generic recording services like those described in [4][15] The RTP audio and video recorders operate independently of a specific video or audio encoding. Instead of decoding incoming RTP packets and storing video and audio content (e.g. in H.261 or MPEG format) they operate on entire RTP packets. This has the major advantage that the mechanisms ....

....ignored, e.g. if the sender currently has no resources to satisfy them. The sender must be aware that the quality of the service offered by the requesting application will decrease if requests are ignored. 5 RTP Recording Service An RTP recording service such as the MBone VCR on Demand (MVoD) [4] usually handles two network sessions (see Figure 3) In the first, the recorder participates in the multicast transmission of the RTP media data. Depending on its mode of operation (recording or playback) it acts as a receiver or sender towards the other participants of the session. A second ....

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W. Holfelder. Interactive Remote Recording and Playback of Multicast Videoconferences. In: Proc. IDMS '97, Darmstadt, pp. 450-463, LNCS 1309, Springer Verlag, Berlin, September 1997.

....whiteboard annotations etc. Students or users who missed a session or who want to review a certain topic are able to retrieve a previously recorded lecture from a server. In order to be able to use existing recording facilities such as the VCRoD service (Video Conference Recording on Demand) [6], we rely on the Internet RTP standard [8] for transmitting data between distributed instances of the dlb. Security. Many existing teleconferencing applications neglect security issues almost completely, even though security is extremely important to allow for private sessions and billing, ....

Holfelder, W.: "Interactive Remote Recording and Playback of Multicast Videoconferences". In: Proc. IDMS'97, Springer, LNCS 1309, 1997, p. 450-463.

....video. In contrast, our aim is to record the data in its original format. This provides a higher quality than a captured video and it allows for further processing and usage of the data. 137 6.4. 2 RTP Recording Service We used the existing RTP recording service MBone VCR on Demand (MVoD) [36,37] as the starting point for our development of a generic RTP I recording service. An RTP recording service such as the MVoD usually handles two network sessions (see Figure 46) In the first the recorder participates as if it were a regular participant. Depending on its mode of operation (recording ....

W. Holfelder. Interactive Remote Recording and Playback of Multicast Videoconferences. In: Proc. of the International Workshop on Interactive Distributed Multimedia Systems and Telecommunications Services (IDMS) '97, Darmstadt, Germany, R. Steinmetz and L. Wolf (Eds.), LNCS 1309, Springer Verlag, Berlin, Germany, 1997, pp. 450 - 463.

....a product of the SIEMENS AG. B. Generic Recording Service for RTP I The ability to record a session is one of the most important and universally needed aspects of video conferencing. So far the generic recording of audio and video streams has been investigated and understood to a large extent [20]. There also exist rst approaches to record the data transmitted by a speci c shared whiteboard [21] Due to the lack of a common application level protocol, a generic recording service for distributed interactive media was long thought to be infeasible. However, since RTP I provides the required ....

W. Holfelder, \Interactive Remote Recording and Playback of Multicast Videoconferences," in Proc. of the International Workshop on Interactive Distributed Multimedia Systems and Telecommunication Services

....also incorporate format converters and parts of the media tools. 4.3 Existing Multicast Multimedia Servers It is important to review briefly some systems that now exist. Some of the system components identified in Fig. 1 may be missing in specific implementations. The MBone VCR On Demand (MvoD)[24] system offers interactive remote recording playback of MBone sessions. The client (VCR like interface) can initiate and control the facilities of the remote server. The system has its own protocols for client server communication and an interface to SAP for receiving session announcements. MVoD ....

W.Holfelder - "Interactive Remote Recording and Playback of Multicast Videoconferences" -- IDMS'97

....videoconferencing sessions. MBone VCR [15] is the first application that supported interactive, synchronized recording and playback of MBone sessions. However, it was a single user application that simply dumps packets to a local file and cannot be access through a distributed system. MBone VCRoD [16] is a client server based system for interactive remote recording and playback of MBone sessions. Schuett et al. also present a recording system for MBone conferencing system [2] It uses multiple distributed recorders placed close to the source of session in order to get high quality archives. ....

W. Holfelder: "Interactive Remote Recording and Playback of Multicast Videoconferences" 4th. International Workshop on Interactive Distributed Multimedia Systems and Telecomminication Services (IDMS '97).

....in a manner similar to how many VCR s operate for television programs, i.e. a person can watch and record at the same time but cannot use VCR functions while recording. The MBone VCR[18] is one tool that provides this traditional functionality. An alternative is the MBone VCR on Demand (MVoD) tool[19] though it adds the ability to record and play multicast sessions remotely, facilitating the creation of a VoD service. The Multicast Multimedia On Demand (mMOD) tool[20] performs similar VoD functionality but adds a WWW based playout request mechanism and attempts to improve playout quality. None ....

W. Holfelder, "Interactive remote recording and playback of multicast videoconferences," in Workshop on Interactive Distributed Multimedia Systems and Telecommunication Services (IDMS), (Darmstadt, GERMANY), September 1997.

....through channels without multicast capabilities. The system fulfils not only the requirements of the Interactive Home Learning scenario but can also be integrated into other services e.g. Media on Demand servers and databases as they have been realised in Wieland Holfelder s MBone VCRoD [Hol97] and the mMOD by Peter Parnes [Par97a] The remainder paper is structured as follows: The next section summarises related work, and is followed by an analysis of the technical requirements of the scenario. Section 4 describes in detail the technical problems that have to be overcome in order to ....

Wieland Holfelder. Interactive Remote Recording and Playback of Multicast Videoconferences. In Proc. 4 th International Workshop on Interactive Distributed Multimedia Systems and Telecomminication Services (IDMS '97), 4. IDMS, September 1997.

....a computer science lecture. As a further add on we plan to integrate several recorded and digitized audio and video shots which were recorded to the hypertext material. Several commercial solutions 1 exist which accomplish this already. As an alternative we will take Wieland Holfelder s MBone VCR[Hol95, Hol97] from Wieland into account. The VCR allows us to record various RTP streams (e.g. audio and video) from any MBone session. ffl In the synchronous learning peroid, production and consumption of the lectures take place synchronously, i.e. at the same time. In this peroid we plan 1 Two examples for ....

Wieland Holfelder. Interactive Remote Recording and Playback of Multicast Videoconferences. In IDMS'97 (to be held in Darmstadt), September 1997. accepted paper.

....of a recorded XML index Figure 5: Event based meeting transcript 5. RELATED WORK There exist several applications that can record MBone videoconferences. Henning Schulzrinne has written an RTP dump utility for basic packet dump recordings of RTP multicast sessions. Holfelder s MVCRoD [7] provides VCRlike services for interactive and remote recording and playback of video and audio MBone sessions. Schuett et.al. built the MARS archiver and client [18] as well as the MASH Player and Recorder using the Berkeley MASH multimedia toolkit [13] The MASH Player and Recorder work are ....

Wieland Holfelder. Interactive Remote Recording and Playback of Multicast Videoconferences. Interactive Distributed Multimedia Systems and Telecommunications Services 4th International Workshop:450--463, 1997.

....whiteboard annotations etc. Students or users who missed a session or who want to review a certain topic are able to retrieve a previously recorded lecture from a server. In order to be able to use existing recording facilities such as the VCRoD service (Video Conference Recording on Demand) [12], we rely on the Internet RTP standard [19] for transmitting data between distributed instances of the dlb. Security. Many existing teleconferencing applications neglect security issues almost completely, even though security is extremely important to allow for private sessions and billing, ....

Holfelder, W.: Interactive Remote Recording and Playback of Multicast Videoconferences. In: Proc. IDMS'97, Springer, LNCS 1309, 1997, p. 450-463.

....the MBone[3] has been the focal point for developing multicast[4] and real time protocols[5] for the scalable delivery of multimedia streams. Like the IMJ, related efforts are looking at extending the use of the MBone beyond applications like interactive conferencing and program broadcasts[6, 7, 8, 9]. An inherent need when transmitting reasonably high bandwidth media streams is the need to deal with receivers who have heterogeneous bandwidth capabilities. Researchers are beginning to experiment with layered encoding or multi stream schemes[10, 11, 12, 13] Recent work has also looked at ....

W. Holfelder, "Interactive remote recording and playback of multicast videoconferences," in 4th. International Workshop on Interactive Distributed Multimedia Systems and Telecommunication Services (IDMS '97), (Darmstadt, GERMANY), September 1997.

....the MBone[3] has been the focal point for developing multicast[4] and real time protocols[5] for the scalable delivery of multimedia streams. Like the IMJ, related efforts are looking at extending the use of the MBone beyond applications like interactive conferencing and program broadcasts[6, 7, 8, 9]. Finally, recent work has looked at integrating the services of the MBone and the Real Time Protocol (RTP) into the the WWW. Several researchers are looking at various ways of using the MBone and multicast protocols to deliver WWW pages[10, 11, 12, 13] Other issues are based on the integration ....

W. Holfelder, "Interactive remote recording and playback of multicast videoconferences," in 4th. International Workshop on Interactive Distributed Multimedia Systems and Telecommunication Services (IDMS '97), (Darmstadt, GERMANY), September 1997.

....animations and exercises that interactively return feedback and a sample solution to the students. In order to record the audio and video data streams of a lecture, we are using a tool for remote recording and playback of multicast videoconferences called MBone Video Conference Recorder or VCR [Hol97]. During the Summer semesters 1998 and 1999 we have recorded audio and video of the course Multimedia Technology with this tool and during the Winter semester 1998 99 we have recorded the course Computer Networks. Based on the audio and video material and the transparencies of the lectures we have ....

Wieland Holfelder. "Interactive Remote Recording and Playback of Multicast Videoconferences." In Proc. 4th International Workshop on Interactive Distributed Multimedia Systems and Telecomminication Services (IDMS) `97, volume 1309, pages 450-463. Lecture Notes in Computer Science (LNCS), Springer-Verlag, Heidelberg, September 1997.

....tool into MINT. By stripping VIC of its user interface and replacing it with a PMM message handling interface, we can use VIC as an integral part of MINT. We are also working on integrating MINT with a video conference recording tool called the MBone video conference recording on demand (MVCRoD) [18]. This would give the user the possibility of recording the audio and video streams generated during a conferencing session and playing them out later. A major issue that we have not been able to handle yet, is the support of application sharing. For the distribution of slides and joint editing we ....

W. Holfelder. Interactive remote recording and playback of multicast videoconferences. In 4th. International Workshop on Interactive Distributed Multimedia Systems and Telecomminication Services (IDMS '97), Darmstadt, Germany, Sept. 1997.

....however, there will be a special multimedia document server which records the session. Then, there is no need for a local recording. In order to start session recording and to allow for a comfortable search for and playback of recorded sessions, we plan to employ a new technology described in [9], also including the MBone VCR. Normal operation: During normal operation, the quality of all streams is constantly monitored by the QoS monitor component. It checks the the incoming packets as well as the ability of the operating system to display the data in time. If a QoS violation occurs, ....

W. Holfelder. Interactive remote recording and playback of multicast videoconferences. Submitted to 4th European Workshop on Interactive Distributed Multimedia Systems and Telecommunication Services (IDMS'97), Darmstadt., 1997.

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Holfelder W. "Interactive remote recording and playback of multicast videoconferences". Proc. of IDMS'97, Darmstadt, Germany, Sep. 1997.

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Holfelder, W. (1997). Interactive remote recording and playback of multicast videoconferences. Proceedings of IDMS'97, Darmstadt, Germany, September.

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W. Holfelder, "Interactive remote recording and playback of multicast videoconferences," In Proc. of 4 th International Workshop on Interactive Distributed Multimedia Systems and Telecommunication Services (IDMS'97), Darmstadt, Germany, Sep. 1997.

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W. Holfelder, "Interactive remote recording and playback of multicast videoconferences", Proc. of IDMS'97, Darmstadt, Germany, Sept. 1997.

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W. Holfelder, "Interactive remote recording and playback of multicast videoconferences", Proc. of IDMS'97, Darmstadt, Germany, Sep. 1997.

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Holfelder, W. (1997). Interactive remote recording and playback of multicast videoconferences. Proceedings of IDMS'97, Darmstadt, Germany, September.

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W. Holfelder. Interactive Remote Recording and Playback of Multicast Videoconferences. In: Proc. International Workshop on Interactive Distributed Multimedia Systems and Telecommunication Services 1997 (IDMS'97), Darmstadt, Germany, R. Steinmetz, L. Wolf (Eds.), LNCS 1309, Springer Verlag, Berlin, pp. 450-463, September 1997.

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