The MPEG-4 1 and MPEG-7 2 standards provide

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1 Multimedia at Work Editor: Tiziana Catarci University of Rome Authoring 744: Writing Descriptions to Create Content José M. Martínez Universidad Autónoma de Madrid Francisco Morán Universidad Politécnica de Madrid The MPEG-4 1 and MPEG-7 2 standards provide new ways for authoring, transporting, accessing, retrieving, and interacting with multimedia content. MPEG-4 is the first standard that supports interactive and complex audio visual presentations, while MPEG-7 standardizes the description of various types of multimedia content. Complex authoring tools are required to create the powerful reusable and interactive content allowed by MPEG-4. On the other hand, MPEG-7 describes content in a more natural manner. Currently, MPEG-7 applications extract the characteristic features of some existing content to generate a standardized description of it. This is the straightforward way of using MPEG-7, but it may be also possible to synthesize the content from such descriptions. This article introduces the first results of the Authoring 744 research initiative, which uses MPEG-7 to synthesize content instead of analyzing it. Authoring 744 aims to develop a prototype system that creates audio visual content through writing scripts and descriptions in a user-friendly GUI. By script writing we mean completing forms and choosing some media description examples (such as a melody s key, an object s shape and texture or its trajectory within the scene, and a region s dominant color). Potential applications Authoring 744 mostly provides an alternative multimedia authoring methodology that s simpler than traditional authoring tools and more human focused. Of course, this vision may yield (in most cases) only drafts of the audio visual content that will bring the author s idea to reality, but it will ease the quick creation of initial prototypes such as advertisement images, soundtracks, jingles, storyboards for a TV pilot series, publicity/music video clips, and so on. Nevertheless, in some cases, it should be possible to create final content. In fact, the synthesized content uses extensible MPEG-4 textual format A (XMT-A), which is part of MPEG-4 s XMT, 3 as the representation format. XMT-A is a textual representation of MPEG-4 using XML, 4 which provides a direct one-to-one mapping between MPEG-4 in both binary and textual representation formats. In the field of computer games, Authoring 744 could also be useful. A key asset for the design of any game is a toolset for content creation and conversion, providing artists with flexible solutions to recycle already existing 4D content to create new content. Among the tools in such a toolset, it would make a lot of sense to have one that semiautomatically synthesizes content from MPEG-7 descriptions. This would not only save design time, but also storage space, as it wouldn t be necessary to store different formats for a single object. Some game companies are already doing research on how to generate online game content from non-mpeg-7-compliant descriptions. This is hardly surprising, since the expected benefit of doing so is enormous: instead of having to generate and transmit potentially bulky audio visual content, very compact descriptions of it would be sent from servers to clients. Additionally, small parametric changes in the descriptions can generate totally new or significantly modified content, something much sought after by game companies trying to increase the replayability of their games. Another potential application of Authoring 744 is sheer compression. Instead of transmitting (or storing) the rendered version of audio visual content, it should be possible to transmit an MPEG-7 description of it and let the transcoding and rendering of that content be done at the client side (or at an intermediate network node, acting as a transcoder for a set of final client terminals). This would impose higher requirements for CPU and memory resources at the terminals (or proxies), but the compression benefits might X/03/$ IEEE Published by the IEEE Computer Society

2 well be worth it. Imagine, in the case of sound, the difference between transmitting the sound itself, even compressed with the most efficient tools, versus sending low-level (for example, pitch, volume, and duration) or higher level (such as statistical characterization of noise in a stadium) descriptions of it. Harmonizing MPEG-7 and MPEG-4 XMT Before starting our project, we had to ensure harmonization between MPEG-7 and MPEG-4. With MPEG-4 nodes, the harmonization consists of identifying the MPEG-7 description tools that can be mapped to XMT-A MPEG-4. Many times the MPEG-7 approach for describing content is similar to the MPEG-4 approach for representing it. For example, the structural description of content defined by MPEG-7 uses hierarchical decompositions (spatial, temporal, and media component ones), while MPEG-4 defines a hierarchy of nodes for the representation (composition) of a multimedia scene. This is a key point in the harmonization between both standards. MPEG-7 description tools (see the sidebar Current MPEG-7 Tools ) are standardized in ISO/IEC (MPEG-7) parts 3 (visual 5 ), 4 (audio 6 ), and 5 (multimedia description schemes, or MDS). MPEG-7 structural and audio visual description tools are mapped to MPEG-4 that represent MPEG-4 multimedia content. We can map MPEG-7 media information description tools to MPEG-4 elementary stream object descriptors and map creation information description tools to object content information object descriptors. We can map MPEG-7 visual description tools for color, movement, and location to the XMT-A covering the corresponding functionalities. However, we currently can t map MPEG-7 audio description tools to XMT-A, but we can use the tools for creating audio content (using additional audio creation tools) that s part of the multimedia scene, such as synthesizing a sound track. Current MPEG-7 Tools MPEG-7 description tools 1 currently cover six viewpoints: Basic and schema tools provide support for building the real descriptions, so no implicit matching is required. Content management tools cover the description of the media, creation and classification of content, and usage information. Most of these description tools have no direct use for creating content. However, some of them could be used to support intellectual property management and protection (IPMP) functionalities, and the identification of actors, presenters, and so on might help to synthesize characters in the content (or to create characters that would resemble the desired one). Content description tools (structural and conceptual) describe the content to be generated. Structural tools describe content in terms of segments: temporal, spatial, and spatio-temporal. Conceptual tools describe content in terms of the events, (semantic) objects, places, and times present in the content and the relationships among them. Content organization tools describe collections of objects, and although they may have future use (creation of similar contents), currently they aren t under consideration for Authoring 744. Navigation and access tools let users create alternative presentations of the content in terms of resolution views (in space and frequency), summaries, and transcoded variations (in resolution or media translation). These tools, although not directly implied in the generation of content, may be useful in providing hints for generating the alternative presentations of the content depending on the terminal, user, and network preferences. The user interaction tools currently cover only the description of user preferences and usage history, so they don t provide tools for creating content with interaction options. The only relevant tools for the Authoring 744 objective are the content description tools, although some description tools from content management and navigation and access may provide value-added functionalities. Reference 1. J.M. Martínez, Overview of MPEG-7 Description Tools, IEEE MultiMedia, vol. 9, no. 3, July Sept. 2002, pp Selected MPEG-7 description tools The MPEG-7 MDS tools currently used in the Authoring 744 software modules are for the description of an image or a 2D spatial region from an image or video frame. ImageText for the description of a spatial region in an image or a video frame containing text. for the description of a spatiotemporal region within a video. AudioSegment for the description of a (temporal) audio segment. AudioVisualRegion for the description of an audio visual content or a region of it. The audio is described as a temporal interval, while the October December 95

3 Multimedia at Work MPEG-7 Scriptr (MP7 ScriptrLite) 724Transcoder (724TranscoderLite) Figure 1. Authoring 744 general software architecture. User-friendly GUI (coming soon ) MPEG-7 description (.mp7) MPEG-4 XMT-A content (.xml) Transcoder2Play, (ENST s MP4 Manager 6.31) video is specified via a spatio-temporal region. MultimediaSegment for the description of a multimedia content or a segment of it. The segment is described as the decomposition of the different media sources segments (spatial and/or temporal ones). MediaSourceDecomposition for the description of the media sources decomposition of a segment. TemporalRelation classification schemes for the description of temporal relationships in the temporal organization of segments. Graph for the description of a graph of relationships among description instances. The MPEG-7 visual descriptors used are DominantColor for the description of the set of dominant colors of a region. MP4 content (.mp4) MotionTrajectory for the description of the temporal and spatial location of the representative points of an object. This descriptor provides an ordered list of key points and interpolation functions. Player (Envivio TV) the full mapping details in Rubio. 9 content representation format for mapping MPEG-7 to MPEG-4 nodes, we selected the appropriate MPEG-7 description tools and mapped them to XMT-A (and XMT-Ω). You can find the first results in Martínez et al. 8 and Software architecture The Authoring 744 prototype consists of the four software modules shown in Figure 1. Each box shows two names. The top one is the generic tool of our prototype and the bottom one (in parentheses) is the current implementation: 1. The MPEG-7 Scriptr tool lets the user write high-level descriptions of the content (or scene) to be generated and outputs an MPEG-7 description of the content. 2. The 724 Transcoder tool takes this output and creates the actual MPEG-4 XMT-A files. The advantages of using MPEG-4 XMT 3 are that it uses XML-Schema 4 (as MPEG-7 does) and that it s designed to be easily transcoded into MPEG-4 binary format for scenes (BIFS), Virtual Reality Modeling Language (VRML), or Synchronized Multimedia Integration Language (SMIL). This enables displaying the content in various terminals and within different applications. 3. The Transcoder2Play tools takes the MPEG-4 XMT-A files and produces the content in format suitable for the corresponding player. IEEE MultiMedia RegionLocator for the description of the location of regions within images and video frames. Currently, we haven t included any MPEG-7 audio description tool. Also, MPEG-7 lacks description tools for synthetic content. However, we re working toward identifying description tools for synthetic content for a future extension of our system. MPEG-7 and MPEG-4 XMT mapping After choosing MPEG-4 XMT as the target 4. The Player presents and allows interaction with the content. MPEG-7 Scriptr The MPEG-7 Scriptr generates the MPEG- 7 description (in XML) from the user input. The user specifies the multimedia content (or scene) in terms of high-level descriptions like coordinates of regions, colors, text (including font and size), temporal intervals, and media source locations (URLs). After completing the description of the different segments, we can define temporal relationships among segments of the same type. 96

4 Figure 2 illustrates the current implementation of this software module, called MP7ScriptrLite. 724Transcoder The 724Transcoder generates an XMT-A representation of the MPEG-7 description. The 724Transcoder parses the description and loads the information required for generating the corresponding XMT-A specified in the mapping. The output is an XMT-A file that includes all the nodes, object descriptors, and required BIFS commands. Currently, our implementation of the 724Transcoder, named 724TranscoderLite, only runs as a stand-alone application (see Figure 3). In the future, we ll upgrade the 724Transcoder to allow its use at the server side (to store and/or GUI (command line) ImageText AudioSegment AVRegion and generate graph ImageText AudioSegment AVRegion Figure 2. MP7ScriptrLite software architecture. MPEG-7 description Texture type InitialObject descriptor Figure TranscoderLite software architecture. geometry ImageText textual MPEG-7 descripton geometry AudioSegment audio route route XMT-A document AudioVisualRegion Extract object descriptor TemporalRelation AudioVisualRegion object descriptors BIFS commands October December

5 Multimedia at Work SMIL SVG XMT MPEG-7 X3D Figure 4. Playing XMT content. Figure 5. Abstraction of the example scene. Parse Compile MPEG-4 representation (MP4) SMIL player VRML browser MPEG-4 player transmit MPEG-4 XMT content) and at the terminal side (to reduce the size of storage and bit rate by storing and transmitting the description, which will then be transcoded just before presentation). Playing XMT content To play XMT content, we can translate the files to one of the following content representation standards (see Figure 4): SMIL, VRML, and MPEG-4. 3 As Figure 4 shows, we can parse and play the XMT content (representation) directly with a World Wide Web Consortium SMIL player, preprocess it to Web3D X3D, and play it back with a VRML player, or compile it to an MPEG-4 representation such as MP4, which an MPEG-4 player can then play. Because several freely available players exist, we re not currently implementing a tool for playing content, but integrating available ones. In the first phase, we integrated the tools for playing the XMT-A content as MPEG-4 files. For the Transcoder2Play module we re currently considering only a transcoder tool from MPEG-4 textual to binary. We integrated the MP4Tool (version 6.31) from École Nationale Supérieure des Télécommunications, or ENST (see MP4Tool transcodes from XMT-A to MPEG-4 binary representation format, allowing the possibility of importing audio, video, and image archives in the MP4 file. For playing the MPEG-4 file, we integrated the Envivio TV Player, a plug-in for playing MPEG-4 streams and files in the RealNetworks player (see for more information). Sample result Here we present an example where we created a multimedia scene containing video, text, audio, images, and geometric regions (static and moving ones). Figure 5 shows an abstraction of the scene, consisting of one audio visual region (playing two videos sequentially), two colored moving regions, three static regions (with temporal relationships among them and with different textures), and three textual regions (with temporal relationships among them). Colored moving region 1 with video texture (t = 2) Text Several lines of text (t= 2) 2 AV objects: sequential (t = 0, t= 25) The MP7ScriptrLite writes the scene script via an easy-to-use menu and generates an MPEG-7 description that s the output file for the 724TranscoderLite. Taking as input the output file resulting from the 724Transcoder- Lite, the MP4Tool generates the binary MPEG-4 file that the Envivio TV player plays (see Figure 6 for five moments of the scene play). with image texture with image texture Colored moving region 2 Conclusions We selected MPEG-4 and MPEG- 7, respectively, for content and description representation of the Authoring 744 research initiative. At this stage of our research, we believe that you can use this authoring methodology (writing descrip- 98

6 (a) (b) (c) Figure 6. Five moments from the generated content. (a) t = start, (b) t = 2 seconds, (c) t = 10 seconds, (d) t = 25 seconds, and (e) t = end. (d) (e) tions to be transcoded to content) to generate content as in a multimedia object editor. Current work includes developing a userfriendly GUI for the MP7ScriptrLite and additional MPEG-7 Scriptr modules. We ve begun exploring how to translate the conceptual information from MPEG-7 descriptions to MPEG- 4 content to create content using more abstract and generic components and concepts in the writing process. We ve also identified 10 the need for further MPEG-7 description tools such as the description of synthetic objects through the Animation Framework Extension (AFX). 11 MM References 1. R. Koenen, ed., MPEG-4 Overview, ISO/MPEG N5522, Mar J.M. Martínez, ed., Overview of the MPEG-7 Standard, ISO/MPEG N5525, Mar MPEG Systems Group, Final Draft Amendment of ISO/IEC :2001/Amd2 Information Technology Coding of Audio-Visual Objects Part 1: Systems Amendment 2: XMT (MPEG N4698), Mar D.C. Fallside, ed., XML Schema Part 0: Premiere (W3C Candidate Recommendation), Oct MPEG Video Group, Final Draft Int l Std. ISO/IEC Information Technology Multimedia Content Description Interface Part 3: Visual (MPEG N4358), July MPEG Audio Group, Final Draft Int l Std. ISO/IEC Information Technology Multimedia Content Description Interface Part 4: Audio (MPEG N4224), July MPEG Multimedia Description Schemes Group, Final Draft Int l Std. ISO/IEC Information Technology Multimedia Content Description Interface Part 5: Multimedia Description Schemes (MPEG N4242), July J.M. Martínez, L.F. Rubio, and F. Morán, Authoring 744: First Results, Proc. ACM Multimedia 2002 Conf., ACM Press, pp L.F. Rubio, Autoría de Documentos Multimedia Mediante Descripciones de Alto Nivel (Authoring Multimedia Documents via High-Level Descriptions), master s thesis, ETSI Telecomunicación, Univ. Politécnica de Madrid, July J.M. Martínez and F. Morán, From Descriptions to Content: Inverting the Sense (Authoring 744), Proc. Int l Conf. Media Futures 2001, 2001, pp M. Bourges-Sévenier et al., eds., Final Draft Int l Std. ISO/IEC Information Technology Coding of Audio-Visual Objects Part 16: Animation Framework extension (MPEG N5397), Dec Readers may contact José M. Martínez at Grupo de Tratamiento de Imágenes, Escuela Politécnica Superior, Universidad Autónoma de Madrid, Ctra. Colmenar Viejo, km. 15, E Madrid, Spain; JoseM.Martinez@uam.es. Contact editor Tiziana Catarci at the Dept. of Information Systems, Univ. of Rome La Sapienza, Via Salaria 113, Rome, Italy; catarci@dis.uniroma1.it. October December

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