FrameCell Loss Ratio Jitter Playback Jitter is the standard deviation between

Framecell loss ratio jitter playback jitter is the

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Frame/Cell Loss Ratio Jitter -- Playback Jitter is the standard deviation between frame playback. It is a measure of smoothness. Synchronization Audio signal usually has a higher priority Video Server Algorithms Video prioritization algorithms set priorities to minimize playback jitter. Retransmission is not a good method for error correction in multimedia data transmission a late frame in audio/video is a lost frame Admission Control is important for bandwidth management Multimedia System 030728.ppt 63 Multimedia Data Replication Duplication vs Replication Duplication is to make a copy of the data / contents. CD Duplication Using CD recordable disc and make an exact copy of the source disk Replication is the process of creating and managing duplicate versions of a database. Replication not only copies a database but also synchronizes a set of replicas so that changes made to one replica are reflected in all the others. CD Replication Using injection molding machines to create the disk A mechanism is required for network data replication. Multimedia System 030728.ppt 64 Multimedia Network Standards Call Control System control Audio coding Video coding Multimedia multiplex and synchronization Network adaptation Network interface Data • The general protocol stack of H-series audiovisual communication terminal
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Multimedia System 030728.ppt 65 Multimedia Data Interface – Text and Graphics Files The Rich Text Format (RTF) Specification provides a method of transferring encoding formatted text and graphics between different output devices, OS and applications. RTF uses the American National Standards Institute (ANSI), PC-8, Macintosh, or IBM PC character set to control the representation and formatting of a document, both on the screen and in print. RTF files begins with control word “\rtfN”; where N is the major version number. An entire RTF file is consider a group and must be enclosed in braces. Current version is 1.7, hence the file will begin with {\rtf1\ansi\ansicpg1252\ .... }….. Multimedia System 030728.ppt 66 File Format – Image file TIFF Tag image file format (TIFF) is typically used to transfer graphics from one computer system to another. TIFF is an excellent method of transporting images between file systems and software packages. It is supported by most graphics packages and has a high resolutions that is typically used when scanning images and colours of up to 48 bits. It can use different compression methods and different file formats, depending on the type of data stored. Multimedia System 030728.ppt 67 File Format - Image TIFF file structure: TIFF files have a three-level hierarchy 1. A file header: It contains 8 bytes 2. One or more IFDs (image file directories): These contain codes and their data (or pointers to the data) 3. Data: The data information Multimedia System 030728.ppt 68 File Format – Audio WAVE Native sound format by Microsoft Based on Interchange File Format (IFF) from Electronic Arts for Amiga Basis of Apple’s AIFF (Audio IFF) One of the RIFF file The other is AVI File begins with RIFF But we can use compression in WAVE files
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Multimedia System 030728.ppt
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