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AZHARUDDIN UOMIA
Challenges for Multimedia Systems
Supporting multimedia applications over a computer network renders the application distributed. This will involve many special computing techniques -- discussed later.
Multimedia systems may have to render a variety of media at the same instant -- a distinction from normal applications. There is a temporal relationship between many forms of media (e.g.Video and Audio. There 2 are forms of problems here
- Sequencing within the media -- playing frames in correct order/time frame in video
- Synchronisation -- inter-media scheduling (e.g. Video and Audio). Lip synchronisation is clearly important for humans to watch playback of video and audio and even animation and audio. Ever tried watching an out of (lip) sync film for a long time?
The key issues multimedia systems need to deal with here are:
- How to represent and store temporal information.
- How to strictly maintain the temporal relationships on play back/retrieval
- What process are involved in the above.
Data has to represented digitally so many initial source of data needs to be digitise -- translated from analog source to digital representation. The will involve scanning (graphics, still images), sampling (audio/video) although digital cameras now exist for direct scene to digital capture of images and video.
The data is large several Mb easily for audio and video -- therefore storage, transfer (bandwidth) and processing overheads are high. Data compression techniques very common.
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