Nokia 9290 Video Style Guide - Page 12

Nokia Mobile Phones Nokia 9290 Communicator Video Editing for the Nokia 9290 Communicator 12(12) Q: Which are the most important / most common video formats? Conceptually, there is a difference between the video coding format and the video file format. The coding format is related to the action of a specific coding algorithm that codes the content information into a codestream. The file format is a way of organising video and audio codestreams in such a way that they can be accessed for local decoding and playback or streamed over a transport channel. The following list mentions some of the most common video coding formats today: • MPEG-1, which is used in video CDs, for example. • MPEG-2, which is used in DVDs and satellite broadcasts, for example. • H.263, which is commonly used in video conferencing systems. • RealVideo, which is the video coding format of the popular RealSystem video streaming application. • Microsoft MPEG-4, which is an evolution of the MPEG-4 standard and commonly used in Windows Media. The following list mentions some of the most common video file formats today: • Microsoft Audio-Video Interleaved (AVI). • Apple QuickTime file format. • MPEG-1 file format. Q: How about in mobile devices? There is no widely used video format in mobile devices today. The standardisation of the terminal multimedia capabilities for the third generation mobile networks is underway. It seems that H.263 video coding and AMR speech coding are key technologies in upcoming standards and terminals. Copyright  Nokia Corporation 2001-2002. All rights reserved.