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Lesson 5Including video in a Web page
ObjectiveDescribe Common Formats used for Video Elements on a website.

Embedding Video into Website

Just as streaming audio files are revolutionizing music on the Web, video files are revolutionizing motion on the Web. Like the other formats, video files use file extensions with a unique format.

QuickTime (MOV)

QuickTime (MOV) is a video and animation system developed by Apple that supports full-motion video and animation with synchronized sound. QuickTime files end with a .mov extension and run on Macintosh systems. Windows/NT systems need a special QuickTime driver to run QuickTime files.

MPEG

Motion Pictures Experts Group (MPEG) is a movie file format that is an international standard multimedia file format for compressing video on any platform. It provides lossy compression, meaning you lose some information from the original image. MPEG-2 standards provide CD-quality audio.

RAM

RealAudio (RAM) is reference file not specific to any particular platform.
RealAudio is a proprietary audio format developed by RealNetworks and first released in April 1995. It uses a variety of audio codecs including high-fidelity formats for music. It can also be used as a streaming audio format, that is played at the same time as it is downloaded. Many internet radio stations used RealAudio to stream their programming over the internet in real time.

AVI

Audio Video Interleaved (AVI) is developed by Microsoft and is the most common file format for full motion video and animation with sound on the PC platform. It is a computer file format that contains audio and video data and is used to play back the audio and video data simultaneously.

Definition of Video Compression

Video compression is a process of reducing the amount of digital data used to represent a sequence of images normally varying in time and intended to portray motion subject to the requirements that the quality of the reconstructed video is sufficient for a certain application and the complexity of the computation involved is appropriate for that application.
Some researchers, for example, Shi and Sun Microsystems (now Oracle) use the term video to refer exclusively to image frames and sequences associated with the visible band of the electromagnetic spectrum while others, for example, Tekalp refer exclusively to sequences.
In the next lesson, you will learn about common formats used for compressing files.