Knowledge Base: 3GP, AVI, MPEG, MOV, WMV ...

Multimedia Glossary - 2   1   3   4
- 3GP, ASF, AVI, MPEG, QuickTime, MOV, RM, WMV, DivX, XviD etc.
3GP
3GP is the MPEG4 based video format used mostly in mobile terminals, such as mobile phones. This file format is designed for 3rd generation mobile devices.
3GPP is defined by the 3rd Generation Partnership Project and 3GPP is defined by 3rd Generation Partnership Project 2. They are the worldwide standards for the creation, delivery and playback of multimedia over 3rd generation. These standards seek to provide uniform delivery of rich multimedia over newly evolved, broadband mobile networks (3rd generation networks) to the latest multimedia-enabled wireless devices, such as cell phones.
ASF
ASF stands for Advanced Streaming Format.
ASF is a highly compressed file format that contains streaming video, audio. When an ASF file is played back, content is delivered to you as a continuous flow of data. You no longer have to wait for the whole video and audio file to fully download before you start to view them. So, this file format is specially designed to run on networks. When an AVI file is compressed and converted to an .asf file, the file begins playing after only a few seconds. ASF files can be played back with the Windows Media Player (provided the appropriate codecs are installed), streamed with Windows Media Services or optionally packaged with Windows Media Rights Manager. You can click here to find more information about ASF format.
AVI
AVI stands for Audio Video Interleaved and developed by Microsoft.
An AVI file can use different codecs and formats so there is no set format for an AVI file unlike for example standard VCD video which sets a standard for resolution, bitrates, and codecs used. Most commonly used video codecs that use AVI structure are M-JPEG and DivX.
MPEG
MPEG stands for Moving Picture Expert Group in charge of the development of standards for coded representation of digital audio and video. There are several audio/video formats which bear this group's name, such as MPEG1, MPEG2, MPEG4.  
MPEG1
MPEG1 format is often used in digital cameras and camcorders to capture small, easily transferable motion video clips. It is also the compression format used to create Video CDs. In addition, The well-known MP3 audio format is part of the MPEG1 codec.
MPEG2
MPEG2 format, a video standard developed by MPEG group, is often used in digital TVs, DVD movies and in SVCDs. It is not a successor for MPEG1, but an addition instead. both of these formats have their own purposes in life. MPEG1 is meant for medium-bandwidth usage and MPEG2 is meant for high-bandwidth/broadband usage.
MPEG4
MPEG4, the latest compression method standardized by MPEG group, is used for both streaming and downloadable web content, and is also the video format employed by a growing number of portable video recorders. One of the best-known MPEG4 encoders is DivX which since version 5 has been fully standard-compliant MPEG4 encoder.
MPEG7
MPEG7 doesn't itself offer any new encoding features and it is not meant for representing audio/video content, unlike its siblings MPEG1, MPEG2 and MPEG4. Instead, it offers metadata information for audio and video files, allowing searching and indexing of audio/video data based on the information about the content instead of searching the actual content bitstream.
MPEG7 is based on XML and therefor is universal and all the existing tools that support XML parsing should be able to read the data as well, provided that they can ignore binary parts of the file.
MPEG7 is not used at the moment, but it is under serious development and standardization process at the moment and hopefully we see first fully featured MPEG-7 tools within few years.
QuickTime
QuickTime is a file format for storing and playing back movies with sound. Though developed and supported primarily by Apple Computer, this flexible format isn't limited to Macintosh operating systems. it's also commonly used in Windows systems, and other types of computing platforms. In Windows, QuickTime files usually appear with the ".MOV" filename extension.
Since 2002, Apple has started using MPEG4 video encoding on its QT streams, producing much better, if not excellent, video quality.
MOV
MOV is a file extension used by the QuickTime-wrapped files.
QuickTime Content (.mov, .qt), developed by Apple Computer, is a file format for storing and playing back movies with sound. This flexible format isn't limited to Macintosh operating systems. It's also commonly used in Windows systems, and other types of computing platforms.
RA
RA stands for Real Audio.
RA is a Real Media audio file extension, indicating a file readable by the RealOne Media Player.
RealVideo
RealVideo is a streaming video format developed by RealNetworks. RealVideo is probably the most popular streaming video format in the world, although its quality is horrible if you compare it to MPEG4-based formats like DivX or WMV.
RM
RM stands for Real Media.
Real Media is one of the most popular formats for streaming content on the Internet, RealMedia includes the RealAudio codec for sound clips and RealVideo codec for movies. RealAudio and RealVideo files are often given the common RealMedia ".RM" file extension. RealMedia files are often heavily compressed so they can stream over dial-up Internet connections.
RMVB
RMVB stands for Real Media Variable Bitrate.
RMVB is commonly used to contain Real Video 9 and RA (Real Audio).
WMV
WMV stands for Windows Media Video.
WMV, developed by Microsoft, is a generic name of Microsoft's video encoding solutions and doesn't necessarily define the technology what it uses. In WMV7, Microsoft has used its own flavour of MPEG4 video encoding technology. You can use a .wmv file either to download and play files or to stream content.
Windows Media Video is used for both streaming and downloading content via the Internet. Microsoft's Windows Media Player, an application bundled with Windows XP operating systems, lets you playback and manage a range of audio and video file types, including, of course, WMA and WMV.
DivX
It is video encoding technology, released by company called DivXNetworks. The DivX codec is based on the MPEG-4 compression standard. This codec is so advanced that it can reduce an MPEG-2 video (the same format used for DVD or Pay-Per-View) to ten percent of its original size.
XviD
XviD is an ISO MPEG4 compliant video codec. It's not a product but an open source project which is developed and maintained by people around the world. XviD, like many other MPEG4 formats, can be played with certain MPEG4 compatible, stand-alone DVD/DivX/XviD players. Please click here for more information about Xvid.

Glossary 1 - DV, DVD, CSS, VOB, ISO, VCD, SVCD, XVCD, VHS, CD, CDA, DAT, DTS etc. Glossary 3 - AAC, M4A, M4P, OGG, MP3, ID3 Tag, WMA, WAV, OGG Vorbis etc.
Glossary 4 - NTSC, PAL, ASX, Region, Codec, Streaming, DR

 


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