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Digital Video Platform
Glossary
 

MPEG-4

MPEG-4 is an ISO/IEC standard developed by MPEG (Moving Picture Experts Group), the committee that also developed the Emmy Award winning standards known as MPEG-1 and MPEG-2. These standards made interactive video on CD-ROM, DVD and Digital Television possible. MPEG-4 is the result of another international effort involving hundreds of researchers and engineers from all over the world. MPEG-4, with formal as its ISO/IEC designation 'ISO/IEC 14496', was finalized in October 1998 and became an International Standard in the first months of 1999. The fully backward compatible extensions under the title of MPEG-4 Version 2 were frozen at the end of 1999, to acquire the formal International Standard Status early in 2000. Several extensions were added since and work on some specific work-items work is still in progress. MPEG-4 builds on the proven success of three fields:
Digital television;
Interactive graphics applications (synthetic content);
Interactive multimedia (World Wide Web, distribution of and access to content)

MPEG-4 provides the standardized technological elements enabling the integration of the production, distribution and content access paradigms of the three fields, it designed specially for low-bandwidth (less than 1.5MBit/sec bit rate) video/audio encoding purposes.

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RTSP (Real Time Streaming Protocol)


The Real Time Streaming Protocol, or RTSP, is an application-level protocol for control over the delivery of data with real-time properties. RTSP provides an extensible framework to enable controlled, on-demand delivery of real-time data, such as audio and video. Sources of data can include both live data feeds and stored clips. This protocol is intended to control multiple data delivery sessions, provide a means for choosing delivery channels such as UDP, multicast UDP and TCP, and provide a means for choosing delivery mechanisms based upon RTP (RFC 1889).
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RTCP (Real Time Control Protocol), RTP (Real Time Protocol)


RTP, the real-time transport protocol. RTP provides end-to-end network transport functions suitable for applications transmitting real-time data, such as audio, video or simulation data, over multicast or unicast network services. RTP does not address resource reservation and does not guarantee quality-of- service for real-time services. The data transport is augmented by a control protocol (RTCP) to allow monitoring of the data delivery in a manner scalable to large multicast networks, and to provide minimal control and identification functionality. RTP and RTCP are designed to be independent of the underlying transport and network layers. The protocol supports the use of RTP-level translators and mixers.
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D1


So-called "full resolution" for TV specs. Normally D1 can mean one of the following video resolutions:
704x576 (TV PAL)
704x480 (TV NTSC)
720x576 (DVD-Video PAL)
720x480 (DVD-Video NTSC)
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CIF (Common Intermediate Format)


Back in history, this acronym's name comes from video conferencing tools in late 1980's and early 1990's. Nowadays the term CIF is used to mean specific video resolution:
352x288 in PAL
352x240 in NTSC
CIF is 1/4th of "full resolution" TV, also called as D1 and is best-known because VideoCD standard uses this resolution.
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QCIF (Quarter Common Intermediate Format)


Old video resolution name. 1/4 of CIF video resolution. Standard sizes :
176x144 (PAL)
176x120 (NTSC)
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CBR (Constant Bit Rate)


CBR stands for Constant Bit rate. Basically it is a term that describes how video or audio is encoded - constant bit rate means that the bit rate doesn't vary during the video or audio at all, but is same through the clip. CBR bit rates are very easy to use in calculations -- if you have an MP3 file that has CBR of 128kbit/sec and it lasts for 3 minutes, the amount of HDD space it takes can be calculated easily:

128kbit = 128 x 1024 bits
1 byte = 8 bits
1 kilobyte = 1,024 bytes
1 megabyte = 1,024 kilobytes
3 minutes = 180 seconds
180 x 128 x 1024 / 8 / 1024 / 1024 = 2.81MB
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VBR (Variable Bit Rate)


As opposed to CBR, the bit rate is variable.

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