What is MPEG (Moving Picture Experts Group)?

MPEG is a group of ISO and compression standards and Digital Video File Formats developed by the group. Usually, Video for Windows is a higher quality video standard than other formats such as Indeo and QuickTime.

What is MPEG (Moving Picture Experts Group)?

MPEG File Extension (.mpeg)

MPG or MPGE is a basic format that contains several audio and video tracks and even subtitles tracks. Depending on the characteristics of the audio and video, the MPG file contains a certain standard.

For CD support, the most popular MPEG1 formats are MPEG2, VCD for SVCD, and CVCD.

Region

NTSC is the American format while the PAL format is used in Europe as the MPG format depends on the geographical area in which it is used. However, there are also multi-zone devices that are compatible with both PAL and NTSC.

If a video in MPG format is 25 FPS, it should be converted to PAL format. If the video is 23.976 or 29.976 FPS, the NTSC format should be used.

Converting to the wrong format may cause audio/video sync breakdown or other issues.

The converted MPG video can be burned like a normal data CD. However, in order to be viewed on a desktop DVD player or portable device, it must be burned to the VCD standards listed in the table.

The structure of a VCD is very different from a general data CD, so special programs such as Nero must be used to burn VCDs.

Compression

MPEG algorithms compress information into small packets that can be easily transmitted and then decompressed.

MPEG provides high compression by only storing changes from one frame to another, rather than storing the entire frame.

The information of a video to be created is encoded using a technique called DCT (Discrete Cosine Transform).

Feature

MPEG uses low loss compression codecs using conversion codecs.

In low loss conversion codecs, samples from image and sound are broken down into small pieces.

Only the differences with these reconstructed images and some extra information needed to make the estimate are retained.

MPEG only normalizes the bitstream and format of the decoder. The encoder is not standardized in any sense, but there are reference applications such as VCD, MPEG2: DVD, MPEG3: HDTV, MPEG4: DIVX, XVID that generate valid binary streams for members.

Compression Formats

   MPEG1

It is the first standard for audio and video compression and provides video at a resolution of 352×240 at 30 frames per second (fps).

This produces a slightly lower quality of video than conventional VCR videos and includes the layer 3 (MP3) audio compression format.

   MPEG2

It is the audio and video standard for broadcast-quality television and offers resolutions of 720×480 and 1280×720 at 60fps in audio CD quality.

This is sufficient for most TV standards, including NTSC and even HDTV. MPEG2 is used for satellite TV and digital cable TV signals for you and can compress a 2-hour video to a few gigabytes.

Although decompressing an MPEG2 data stream does not require much computer resources, it does require significantly more power to process encoding into MPEG2 format.

   MPEG3

It was designed for HDTV but abandoned in favor of the MPG-2.

   MPEG4

MPEG1 is the standard graphics and video compression algorithm based on MPEG2 and Apple QuickTime technology.

Video files in MPEG4 format are smaller than JPEG or QuickTime files. So they are designed to transmit video images over a narrow bandwidth and they can mix the video with text, graphics, and 2D and 3D animation layers.

   MPEG7

MPEG7, officially called the Multimedia Content Definition Interface, provides a set of tools for multimedia content.

MPEG7 is designed to be generic and is not intended for a particular use.

   MPEG21

It includes a Rights Expression Language and a Rights Data Dictionary. Unlike other MPEG standards that describe compression and encoding methods, MPEG21 includes a standard that defines the description of the content as well as the operations related to access, search, storage, and copyright of the content.

It is important to note that there are currently three most used MPEG files by users because of the possibilities they offer.

It is MPEG1 typically used to create a video in VCD and CVCD. MPEG2 is used for DVD, SVCD, CVD, and for parameters of digital television.

It uses the MPEG4 format which is commonly used for videos in DivX and Xvid formats.

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