The Moving Picture Experts Group (MPEG) is a group of experts formed by ISO (International Organization for Standardization) and IEC (International Electrotechnical Commission). Experts from MPEG primarily set standards for audio and video compression and transmission. MPEG has standardized a number of compression and ancillary standards. MPEG2 and MPEG4 are two such standards. MPEG4 is a newer and more advanced version than MPEG2. MPEG4 incorporates a number of new video and audio standards and therefore is more used than MPEG2. This article consists a comparison of these two standards of MPEG:
MPEG2 includes transmission and compression methods of generic coding of over-the-air, cable as well as satellite television.
MPEG4 is an advanced standard of MPEG and includes methods of coding audio-visual objects. MPEG uses advanced coding tools and has higher compression factor than MPEG2. MPEG4 has more coding efficiency than MPEG2.
This is used for transmission of audio and video for quality television broadcasts. It also supports high definition content.
This includes a number of features of MPEG2. It is used for compression of AV data for web, CD distribution, voice and television broadcasts applications.
This compression scheme is used for over-the-air digital television from Dish Network, DirecTV and many other TV services.
This can be used for over-the-air television. However it is not used for the purpose.
This is used for DVD-video. But this standard imposes certain restrictions in terms of dimensions, aspect ratio(4:3, 16:9), audio-video bitrate(max 9 Mbit/s) etc.
This is used on DVD, HD-DVD and works better than the other. It is efficient across a variety of bit-rates ranging from a few kilobits per second to tens of megabits per second.
This can be used on Blue-ray Discs. But MPEG4 is mostly used as it is better than other one.
For HD video and Blue-ray Discs transmission, This standard is predominantly used. DirecTV and Dish Network of United States use MPEG4 standard for the purpose.
It is not used in transmission of 3D video.
It is used for transmission of 3D video. Apart from this, it is effectively used in animation graphics, digital television, World Wide Web and their extensions. DirecTV transmits 3D content using this MPEG standard.
It is not used in Digital Right Management signaling.
It supports Intellectual Property Management and Protection (IPMP), which provides the facility to use proprietary technologies to manage and protect content such as digital right management.
Another thing, this technology does not supports multimedia applications such as Java application.
But this also supports Java application and the like.
In DirecTV, high definition content sent on two digit channel numbers use MPEG2. MPEG2 can transmit HD content but has many restrictions.
In DirecTV, HD channels above 100 and PPVs uses MPEG4 technique. MPEG4 is more effective than MPEG2 in transmission and compression of HD video and audio.