MPEG Dictionary
Mpeg entry
MPEG stands for Moving Picture Experts Group, is the name of familly of standards (joint of the International Organization for Standardization [ISO]) used for coding audio and video data in a digital compressed format including data transmission across digital networks. MPEG Video files have the .mpg or .dat extension and MPEG Audio files generally have the extension .mp1, .mp2, .mp3. MPEG is cross-platform compatible and can be played on all popular computer systems. The major advantage of MPEG compared to other video and audio coding formats is that MPEG files are much smaller for the same quality (eg, mp3 size is about 1:10 compared to Audio CD). This is because MPEG uses very sophisticated compression techniques.
MPEG4 is pretty much a collection of standards defined by the MPEG Group, and it should become the next standard in digital video (mainly for picture phones, streaming media on the Internet and more). MPEG4 allows the use of different encoding methods, for instance a keyframe can be encoded using ICT or Wavelets resulting in different output qualities.
MPG can be either an abbreviation for MPEG or is used as a file extension for MPEG-1 and MPEG-2 video data.
MM4 Multiple MPEG 4: A combination of different bitrate encoded files. For instance you could take a 2000kbit/s encode, a 910kbit/s encode and combine the files together, use the lower bitrate file and replace scenes where the quality gets too bad due to a lot of action with the parts taken from the 2000kbit/s one. It also includes the use of both DivX codecs: You can combine DivX low motion and DivX high motion files (and once again you can choose different bitrates). |
