The Moving Picture Expert Group has defined MPEG-4 as the default standard for current generation video compression. The older MPEG-2 format is still the most widely used standard due to it being an integral part of the DVD specification. Hardware players with MPEG-4 support are just starting to appear within the consumer marketplace, but this advanced standard has already enjoyed great success within the online community since a wide variety of software codecs and players are now available. All MPEG-4 codecs share a common specification, but the underlying code base can differ greatly among the different implementations. Accordingly, TechIMO is offering a comparison of several popular formats. Click on Read More... to see which codec's they used and a link to read the review Go here to read the review Used Codec's: Source Video 3ivx D4 4.0.3 DICAS mpegable v2 DivX 3.11 Fast DivX 3.20 by KS DivX Pro 5.0.3 Single Pass DivX Pro 5.0.3 Two Pass MS MPEG-4v3 VKI by KS REALmagic MPEG-4 v1.1 XviD 3-3-03 by Nic Single Pass XviD 3-3-03 by Nic Two Pass On2 VP3 3.2.5.0