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MPEG-1 is very common, mainly due to its ability to store an entire film on a single CD. This Video CD format is a

mass-market competitor to VHS in countries where high humidity can quickly degrade magnetic tapes.

MPEG-2

MPEG-2 is the designation for a group of audio and video coding standards agreed upon by MPEG (Moving

Picture Experts Group). MPEG-2 video is not optimized for low bit-rates (less than 1 Mbit/s), but outperforms MPEG-

1 at 3 Mbit/s and above.

MPEG-2 is typically used for standard definition DVDs (maximum average of 9.8 Mbit/s) and television broadcasts

(commonly a lower bit rate than DVD).

Some High-Definition files are also coded using MPEG-2, and higher bit rates do exist.

MPEG-4

MPEG-4 is the designation for a group of audio and video coding standards agreed upon by MPEG (Moving

Picture Experts Group).

In general, MPEG-4 video will look more natural than MPEG-2 at the same bit rate (all else being equal). This has

made it an incredibly popular format for bandwidth-sensitive applications such as online steaming, web downloads

and television broadcasting.

WMV9/WMVHD/VC-1

Windows Media Video (WMV) is a generic name for the set of proprietary streaming video technologies developed

by Microsoft. It is a non-standard version of MPEG-4 Part 2. WMVHD is a new addition to the technology that adds

High Definition resolutions. VC-1 is an informal name for the draft SMPTE standard 421M codec which is a superset

of WMV-9 and WMVHD.

DivX™ and XviD

DivX and XviD uses MPEG-4 Part 2 compression. They are popular because their codecs (software to compress the

video and audio) are made available without charge.

Quality can be as good as MPEG-4, but it is common for already compressed files to be recompressed with these

codecs, resulting in further loss of image quality.

Common file extensions* .avi