1. Is a video codec
   Video codec
   A video codec is a device or software that enables video compression and/or decompression for digital video. The compression usually employs lossy data compression. Historically, video was stored as an analog signal on magnetic tape...
   
    created by Q-Team that uses run-length encoding
   Run-length encoding
   Run-length encoding is a very simple form of data compression in which runs of data are stored as a single data value and count, rather than as the original run...
   
   , interframe differencing and motion compensation
   Motion compensation
   Motion compensation is an algorithmic technique employed in the encoding of video data for video compression, for example in the generation of MPEG-2 files. Motion compensation describes a picture in terms of the transformation of a reference picture to the current picture. The reference picture...
   
    .
2. It was also a popular image viewer in the early 1990s, for the obsolete MS-DOS
   MS-DOS
   MS-DOS is an operating system for x86-based personal computers. It was the most commonly used member of the DOS family of operating systems, and was the main operating system for IBM PC compatible personal computers during the 1980s to the mid 1990s, until it was gradually superseded by operating...
   
   operating system.

External links

• US Patent 5825918, which describes QPEG compression algorithm.