What is MPEG-2 decoder and where I can find this to download?

Answer 1

MPEG-2 is a standard for "the generic coding of moving pictures and associated audio information [1]." It is widely used around the world to specify the format of the digital television signals that are broadcast by terrestrial (over-the-air), cable, and direct broadcast satellite TV systems. It also specifies the format of movies and other programs that are distributed on DVD and similar disks. The standard allows text and other data, e.g., a program guide for TV viewers, to be added to the video and audio data streams. TV stations, TV receivers, DVD players, and other equipment are all designed to this standard. MPEG-2 was the second of several standards developed by the Motion Pictures Expert Group (MPEG) and is an international standard (ISO/IEC 13818).

If you mean to play a DVD, then try these sites.

http://www.cliprex.com/
http://www.avsmedia.com/DVDPlayer/index.aspx
http://www.snapfiles.com/get/avsdvd.html