What are Codecs? Codecs are ways of how to compress a movie and how to see a compressed movie.
You have downloaded a film and it won't play properly?
Then there is a useful tool called GSpot (http://gspot.headbands.com). This tool show you with which Codecs the movie you want to see was compressed.
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u can search in google to if u want
x.264 i recommend coreavc, if ya look hard enough ya can find it
thanks but my k-lite doing an excellent work