K-Lite codec Pack (encoding and decoding)

And codec pack, probably the most popular by far (it is known for many years now). It should be careful when you install it, and pay attention to unnecessary codecs, because they are rare cases of conflicts between codecs. Remember that the version of the K-Lite Mega Codec Pack includes Real Alternative and QuickTime Alternative.

If you can, I suggest you use Vista Codec Package or Divx Total Pack, which created fewer conflicts; I suggest K-Lite Codec Pack if you need codecs rare and rare.

K-Lite codec Pack