Updated April 10, 2017. In grammar, a demonstrative is a determiner or a pronoun that points to a particular noun or to the noun it replaces. There are four demonstratives in English: the near demonstratives this and these, and the far demonstratives that and those. This and that are singular; these and those are plural.
In the context of video compression, codec is a concatenation of encoder and decoderâa device that only compresses is typically called an encoder, and one that only decompresses is a decoder. The compressed data format usually conforms to a standard video compression specification.
Codecs are important in the Windows Media Player world because you need a codec to translate different kinds of media files into data that WMP can understand. A codec (short for coder-decoder or compressor-decompressor) is a small program that converts data from one form to another.