Often, this type of compression is virtually indistinguishable from the original uncompressed sound or images, depending on the codec and the settings used. They reduce quality in order to maximize compression. The decreasing cost of storage capacity and network bandwidth has a tendency to reduce the need for lossy codecs for some media. Using more than one codec or encoding scheme successively can also degrade quality significantly. This is especially true if the data is to undergo further processing (for example editing) in which case the repeated application of processing (encoding and decoding) on lossy codecs will degrade the quality of the resulting data such that it is no longer identifiable (visually, audibly or both). If preserving the original quality of the stream is more important than eliminating the correspondingly larger data sizes, lossless codecs are preferred. Lossless codecs are often used for archiving data in a compressed form while retaining all information present in the original stream. Compression codecs are classified primarily into lossy codecs and lossless codecs. In addition to encoding a signal, a codec may also compress the data to reduce transmission bandwidth or storage space. Further information: Image compression, Video coding format, and Audio coding format
0 Comments
Leave a Reply. |