What Is a Codec?

A codec is a device or program that can transform a signal or a data stream. The transformation referred to here includes the operation of encoding a signal or data stream (usually for transmission, storage, or encryption) or extraction to obtain an encoded stream, as well as the observation or processing to restore a form suitable for observation or operation from this encoded stream. Operation. Codecs are often used in applications such as video conferencing and streaming media, and are usually mainly used in the broadcasting industry for front-end applications.

The encoded original stream of audio or video is often called "Essence" (translated as "ontology", "fine") to distinguish it from the meta-information of the added stream and other to help access the stream and enhance the stream

H. The codec defined by 261 is composed of a source encoder, a video composite encoder, and a transmission buffer.

Codec lossy codec

Many relatively popular codecs in the software world are lossy, meaning that their compression process sacrifices some quality. Usually this kind of compression is virtually no different from uncompressed sound or image. Smaller data sets ease the relatively expensive memory. Lower data rates also reduce costs and improve quality during data transmission.

Codec lossless codec

There are also many lossless compressions, especially for obtaining data in compression mode when all the information in the original stream is needed. If preserving the original quality of the data stream is more important than cutting the correspondingly larger data, then lossless compression is better. Consecutive use of multiple codecs or encoding systems can also significantly reduce quality. Declining storage space overhead and network bandwidth are reducing the need for lossy compression.