ENCODE\/DECODE

T&F
When we discuss “encode” in media, it often contains two parts, video encoding and audio encoding.
Video encoding is one of those important steps in a video that will determine whether the image output looks good or bad. The technical
term for this process is “encoding” but is often referred to as “conversion”.
Not all video is the same. Digital video can exist as any number of formats, using any numbers of settings. When a digital video file does not meet the specifications, or the file type is bad for the intended use, it must be converted to the proper format, using video encoder hardware or software.
The word “format” is used for many things in video, but it tends to confuse people for this very reason. So let us clarify some definitions real quick;
Video format: this includes file types, like MPEG-1(MPG), MPEG-2
(MPG),Quicktime(QT),RealMedia(RM,RMVB),Windows Media(WMV),
H.264(MP4),Divx and Xvid(AVI),FlashVideo(FLV),ect.
Playback format: This refers to final product used when viewing the video. Examples include DVD-video (DVD), VideoCD (VCD), streaming video (Youtube,Flash)
Video Specifications: For example, DVD-Video specification uses MPEG-1 or MPEG-2 with certain resolutions and settings only any old
MPEG-1 or MPEG-2 will not suffice.
When encoding video, you must consider (1) the original source and capture methods, (2) any later encodes that performed, (3) the intend output. Only by analyzing those aspects, and then considering
all the options, can a high quality encode be performed. Converting video properly is not s simply a matter of pressing the “GO” button in
an encoder program.
The Encoding class names the specific type of data representation used for an audio stream. The encoding includes aspects of the sound format other than the number of channels, sample rate, sample size, frame rate, frame size, and bite rate, audio codec.
Like video codec, audio codec are algorithms by which an audio stream is encoded. Like video codec, there are lossy and lossless audio codec.
There are lots of audio codecs: MPEG-1 Audio Layer 3 ,Advanced Audio Coding ,Windows Media Audio, Vorbis ,Dolby Digital ,Digital Theater System. One concept that audio has that video does not is channels. We’re sending sound to your speakers, right? Well, how many speakers do you have? If you’re sitting at your computer, you may only have two: one on the left and one on the right. My desktop has three: left, right, and one more on the floor. So-called “surround sound” systems can have six or more speakers, strategically placed around the room. Each speaker is fed a particular channel of the original recording. The theory is that you can sit in the middle of the six speakers, literally surrounded by six separate channels of sound, and your brain synthesizes them and feels like you’re in the middle of the action. Does it work? A multi-billion-dollar industry seems to think so. Most general-purpose audio codecs can handle two channels of sound. During recording, the sound is split into left and right channels; during encoding, both channels are stored in the same audio stream; during decoding, both channels are decoded and each is sent to the appropriate speaker. Some audio codecs can handle more than two channels, and they keep track of which channel is which and so your player can send the right sound to the right speaker.

Audio and video glossary. 2014.

Look at other dictionaries:

  • decode — v. t. to convert from a coded form into the original form; of communications. Inverse of encode. Syn: decrypt, decipher[WE1]. [PJC] …   The Collaborative International Dictionary of English

  • encode — verb a) To convert plain text into code. b) To convert source information into another form. Ant: decode See Also: code, codec, decode, re encode …   Wiktionary

  • Decode-Encode Language — The Decode Encode Language (DEL) is a networking protocol designed by Jeff Rulifson to transmit user input from consoles or terminals, and receive display information from remote terminals. External links http://www.ietf.org/rfc/rfc0005.txt This… …   Wikipedia

  • decode — de|code [ˌdi:ˈkəud US ˈkoud] v [T] 1.) to discover the meaning of a message written in a ↑code (=a set of secret signs or letters) = ↑decipher 2.) if a computer decodes ↑data, it receives it and changes it into a form that can be used by the… …   Dictionary of contemporary English

  • encode — [[t]ɪnko͟ʊd[/t]] encodes, encoding, encoded VERB If you encode a message or some information, you put it into a code or express it in a different form or system of language. [V n] The two parties encode confidential data in a form that is not… …   English dictionary

  • decode — UK [diːˈkəʊd] / US [dɪˈkoʊd] verb [transitive] Word forms decode : present tense I/you/we/they decode he/she/it decodes present participle decoding past tense decoded past participle decoded 1) to succeed in understanding the meaning of a message …   English dictionary

  • encode */ — UK [ɪnˈkəʊd] / US [ɪnˈkoʊd] verb [transitive] Word forms encode : present tense I/you/we/they encode he/she/it encodes present participle encoding past tense encoded past participle encoded 1) to put secret information into code (= a system of… …   English dictionary

  • Decode (semiotics) — Semiotics General concepts Biosemiotics · Code Computational semiotics Connotation&# …   Wikipedia

  • decode — verb a) To convert from an encrypted form to plain text. The cryptographer decoded the secret message and sent the result to the officer. b) To figure out something difficult to interpret. I finally managed to decode the nearly illegible doctors… …   Wiktionary

  • decode — verb (T) 1 to discover the meaning of a secret or complicated message: a computer that can decode and implement complex instructions. 2 technical to understand the meaning of a word rather than use a word to express meaning opposite encode …   Longman dictionary of contemporary English

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