what are and which are the most important

Over time, each video and audio codecs and codecs evolve, usually providing higher high quality or greater compression permitting each playback and enhancing to be completed extra simply and comfortably.

What are codecs

Codec is brief for “encoder – decoder” and is the program that compress and decompress an audio or video file. Let’s say that it’s the system, the algorithm, that decides how the information is compressed when it’s saved to a storage unit and how it’s decompressed when it’s performed again. This course of assumes that the audio and video information occupy roughly house and at the identical time preserve an optimum (or a minimum of adequate) high quality of replica. They are typically utilized in video calls and reside broadcasts to compress the sign when transmitting over the Internet and decompress it in the playback tools.

Each one compresses the info otherwise, the better the discount, the sooner the transmission on the community or between bodily storage items. As lack of info doesn’t need to suggest lack of high quality to the identical diploma, the greatest ones are those who restrict the measurement of the information with out producing too noticeable a lack of perceived high quality.

Difference between codec and format

It is regular for us to confuse the phrases codec and format, it may be stated that it’s ordinary. To put it merely, the format is the construction the place all the info is saved to form the file.

A Format musical permits the file to be performed on particular gamers or gadgets, nevertheless it additionally homes the audio file, which is chargeable for encoding and decoding the sound (compressing it in storage and decompressing it for playback).

The identical occurs with codec Video, is the program that compresses the picture with roughly loss, it’s immediately chargeable for the decision supplied by a video at the time of playback.

Characteristics and significance of codecs

Each one compresses the info in a manner that then makes it doable to supply higher or worse high quality in the replica. The identical occurs with the weight of that info, the greater the compression, the decrease the weight of the information and the greater the transmission pace by means of the community.


In the case of audio codecs, they are often divided between methods lossy or lossless. Compressions with losses They are primarily based on the listening to capability of the human being. When compressing an audio file, they get rid of frequencies that the human ear can’t understand (under 20 Hz and above 20 OkHz. They additionally filter the quantity of noise to supply solely what is perceptible to us in every frequency vary. They are normally the most used since they proceed to supply excessive sound high quality whereas taking on a lot much less house.

Depending on the service for which they are for use, greater or decrease ranges of discount are used. When it involves reside broadcasts, compression is normally greater, as is the case with telephony, podcasting or web radio stations. Those who provide no losses They provide greater audio high quality and are extra generally used for audio enhancing, they are additionally normally heavier as they provide a decrease diploma of content material discount.


As with audio codecs, video information are additionally tablets at the time of enhancing and exporting them in the chosen format in order that later, every participant or gadget can decompress it throughout playback.

The MPEG codec They are broadly used since the look of its first model. The first model supplied issues when reproducing it because it wanted excessive necessities for it. MPEG-Four on the different hand additionally compresses the audio and the picture providing a very good high quality of replica with a excessive diploma of compatibility. Currently, the H.264 o MPEG-Four AVC is the most widespread for its excessive stage of compression with minimal high quality losses, which permits clean video transmission at excessive decision.

Most important audio codec

Although the codec par excellence has been the MP3 that everyone knows, there are others which have additionally had their share of recognition and use, particularly in podcasting and music streaming purposes.


It was created by ISO / IEC MPEG Audio Committee in 1993, just some years earlier than the Internet music obtain increase. It may be thought of as the first compressed audio format that gained reputation worldwide.

At the finish of the 90s and the starting of the 2000s, all of us had MP3 gamers with 32 MB, 64 MB or 128 MB capability, and that’s {that a} tune may occupy between 3 and 6 megabytes. The supported bitrate (the KB per second that it’s able to reproducing) could also be between 8 Kbps and 320 Kbps. The most well-known limitation of MP3 is that it isn’t multichannel.

mp3 codec


It is the algorithm designed by Microsoft. In the finish, each codecs and codecs could possibly be a option to popularize a model by attempting to determine it as the customary.

It was launched in 1999 for competes with MP3, though with little success. It has the chance of constructing a compression with or with out loss and the vary of Bitrate (bit fee) is bigger reaching as much as 768 Kbps. The Windows Media Audio encoder may be performed as much as Eight channels in the Pro model.

wma codec


Many of you’ll keep in mind him in the early days of music archives as a result of he was so widespread. The draw back is that didn’t assist compression and, though it supplied nice sound high quality, its information have been too giant and troublesome to govern at occasions. The audio high quality can be akin to that of any Music CD.

Developed collectively by IBM and Microsoft in 1991 It was meant to retailer music and audios on the PC. All Windows 95 sound results have been WAV encoded in .WAV or .WAVE information.

wav codec


In the battle to impose every model its personal ecosystem or manner of creating new applied sciences, Manzana designed the AIFF (Audio Interchange File Format) audio encoder – decoder in 1988. It is the WAV of the Mac, it doesn’t compress the info and it affords CD high quality.

Most AIFF codecs work with the PCM format, though this format can also be suitable with Windows. It is broadly used to work with information with out discount and when a top quality of replica is required, though the truth of not be compressed affords typical information switch limitations.

aiff codec


The MP3 builders launched the AAC codec 4 years after its launch. Compression is way greater, which facilitated transmission over the community with the bandwidths restricted to 56 Kbps of the time. However, the audio high quality left lots to be desired.

This format affords multi-channel playback (as much as 28 channels) and bit charges of as much as 529 Kbps.

aac codec


Developed by xiph.org Foundation in 2001 in Open Source, this encoder affords lossless compression and variable bit fee, that’s, it adapts to the kind of data providing an optimum fee always.

The proven fact that it has been developed in open supply makes it a really helpful codec for software program builders searching for an encoding that provides optimum high quality with satisfactory discount. Bitrate vary is 4 – 32 Kbps and helps as much as Eight channels.

flac codec

OGG Vorbis

This is one other encoder – decoder made in open supply by the identical group xiph.org and launched in 2000. It compresses the info by eliminating pointless information in order that facilitates its transmission, particularly efficient when taking part in again by way of related gadgets. Bluetooth.

It can also be not a really widespread system since the compression and high quality of MP3 and AAC have been extra environment friendly.

ogg vorbis codec

Most important video codec

Although in the 90s and 2000s the power was the distribution of music over the Internet, in the following a long time the video is the king format of audiovisual content material, so the improvement of codecs that supply excessive ranges of compression with adequate qualities has been important in recent times.


This video compressor normally works with the format MP4 and it’s considered one of the most widespread in the world as a result of it performs a good compression on the codecs providing top quality audio and picture decision.

It is similar to Quicktime’s MOV format however affords greater ranges of compression than facilitates transmission of information on the Internet.

mp4 logo

DivX and Xvid

These codecs have been the ones utilized in the replica of DVD motion pictures so the high quality supplied was very excessive. The first DVDs have been edited with DivX, this one compressed the information to have extra content material. Audio high quality was excellent as a result of compression solely affected video.

Subsequently, the Xvid encoder changed it, changing into considered one of the person’s most well-liked methods because it labored particularly properly with giant information providing a greater compression with comparable high quality.

divx codec


This is considered one of the most broadly used requirements at this time on account of the benefits and advantages it affords. It is the results of the collaboration between VCEG and MPEG the place a compression system was sought that may permit decrease transmission charges to earlier ones (MPEG-2 or MPEG-4) however sustaining the high quality and simplicity in the version.

Since the 12 months 2003 that was created at this time could be very widespread for streaming video on the internet or importing it to streaming platforms comparable to YouTube.

h.264 codec

HEVC / H.265

High Efficiency Video Coding, which additionally adopts the technical identify of H.265, is taken into account the successor to the earlier H.264 and it was launched in 2014. It is a system that provides the identical high quality and compatibility with the next diploma of compression than its predecessor.

It is the pure evolution that has led to the look of 4K and 8K resolutions, which wanted greater high quality with out growing the bandwidth wanted for reside broadcasts or streaming platforms an excessive amount of.

hevc codec


Encoder AOMedia Video 1 It got here out in 2017 as considered one of the video compressors that decreased information measurement by 30% on common with little affect on high quality. In addition, it’s developed in open supply, so it’s obtainable to anybody and is suitable with numerous gadgets and gamers.

Video streaming permits it to be streamed and performed at decrease bandwidths whereas sustaining a excessive stage of high quality, very appropriate for transmitting and publishing on social networks.

av1 codec