File Formats There are several commonly used audio formats. There are fewer video formats, but the types of audio-video can be confusing. This is just a brief description of what the more commonly used file formats, audio and video systems.

AAC: Advanced Audio Coding This is an audio file format from Apple iTunes Store, and may seem m4a file extension. And 'better-quality MP3 audio. It was developed as part of the MPEG-4, owned by Dolby (see below).
AU: This audio file format is the standard used by Java, Sun and Unix.

MPEG: Moving Pictures Expert Group has several types of MPEG is now everywhere.

MPEG-1: Used in cameras and video camcorders to small clips. the DVD playback quality you would expect from MPEG-1.

MPEG-2: Used for digital satellite TV, video recording and professional recording DVD recording. providing multiple channels of surround sound recordings.

MPEG-3: MPEG-3 was proposed as an entity, but eventually merged into MPEG-2.

MPEG-4: This is the latter approach is used for MPEG and Internet streaming content. It is also used in portable video recorders and Internet downloads. DivX required. Improved digital broadcasting and interactive graphics and multimedia.

MP3 digital audio files, typically used to store audio and reading. It compresses files to about 10% of a normal audio file, and a normal piece of audio is about 5 to 6 MB in size. MP3 stands for MPEG-1 Audio Layer 3, not MPEG-3 as many think. A file type CD-quality MP3 audio next.

OGG: Support for audio files format a variety of codecs, the most popular of these is the audio codec Vorbis. However, MP3 files are much more widespread than support Vorbis.

RA: Real Audio format is designed for streaming audio over the Internet. This is a separate file format with all the audio information stored in the file itself.

WAV: The simplest audio file formats developed by Microsoft and IBM, and built-in Windows 95 This is an audio file format uncompressed file sizes are large (10 x MP3), and n did not need additional treatment to play. WAV file consists of three blocks of information: The RIFF block that identifies the file as a WAV file, the block format, which identifies parameters such as sample rate and data block that contains the actual data or sample audio.

WMA: Windows Media Audio digital system invented by Microsoft, and is used for portable digital players. Using the WMA files can be programmed so that it can not be copied, and can be used to protect intellectual property.

WMF: Windows Media Format These files are audio-video codecs including WMA. Offer high quality and safety of media streaming and download and play applications on computers.

WMV: Windows Media Video in Windows Media Player hand, is used to listen to and download and play audio and video.

In the case of audio and video formats, can be found from time to time the term "codec". Codec is simply an abbreviation encoder-decoder (or compressor - decompressor). The main task of the codec to compress the audio or video stream data so that samples of digital audio and video can be accelerated and reduced storage space.

The aim of all the codecs is to reduce the file size of at least keep the audio and video quality. Quickly grab the codec instead of the transmission and reception path: video capture card - - video device (video camera, for example) digital video - codec (digital compression information) - Result (MPEG2, AVI, WMV, etc) - the video images - - codec (uncompressed ) display device.

Between the two the result compressed codecs is transferred to the display device transmitted, stored in the folder, etc.) Therefore, to condense the flow even more, an essence, be described as follows: raw data - codec - transmit - codec - play

It's simple, but it shows how the codecs used. Therefore, to play a movie, video or piece of audio from a certain format, you need a codec on your computer so you can unzip the file and play it.

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