mp3, wma, avi, rm, rmvb, flv, mpg, mov, mkv, etc.

1. mp3

MP3 is an audio compression technology, its full name is Moving Picture Experts Group Audio Layer III (Moving Picture Experts Group Audio Layer III), referred to as MP3. It is designed to significantly reduce the amount of audio data.

Using MPEGAudioLayer3 technology, music is compressed into smaller files with a compression rate of 1:10 or even 1:12. For most users, the playback sound quality is the same as the original uncompressed file. There is no noticeable drop in audio.

It was invented and standardized in 1991 by a team of engineers at the Fraunhofer-Gesellschaft, a research organization in Erlangen, Germany. Music stored in MP3 format is called MP3 music, and a machine that can play MP3 music is called an MP3 player.

2. wma

WMA (Windows Media Audio) is a new audio format launched by Microsoft that is as famous as the MP3 format. Because WMA exceeds MP3 in terms of compression ratio and sound quality, and is far better than RA (RealAudio), it can produce better sound quality even at a lower sampling frequency.

Generally, files using the WindowsMediaAudio encoding format have WMA as the extension. Some pure audio ASF files that use the WindowsMediaAudio encoding format to encode all their contents also use WMA as the extension.

3. avi

AVI’s full English name is AudioVideoInterleaved, which is the audio and video interleaved format. It is a multimedia container launched by Microsoft in November 1992 as part of its Windows video software. Format.

AVI files contain audio (voice) and video (image) data in a file container, allowing simultaneous playback of audio and video.

Similar to the DVD video format, AVI files support multiple audio and video streams. AVI information is mainly used on multimedia discs to save various image information such as TV and movies.

4. rm

RM format is a streaming video file format developed by RealNetworks. It can formulate different compression ratios according to different rates of network data transmission, thereby achieving low rates. Real-time transmission and playback of video files on the Internet. It mainly contains three parts: RealAudio, RealVideo and RealFlash.

5. rmvb

RealMedia Variable Bit Rate (RMVB) is an extended version of the Variable Bit Rate (VBR) of the RealMedia multimedia digital container format developed by RealNetworks.

Relative to the more common streaming RealMedia container encoded at a fixed bit rate (CBR), RMVB is typically used for multimedia content stored locally. The extension for files using this format is ".rmvb".

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