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| File extension | .RA |
| Category | Audio File |
| Description | RA is native RealAudio format for broadcasting streaming audio and video. It was created by RealNetworks in 1995. RA uses various audio codecs, including low bitrate formats for dial-up connection and high-quality music file types. It can be used as audio stream format for playing tracks while they are loading. A lot of online radio-stations used this format, while now it is pushed out by MP3, WAV and others. RA files can be zipped by a few codecs together for better file size. |
| Associated programs | RealNetworks RealPlayer |
| Developed by | Real Networks |
| MIME type | audio/vnd.rn-realaudio |
| Useful links | More detailed information on RA files |
| File extension | .MP3 |
| Category | Audio File |
| Description | MP3 is the most popular audio file type based on MPEG-1 Layer III compression. Its lossy algorithm was developed in 1991. MP3 codes the sound almost with the same quality, as CD (16-bit stereo), providing compression in size 1 to 10 from the original WAF or AIFF tracks. The quality of MP3 seriously depends on the bitrate. It can be 128 - 256 kbps. Higher bitrates are also supported, but they seriously increase the file size. It is supported by all modern hard- and software players. |
| Associated programs | RealOne WinAmp Windows Media Player iTunes |
| Developed by | Fraunhofer Institute |
| MIME type | audio/mpeg audio/MPA audio/mpa-robust |
| Useful links | More detailed information on MP3 files |
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