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| File extension | .SPX |
| Category | Audio File |
| Description | SPX (Speex) is an open-source CELP-based speech codec format intended for compressing speech at bitrates between 2 and 44 kbps. The .SPX extension has a number of advanced features, which ensure noise- and echo reduction, stereo encoding, integration of several sample rates within a particular bitstream, etc. Although SPX is patent-free, it is not widely supported by popular audio players. For this reason, most users prefer to convert SPX files to WAV or MP3. |
| Associated programs | VLC media player FFMpeg |
| Developed by | Xiph.Org Foundation, Jean-Marc Valin |
| MIME type | audio/x-speex audio/speex |
| Useful links | More detailed information on SPX files |
| File extension | .WMA |
| Category | Audio File |
| Description | WMA is a very common and widely spread audio file extension, being only second to MP3. It is regarded as an ultimate competitor for MP3, since it almost pars in sound quality with MP3 at comparable bitrates. WMA Pro is viewed as a professional version of WMA Standard, since it uses an advanced multichannel encoding pattern. Today, WMA Pro is on the way toward getting the status of a standard format for next generation DVD. WMA Lossless was designed for storing and archiving audiodata. WMA Voice is a low-bitrate version of the WMA codec used for storing speech data. |
| Associated programs | VLC media player |
| Developed by | Microsoft |
| MIME type | audio/x-ms-wma |
| Useful links | More detailed information on WMA files |
