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File extension.SPX
CategoryAudio File
DescriptionSPX (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 programsVLC media player
FFMpeg
Developed byXiph.Org Foundation, Jean-Marc Valin
MIME typeaudio/x-speex
audio/speex
Useful linksMore detailed information on SPX files

File extension.WMA
CategoryAudio File
DescriptionWMA 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 programsVLC media player
Developed byMicrosoft
MIME typeaudio/x-ms-wma
Useful linksMore detailed information on WMA files

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