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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.MP4
CategoryAudio File
DescriptionMP4 files can contain video and sound data. It is a file container that supports different multimedia content types such as multiple audio streams, subtitles, 2D and 3D image frames. MP4 is also used for streaming media services (online or digital TV). This file type supports the control of transmission speeds for media signal, as well as correcting corrupted frames. Thanks to comparatively low system requirements, MP4 is now the most popular container type for sharing media.
Associated programsApple QuickTime Player
Apple iTunes
Microsoft Windows Media Player
VideoLAN VLC Media Player
Developed byMoving Picture Experts Group
MIME type
Useful linksMore detailed information on MP4 files

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