Audio format
What is a .spx file?
Speex, the open speech codec the Xiph Foundation built for voice calls before Opus existed. It adapts its bitrate to speech and runs on modest hardware, which is why older VoIP apps and games adopted it.
fileclay opens Speex but doesn’t write it
When to use Speex
- Best for
- Old VoIP recordings and games.
- Advantages
- Free and tuned for voice.
- Disadvantages
- Superseded by Opus.
Convert Speex files
Questions about Speex
Which formats can I convert SPX files into?
fileclay can write 19 formats from a SPX file, including MP3, WAV, M4A, OGG, AAC and FLAC. Pick any of them as the output format when you drop the file in.