> > > > The header <speex/speex_types.h>, included in speexdsp.c,
> > > > in not even installed by speexdsp; this file is installed
> > > > by speex, and is irrelevant to the speexdsp effect.
> > >
> > > In fact
> > > speexenc audio.wav audio.spx
> > > sox audio.spx audio2.wav
> > > says
> > > sox FAIL formats: no handler for file extension `spx'
> >
> > That has nothing to do with the above.
> >
> > The speex _format_, as in https://speex.org/,
> > is not supported by SoX at all.
> That surprises me.
That can only surprise you if you haven't read soxformat(7),
the manpage SoX ships for exactly that, or formats.h,
a code listing of the supported formats.
> Is it by choice for some reason
Doesn't matter at all. Speex was never supported by SoX,
and it makes no sense to add it now if the authors of
speex itself say opus (by the same authors) supercedes it.
> or just not yet like M4A?
m4a _was_ kinda supported at one point, via calling ffmpeg.
That is long gone, thank god.
Jan
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