On 09/11/2022 16:54, Måns Rullgård wrote:
Sean Hurley <debrebeuf01@xxxxxxxxx> writes:
Heya,
I'm a newbie to sox, and I've recently been using it to trim, append, and
normalize PCM audio. Those functions work fine (I have removed those
specific parameters in the command below since my issue persists without
them).
However, when I try to save my file as 32 bit float, the audio is truncated
to 24 bit int. Even if I have no parameters and just input output a 32f
file, the audio is truncated to 24 bit int. Here's the command, where
in.wav is a 32 bit float file with content more precise than 24 bit int:
sox "in.wav" "out.wav"
To be clear, the output file IS a 32 bit float file, but the audio is
truncated to 24 bit. I also tried specifying 32 bit float in the command,
but no change.
SoX uses integer representation of samples internally regardless of what
the source format was. If a floating-point input contains sample values
that can't be represented as integers, they will be clipped or rounded.
See this bug entry: https://sourceforge.net/p/sox/bugs/317/
Just curious - SoX has various filtering capabilities - including
biquads, FIR, etc - see e.g. here: https://www.mankier.com/1/sox . So,
when filters are applied, what kind of arithmetic is used - integer 32
bits, floating point 32 bits, floating point 64 bits, something else ?
Thanks,
Sergei.
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