10 Nov
2020
10 Nov
'20
1:12 a.m.
On Sat, November 7, 2020 1:04 am, John Murphy wrote:
On Fri, 6 Nov 2020 15:19:22 -0600 "Chris
Caudle" wrote:
That is different than the results on my system, even though I used the
same SoX command line you showed before. I don't know if that implies
some difference between versions of SoX, or different compile time
options, or different versions of sndfile-lib installed on my system
(Fedora 33 just for info).
sox-14.4.2.0-29.fc33.x86_64
libsndfile-1.0.28-13.fc33.x86_64
I am a bit surprised that change gain would be a default behavior,
definitely not what I would expect from just attempting to change the file
format.
--
Chris Caudle
What does sndfile-info show about t1w64.w64 and
t2wav.wav files? I
tried
using sox to convert a float file I had in an Ardour project directory
to
PCM, and sndfile-info reported the exact same maximum value for both.
Using the sox stat effect also displayed the same maximum and minimum
for
original and converted file as well, but sndfile-info might give you
some
insight into why sox did not seem to show the same value.
Side by side for easy comparison:
File : t1w64.w64 t2wav.wav
Length : 3840136 1920044
riff : 3840136 1920036
wave
fmt : 40 16
Format : 0x3 => WAVE_FORMAT_IEEE_FLOAT 0x1 => WAVE_FORMAT_PCM
Channels : 2 2
Sample Rate : 48000 48000
Block Align : 8 4
Bit Width : 32 16
Bytes/sec : 384000 192000
fact : 32
frames : 480000
data : 3840024
End
-----------------------------------------------------------------------
Sample Rate : 48000 48000
Frames : 480000 480000
Channels : 2 2
Format : 0x000B0006 0x00010002
Sections : 1 1
Seekable : TRUE TRUE
Duration : 00:00:10.000 00:00:10.000
Signal Max : 0.584686 (-4.66 dB) 32767 (-0.00 dB)
That last 'Signal Max' comparison does seem to confirm that
normalisation has occurred.