Upsampling MQA files to original resolution with sox

[Alandbush]

(14-05-2020 12:57)granosalis Wrote:  

(14-05-2020 11:39)Alandbush Wrote:  I've tried the following command successfully on a 16bit MQA/CD track downloaded from 2L. It appears 'listenable'.

sox -S input.mqa.flac -b 24 output.flac rate -v -s -M 352800

nb - I have also introduced an extra override (-s 'steep filter'). If only because the command now looks very similar to the originally posted command.

I have a clip warning and the result of the trasnformation is just noise.

C:\Program Files (x86)\sox-14-4-2>sox -S -b 24 "C:\Users\giuse\home\02 traccia02.wav" C:\Users\giuse\home\Traccia02.flac rate -v -s -M 352.8k
sox WARN wav: User options overriding size read in .wav header

Input File : 'C:\Users\giuse\home\02 Traccia02.wav'
Channels : 2
Sample Rate : 44100
Precision : 24-bit
Duration : 00:02:53.34 = 7644392 samples = 13000.7 CDDA sectors
File Size : 45.9M
Bit Rate : 2.12M
Sample Encoding: 24-bit Signed Integer PCM

In:100% 00:02:53.34 [00:00:00.00] Out:61.2M [ -==| ] Hd:0.0 Clip:7.31M
sox WARN rate: rate clipped 4871455 samples; decrease volume?
sox WARN sox: `C:\Users\giuse\home\Traccia02.flac' output clipped 2437165 samples; decrease volume?
Done.

The command I used changed the bit rate of the output file.
Your command changes the bit rate of the input file and presumably results in your reported issue.