On 07 Sep 2017, at 17:51, Jan Stary <hans@stare.cz> wrote:

Trying to merge multiple mono and poly Wave files while piping (to add custom padding to each input file.)
Whatever I do, on input poly files the output channel order is totally unpredictable.

I’m using something like sox -M “| sox 3ch.wav -p pad 1” “|sox 5ch.wav” -b 24 output.wav
I would expect to get the same order of output as in the order of the input / pipe, but that does not happen.

I cannot reproduce this behaviour.

What version of SoX are you using?
Does it also happen with the current version

https://we.tl/4XNMXikv0J
Y:\sox-14-4-2\sox -M "| Y:\sox-14-4-2\sox J:\Torsten\tst\T72.WAV -p pad 0" "| Y:\sox-14-4-2\sox J:\Torsten\tst\T72.WAV -p pad 1" -b 24 J:\Torsten\tst\output.wav

The file has ch1 (a bit) static, ch2 silence, ch3 voice
On merge, the input tracks are reversed (but other files behave random.)

With my installation of SoX, running

$ sox -M "|sox T72.WAV -p pad 0" "|sox T72.WAV -p pad 1" output.wav

creates an output file with 6 channels, containing (in this order):

1 static
2 silence
3 voice
4 static
5 silence
6 voice

Hi Jan,
Yeah, that’s what I would expect :-)

so I still cannot reproduce your problem.
I also tried with the "-b 24" which should be irrelevant - no change.

Can you please also upload your output file?

Sure, here you go:
Download link 
https://we.tl/lRpO2tMTxu

I must say, I’ve only checked in Audacity, but I doubt that would matter...
Btw, I’ve only tested on Windows (7, but I doubt that will matter….)
Bouke

Jan


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