I think you'd be on to something! The for-loop probably calls sox
at each loop and causes some issues.
However, if I run
sox --combine merge *.WAV merged.wav
or write to a different directory, it still merged everything
into the last file in the list and it creates a new
file.
So, I have files labelled 1.wav ... 90.wav Each are 1 minute
long. When running the merge command, the last file in the list
becomes the one everything is merged into, and ends up having 89
channels and not 90. The new merged.wav ends up being 8 seconds
long, yet have 178 channels, ie 89 x2. So somewhere along the line
the loop is doubled, and I cannot understand how.
/* Ulf A. S. Holbrook post@xxxxxxxxx http://www.u-l-v.org/ +47 99569230 */
On 15/10/2023 22:39, Jeremy Nicoll - ml
sox users wrote:
On 2023-10-15 14:27, Ulf A. S. Holbrook via Sox-users wrote:
Hello!
I'm trying to combine a large amount of files into one single file and wondered if someone could lend a hand. I have individual folders of 90 1-minute files in .wav and want to merge them into one 90-channel file. I'm running
for file in /dir
do
sox --combine merge *.WAV >> merged.wav
done
I am guessing here ... and if that's a linux shell command I don't know if
it evaluates *.WAV just once or more than once. It's also not clear to me
if you delete merged.wav between experiments.
I've never seen an example sox command that uses redirection to place output
in a result file, so wonder if what's (not) being written there is progress
or error messages rather than audio data? Perhaps
sox --combine merge *.WAV merged.wav
or
sox --combine merge *.WAV \anotherdir\merged.wav
would work better.
It looks to me as if your code runs sox many times. Why not run it just
once reading all the input files in one operation?
If multiple runs ARE needed, does it work when the source directory only
contains one file? Or two files? Can you make a copy of the generated
file each time - NOT in the same directory, so there's no risk of it being
matched by the "*.WAV" if that pattern is matched multiple times? - and
examine each run's output to see what it actually contains (eg with the
stats effect)?
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