Re: split stereo by channel and silence

On 2017-06-27 01:07, jlnichols wrote:
> i have stereo wav files, which each channel is different speakers in a
> conversation.  trying to figure out how best to split a stereo file by 
> both
> its channel and silence, but still know the order the files should be 
> played
> in to hear the conversation has a whole.

If you leave it as a stereo file and split by silence you'll get a 
sequence of
smaller files in play order, divided up whenever neither person is 
talking.  So
essentially

    both001.wav
    both002.wav
    both003.wav

(for that your sox command is going to have to contain: "both%3n.wav" I 
think,
though you might need %5n or %7n or something if there's going to be a 
huge
number of these files created).

Most of these files should only have one person speaking in them, but 
clearly
there's going to be some with both.


I'd then run the sox  stats  effect on each of those files, piping the 
output
into a script/program.  Stats tells you the sound level in each channel 
of a
file.  You'd need (by experiment, probably) to find out for yourself 
what the
levels are in a file where one or other person is silent.  It should 
then be
possible for your script/program to decide if that stereo file contains 
only
the left channel person speaking, or only the right, or both.

I would use that info to rename each of the 'both' files, so eg

    both103.wav

could become

    voice103L.wav  or  voice103R.wav  or  voice103B.wav

Then you'd have a set of files like

    voice001L.wav
    voice002L.wav
    voice003R.wav
    voice004L.wav
    voice005L.wav
    voice006B.wav
    voice007L.wav
    voice008R.wav
    voice009L.wav
    ...

To listen to just the lefthand person, you'd want to copy the files with 
"L" and "B"
in their names elsewhere, to get:

    voice001L.wav
    voice002L.wav
    voice004L.wav
    voice005L.wav
    voice006B.wav
    voice007L.wav
    voice009L.wav
    ...

To listen to just the righthand person, you'd want to copy the "R" and 
"B" files:

    voice003R.wav
    voice006B.wav
    voice008R.wav
    ...

To listen to the whole thing with both people, just listen to the whole 
'voice' set of
files.


Now, if you think about the "just lefthand person" COPY of the 
voicennnx.wav files, ie:

    voice001L.wav
    voice002L.wav
    voice004L.wav
    voice005L.wav
    voice006B.wav
    voice007L.wav
    voice009L.wav
     ...

obviously although these files contain all of the left person's 
contributions to the
discussion, the "B" files do also contain the right person interrupting. 
  If that was
annoying then ON THIS SET OF COPIED FILES ONLY you could run on each of 
the B files
the command like:

   sox voice006B.wav voice006L.wav remix 1

to get a left-channel only copy of what was in the B file.  So then 
you'd have

    voice001L.wav
    voice002L.wav
    voice004L.wav
    voice005L.wav
    voice006B.wav        chunk 6, both people
    voice006L.wav        chunk 6, left person only
    voice007L.wav
    voice009L.wav
     ...

and you could delete this copy of the voice006B file if you were sure 
you didn't need
it.


Does that help?


-- 
Jeremy Nicoll - my opinions are my own

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