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POSox --multi-thread option: Split stereo wav file to 2 mono files Windows Line command
 

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  1. POSox --multi-thread option: Split stereo wav file to 2 mono files Windows Line command
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    <p>I've written a batch program in windows command-line to take a stereo wav file and split the right and left channel into separate FLAC files using sox v.14.4.0 audio program. Like so..</p> <pre><code>for /r %%n in (*.wav) do ( C:\sox\sox.exe %%n -c 1 %%n.left.flac remix 1 C:\sox\sox.exe %%n -c 2 %%n.right.flac remix 2) </code></pre> <p>However, this takes a bit longer than I'd like. I looked into this more and it appears that I can use SOX_OPTS and the --multi-thread option along with --buffer in order to perform two sox operations at the same time. </p> <p>The Sox documentation states this:</p> <p>The SOX_OPTS environment variable can be used to provide alternative default values for SoX’s global options. For example:</p> <pre><code>SOX_OPTS="−−buffer 20000 −−play−rate−arg −hs −−temp /mnt/temp" </code></pre> <p>Note that the way to set environment variables varies from system to system. Here are some examples: MS-DOS/MS-Windows:</p> <pre><code>set SOX_OPTS=−V −−no-clobber −−buffer BYTES, −−input−buffer BYTES </code></pre> <p>Set the size in bytes of the buffers used for processing audio (default 8192).<br> −−buffer applies to input, effects, and output processing;<br> −−input−buffer applies only to input processing (for which it overrides −−buffer if both are given).<br> Be aware that large values for −−buffer will cause SoX to be become slow to respond to requests to terminate or to skip the current input file.</p> <p>Two questions.</p> <ol> <li>Is it possible to do split 1 input file to 2 output files simultaneously using --multi-thread as explained above or another way? </li> <li>If so, how? (note: I haven't been able to figure out the correct syntax to get SOX_OPTS from the documentation above to work on it's own never mind in a batch file)</li> </ol> <p>Also: I've found some other stackoverflow questions similar to this but always using java, php, linux, etc. Unfortunately, I don't have any knowledge of those programs. Please be sympathetic of my programming ignorance.</p>
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