Re: Audio processing

["Kerry Hoath" <kerry@gotss.net>]

You are not understanding sox's syntax from the manpage.

here is the quick and dirty which should hopefully make sense:
sox <in options> <input file> <out options> <output file> affect

so you want:
sox file1.wav -c2 file2.wav

This says read file1.wav with info in the header. the output options say I 
want 2 channels out; then write file2.wav with the same sample rate etc.
To make this verbose
sox -V file1.wav -c2 file2.wav

reversing a file (just to show an affect)
sox file1.wav file2.wav reverse

add an echo to a file but at the same time change channels from 1 to 2:
sox -V file1.wav -c2 file2.wav echo .5 .5

show stats on a file:
sox file1.wav -e stat

-e shows that the second file name is empty and just use the stat affect.

change the volume of a file after seeing the maximum from stat:

sox -V file1.wav -v 1.214 file2.wav


resample a file at 22050hz to 44100:
sox file1.wav -r 44100 file2.wav

Hope this helps a little.
ecasound is command-line driven and takes practice have not looked it yet.
Regards, Kerry.

----- Original Message ----- 
From: "Tony Baechler" <tony@baechler.net>
To: "Speakup is a screen review system for Linux." <speakup@braille.uwo.ca>
Sent: Sunday, June 15, 2008 5:45 PM
Subject: Audio processing


luke wrote:
> I do much audio processing with my system, and this is going to kill me
> (well, it won't--I'll revert to an old version of speakup, running on
> 2.6.18, but then I lose my USB sound card, and have to live with the on
> board one).
>



Hi,

What audio processing tools are out for Linux and are accessible?  I'm
aware of sox, the various encoding tools (transcode, ffmpeg, et) and
ecasound, but none of those replace the power of Sound Forge under
Windows, at least that I've seen, although I could be missing
something.  I have tried to figure out ecasound but didn't get anywhere
with it.  I have files in mono that I want to convert to stereo for CD
burning but I couldn't figure out how with sox, even after searching
through the man page and reading the help.  I ended up doing it with my
old Sound Forge but I would like to move more of my audio work to Linux
if possible.  Here's the command line I used for sox after reading the
man page:

sox -c 2 file1.wav file2.wav

I thought maybe I need to "mix" the audio, but I want both channels to
be identical to the one mono channel in file1.wav.  I would like some
general pointers to audio tools in Linux and tips on using them.  I'm
running Debian and have added debian-multimedia to my sources.list.
I've searched for various keywords but feel like I'm missing something.
Any tips on getting started with ecasound would be appreciated as so far
I haven't got it to do anything including loading or playing a file.  I
would prefer text mode and curses programs now as I don't have enough
memory to run X.

Thanks all for any help, ideas and pointers.
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