Converge/mix 2 audio streams?

Janina Sajka janina at
Sat Apr 17 15:14:28 UTC 2004

Also, check out ecasound.

Thomas Stivers writes:
> Hash: SHA1
> On 04/14/04 10:21 AM +0100, Guy Abandon. wrote:
> > Hi all.
> > 
> > I am hoping to describe the process I am trying to achieve, so that
> > suggestions of how to achieve it will give me the necessary leads. Man, Help
> > and Docs assume a prior specific knowledge; if only on what tools to read
> > about.
> Check out the sox package. I believe it is precompiled for slackware and
> it can do all the things you have mentioned. 
> > My objective is to:-
> > 
> > 1>  convert and stream a collection of .mp3s sequentially into a single .wav
> > and hopefully, normalise to a lower volume level in the process.
> mpg123 -s file1.mp3 file2.mp3 >output.wav
> > 2>  having done the first step into a pair of long .wav's; to them stream
> > both in parallel or mix them into a third single .wav...   maybe even a long
> > single mp3 but that can be done as an additional later step if necessary.
> soxmix file1.wav file2.wav
> > The key bits are - to sequence a collection into a single entity, normalise
> > such an entity, then mix a pair of such entities into a third single blend.
> I am not exactly sure what you're trying to get it to sound like, but
> check out the -v global option and the stat effect in the sox man page.
> For example when normalizing a narration I use:
> sox somefile.wav -v `sox somefile.wav -e stat -v 2>&1 |cut -d\  -f1` newfile.wav
> This uses sox to get the volume adjustment of the file and then uses that with the
> volume option to set the volume as high as possible without clipping. It
> sounds like you want to lower the volume on the music track, so this
> isn't what you're after, but it should give you some ideas. The sox man
> page is your friend.
> - -- 
> Clarke's Corollary:
> Any technology distinguishable from magic is insufficiently advanced.
> Thomas Stivers	e-mail: stivers_t at
> Version: GnuPG v1.2.4 (GNU/Linux)
> =3auM
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				Janina Sajka, Director
				Technology Research and Development
				Governmental Relations Group
				American Foundation for the Blind (AFB)

Email: janina at		Phone: (202) 408-8175

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