R help - Sep 2011 - Limitations of audio processing in R

Hello everybody

I am trying to process audio files in R and had some problems with files
size. I?m using R packages 'audio' and 'sound'. I?m trying a
really simple
thing and it is working well with small sized .wav files. When I try to open
huge audio files I received this error message: "cannot allocate vector of
size 2.7 Gb". My job is open in R a 3-hour .wav file, make six 5-minute
random audio subsamples, and than save these new files. I have to do the
same process +1500 times. My problems is not in build the function to do the
job, but in oppening the 3-hour files. Does anybody knows how to handle big
audio files in R? Another package that allows me to do this work? I believe
this is a really simple thing, but I really don?t know what to do to solve
that memory problem.

Thank you very much for your answers,
all the best! 

Ulisses

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If you are running Windows it may be as simple as using memory.limit() to
allow R more memory -- if you are on another OS, it may be possible to get
the needed memory by deleting various things in your workspace and running
gc()

Of course, if your computer's memory is <3GB, you are probably going to
have
trouble with R's keeping all objects in memory and will have to get more
creative.

Michael

On Wed, Sep 21, 2011 at 3:43 PM, Ulisses.Camargo <
moliterno.camargo@gmail.com> wrote:
> Hello everybody
>
> I am trying to process audio files in R and had some problems with files
> size. I´m using R packages 'audio' and 'sound'. I´m trying
a really simple
> thing and it is working well with small sized .wav files. When I try to
> open
> huge audio files I received this error message: "cannot allocate
vector of
> size 2.7 Gb". My job is open in R a 3-hour .wav file, make six
5-minute
> random audio subsamples, and than save these new files. I have to do the
> same process +1500 times. My problems is not in build the function to do
> the
> job, but in oppening the 3-hour files. Does anybody knows how to handle big
> audio files in R? Another package that allows me to do this work? I believe
> this is a really simple thing, but I really don´t know what to do to solve
> that memory problem.
>
> Thank you very much for your answers,
> all the best!
>
> Ulisses
>
> --
> View this message in context:
>
http://r.789695.n4.nabble.com/Limitations-of-audio-processing-in-R-tp3831192p3831192.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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With all due respect to those of us (including me) who love R,  when it 
comes to audio processing w/ freeware,

Audacity   FTW.

'nuff said

Carl

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