Also with Linux you can add more swap memory(which I'm pretty sure R spills into if it hasn't reached it's internal limits on 32 bit installations). Windows pagefile is kind of obnoxious. Ken Hutchison
On Sep 21, 2554 BE, at 5:05 PM, (Ted Harding) <ted.hard...@wlandres.net> wrote: > Hi Ulisses! > Yes, "get more creative" -- or "get more memory"! > > On the "creative" side, it may be worth thinking about > using an independent (non-R) audio file editor. I'm > writing from the standpoint of a Linux/Unixoid user > here -- I wouldn;t know how to set ebout this in WIndows. > > You could use R to create a shell script which would run > the editor in such a way as to extract your 6 random samples, > and save them, where the script would be fed with the > randomly-chosen 5-minute intervals decided by R. This > could be done under the control of R, so you could set > it up for your 1500 or so sets of samples, which (with > the right editing program) could be done quite quickly. > > On Linux (also available for Windows) a flexible audio > editor is 'sox' -- see: > > http://en.wikipedia.org/wiki/SoX > > To take, say, a 5-minute sample starting at 1 hour, > 10 min and 35sec into the audio file "infile.wav", > and save this as "outfile.wav", you can execute > > sox infile.wav outfile.wav trim 01:10:35 00:05:00 > > and such a command could easily be generated by R and > fed to a shell script (or simply executed from R by > using the system() command). My test just now with > a 5-minute long sample from a .wav file was completed > in about 5 seconds, so it is quite efficient. > > There is a huge number of options for 'sox', allowing > you to manipulate almost any aspect of the editing. > > Hoping this helps, > Ted. > > > On 21-Sep-11 19:55:22, R. Michael Weylandt wrote: >> 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.cama...@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 > > -------------------------------------------------------------------- > E-Mail: (Ted Harding) <ted.hard...@wlandres.net> > Fax-to-email: +44 (0)870 094 0861 > Date: 21-Sep-11 Time: 22:05:55 > ------------------------------ XFMail ------------------------------ > > ______________________________________________ > 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. ______________________________________________ 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.
