Dear Ted, Thank you very much about your answer, it really helped. Now I am working on the function that will do all the job with sox help. All the best, Ulisses
2011/9/21 Ted Harding <ted.hard...@wlandres.net> > 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. Iæ´ using R packages 'audio' and 'sound'. > >> Iæ´ 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 donæ 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 ------------------------------ > -- Ulisses Moliterno de Camargo Instituto Nacional de Pesquisas da Amazônia [[alternative HTML version deleted]]
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