From: "dtown22@..." <dtown22@...>
Date: 2007-10-27T03:40:07+09:00
Subject: Re: cant seem to get system() & pipe to work together

Hi Mac,

Thanks for taking the time to help me on this. I wasnt aware that
there was a way to load executables into ruby, but the weird thing, is
that if I remove the pipe (|), or separate the commands, those files
are executed. Which is why I am lead to believe that my problem is the
result of the pipe. But here is my program:

(I slightly modified it to simplify things, but you should get the
idea)

def convert2MP3(path)
  raise ArgumentError unless File.directory?(path)

  ffmpeg = '"C:\\Documents and Settings\\dt\\Desktop\\my stuff\\songs\
\wma\\ffmpeg.exe"'
  lame = '"C:\\Documents and Settings\\dt\\Desktop\\my stuff\\songs\
\wma\\lame.exe"'

  Dir.entries(path).each do |child|
	if File.basename(child) =~ /wma$/
	  puts "converting to mp3"
	  child = path + File::SEPARATOR + child
	  child = child.gsub('/', "\\")
	  child = child.gsub('\\\\', "\\")
	  child = '"' + child + '"'
	  newFile = child.sub('wma', 'mp3')
	  #cmd = ffmpeg + " -i " + child + " -vn -f wav - | "  + lame + " -V
6 - " + newFile
	  cmd1 = "#{ffmpeg} -i #{child} -vn -f wav - | #{lame} -V 6 -
#{newFile}"
	  #cmd2 = `#{lame} -V 6 - #{newFile}`
	  puts cmd1
	  system(cmd1)

	  if File.exists?(child)
		  #File.delete(child)
	  end
	end
  end
end

startingDir = "C:/Documents and Settings/dt/Desktop/my stuff/songs//
Who The/Quadrophenia/"

convert2MP3(startingDir)

-d

On Oct 26, 10:24 am, Michael Linfield <globyy3...@hotmail.com> wrote:
> dtow...@gmail.com wrote:
> > "C:\Documents and Settings\dt\Desktop\my stuff\songs\wma\ffmpeg.exe" -
> > i "C:\Documents and Settings\dt\Desktop\my stuff\songs\Who The
> > \Quadrophenia\07-0 - Who The - Love Reign O'er Me.wma" -vn -f wav - |
> > "C:\Documents and Settings\dt\Desktop\my stuff\songs\wma\lame.exe" -V
> > 6 - "C:\Documents and Settings\dt\Desktop\my stuff\songs\\Who The
> > \Quadrophenia\07-0 - Who The - Love Reign O'er Me.mp3"
>
> > It works perfect from the command line, but no matter how i try it
> > (with double quotes, single quotes, backticks, etc) it doesnt seem to
> > want to work from ruby
>
> > Here is an example of the code I have
>
> >  ffmpeg = '"C:\\Documents and Settings\\dt\\Desktop\\my stuff\\songs\
> > \wma\\ffmpeg.exe"'
> >   lame = '"C:\\Documents and Settings\\dt\\Desktop\\my stuff\\songs\
> > \wma\\lame.exe"'
>
> > newFile = child.sub('wma', 'mp3')
> > #cmd = ffmpeg + " -i " + child + " -vn -f wav - | "  + lame + " -V 6 -
> > " + newFile
> > cmd1 = "#{ffmpeg} -i #{child} -vn -f wav - | #{lame} -V 6 -
> > #{newFile}"
> > puts cmd1
> > system(cmd1)
>
> > NOTE: child points to the same file wma file as above.
>
> > If i copy and paste the output of the puts command above into a
> > command window, it works fine...but from ruby, it seems to ignore the
> > pipe (|) command. I dont know if this is a windows issue, or if i am
> > missing something obvious. Any help is greatly appreciated.
>
> Alright lets approach this from a different perspective. First, the
> reason that lame or ffmpeg arnt working is because its loading them as
> strings into ruby, instead of loading the exe's. There should be a gem
> or lib in ruby that loads exe's into memory but i havnt had the time
> today to fumble around the net for it. Using a gem to convert these
> files would be alot better than loading exes into memory. If you were on
> linux you could do all this with some bash scripting but :( we'll find
> another way.
>
> >cmd1 = "#{ffmpeg} -i #{child} -vn -f wav - | #{lame} -V 6 -
> > #{newFile}"
>
> the reason this isnt working is because Ruby doesnt take command line
> arguements like Windows cmd.exe or command.com does. Ruby interprets
> these as minus signs and negative signs. I would imagine running this
> gives you some outrageous errors. If you could post your entire program
> and we'll see if we cant find a gem or lib that will do this.
>
> - Mac
> --
> Posted viahttp://www.ruby-forum.com/.