Problem compressing files- REALLY URGENT.

Discussion in 'Mac Apps and Mac App Store' started by Scylax, May 27, 2010.

  1. Scylax macrumors regular

    Joined:
    Jun 14, 2009
    #1
    I have to submit an assignment to the Open University within the next couple of days. It consists of an essay and an MP3 recording which must be zipped into a single file of under 2mb. My original files amount to circa. 4.8mb. I can create a zip file from them, but the size of this file is still 4.4mb! What should I do? I used Audacity to do the recording btw, as this is recommended by the University.

    Please help me out quickly guys- This is a really big deal to me!

    Thanks,

    Helen.
     
  2. miles01110 macrumors Core

    miles01110

    Joined:
    Jul 24, 2006
    Location:
    The Ivory Tower (I'm not coming down)
    #2
    You need to encode the audio file at a lower bitrate.
     
  3. wrldwzrd89 macrumors G5

    wrldwzrd89

    Joined:
    Jun 6, 2003
    Location:
    Solon, OH
    #3
    You can play around with the bit rate and the sample rate of the file to alter its size. For instance, an audio file (any format) with ZZZ bit rate and YYY sample rate has XXX size. If you resave the same file, with ZZZ/2 bit rate and YYY/2 sample rate, the size will be approximately XXX/4.
     
  4. Peace macrumors Core

    Peace

    Joined:
    Apr 1, 2005
    Location:
    Space--The ONLY Frontier
    #4
    If it's voice only change the quality to voice. That will reduce the size a lot.
     
  5. djdavidgallant macrumors member

    djdavidgallant

    Joined:
    Jul 11, 2009
    Location:
    Boston, MA
    #5
    Throw it into 1 channel mono, instead of 2 channel left and right. It will use the same channel for playback in both of your speakers, instead of having a nearly identical left and right set of channels.
     
  6. Scylax thread starter macrumors regular

    Joined:
    Jun 14, 2009
    #6
    Thanks for all the quick answers everybody- I don't know what I'd do without these forums!

    But please could someone tell me if there's a way I can convert my existing file to a lower bitrate in audacity, or do I have to start all over again (Please, no!). I am getting frantic, and I so much appreciate the help.

    Thanks,

    Helen.
     
  7. dstearns96 macrumors member

    dstearns96

    Joined:
    Dec 16, 2007
    #7
    Ok, what you do is you go to File>Export. It gives you an option of different file types. I would recomend mp3 at 128 kbps, but you can do whatever you want.
     
  8. wrldwzrd89 macrumors G5

    wrldwzrd89

    Joined:
    Jun 6, 2003
    Location:
    Solon, OH
    #8
    You can very easily change the parameters of your audio file in Audacity, assuming you have the original audio file and/or .aup project file. Assuming you take the AUP approach, open the AUP file. You can change the project sample rate using the little pull-down in the lower-left corner. The bit rate is changed in the export settings, when you export as MP3.
     

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