Compressing Quicktime File to a Target Size

Discussion in 'Digital Video' started by dignan., Nov 12, 2011.

  1. dignan. macrumors newbie

    Joined:
    Oct 29, 2011
    #1
    I know there are many threads on compression but I have yet to find an adequate answer. I need to compress a Quicktime file from over 2G to 500mb. The file must remain Quicktime.

    Is there not a program where the user can set a target size for the compressed file, other than HandBrake which does not export .MOVs?

    Any help is much appreciated. I have tried compressing several times on a trial and error basis which is very time consuming and challenging.
     
  2. careypo macrumors member

    Joined:
    Oct 15, 2011
    #2
    I think your best bet is to get Apple's Compressor. It's $50 and it supports all Quicktime formats. To get to a target file size you need to figure out what the bit rate is. (File Size/Time) x 8 = bit rate. Next, adjust the bit rate in Compressor to match your intended file size.
     
  3. initialsBB macrumors 6502a

    Joined:
    Oct 18, 2010
    #3
    MPEG Streamclip is your friend and it's free.

    You'll have to tell us how long the film is so that you can calculate the maximum bit rate for video+audio.
     
  4. cgbier macrumors 6502a

    Joined:
    Jun 6, 2011
    #4
    Google for a bit rate calculator. It'll help you to determine the bitrate needed for compression to target size.

    But on the other hand: what bit rate does the original have? Divide that by four and you have your number (err on the smaller side though)
     
  5. dignan., Nov 12, 2011
    Last edited: Nov 13, 2011

    dignan. thread starter macrumors newbie

    Joined:
    Oct 29, 2011
    #5
    Thanks for the responses.

    The video is 1 hour 25 minutes and 46 seconds long and 2.7G. My target size is under 500mb.

    MPEG Streamclip says that my audio is 256kb/s.

    I used this calculator: http://www.3ivx.com/support/calculator/index.html

    So the answer is 524kb/s. I punched this into Quicktime and my exported video file was still over a gigabyte! MPEG Streamclip is not allowing me to limit data rate. Perhaps I need to change from 24 f/s to 29 f/s?
     
  6. dignan. thread starter macrumors newbie

    Joined:
    Oct 29, 2011
  7. KeithPratt macrumors 6502a

    Joined:
    Mar 6, 2007
    #7
    Compress in Handbrake then open the resulting file in MPEG Streamclip and File > Save As > MOV
     
  8. dignan. thread starter macrumors newbie

    Joined:
    Oct 29, 2011
    #8
    How was that so easy!? What's the point of exporting files when you can just save them in a different format in a minute?

    Thanks.
     

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