13 minutes of footage, 2.61GB?

Discussion in 'Digital Video' started by DaveinJapan, Jun 14, 2005.

  1. macrumors member

    Joined:
    Apr 9, 2005
    Location:
    Japan
    #1
    I have some video clips on iMovie and wanted to see if this is a normal size for a video file. One is 13 min. and is 2.61GBm the other is 15 minutes and is 3.04GB, is this normal (I'm in a debate with friends over this, they insist that these files should be much smaller)?
     
  2. macrumors 603

    wordmunger

    Joined:
    Sep 3, 2003
    Location:
    North Carolina
    #2
    I know nothing about video but that seems big to me. A whole DVD is only about 5 GB.
     
  3. macrumors 604

    Lacero

    Joined:
    Jan 20, 2005
    #3
    That's about right. You are working with DV footage right? DV25 = 3.6MB per second, or 13 GB per hour.
     
  4. Moderator emeritus

    mad jew

    Joined:
    Apr 3, 2004
    Location:
    Adelaide, Australia
    #4
    Isn't it like Garageband in that the files are massive until you export them?
     
  5. Moderator emeritus

    WinterMute

    Joined:
    Jan 19, 2003
    Location:
    London, England
    #5
    Rule of thumb is 4 mins of DV stream footage = 1Gb.

    DVD's use MPEG2 encoding which drops from 3.2Mb/sec to a maximum of 9Kb/sec usually running at around 6-7Kb/sec, so a minute of MPEG2 comes in around 35-45Mb.

    This is dependant on frame size, bitrate and frame-rate too.

    You don't have to use MPEG2, QuickTime allows many codecs to be used, the new H264 is a very good quality vs Size trade-off, as is the Sorenson 3 codec.

    Many cross platform vids are done in DivX, which is, I believe, a variant of the AVI wrapper.

    Video makes for big files, I've got around 200Gb of active video on a Lacie FW800 at the moment and I'm an audio engineer... Go figure... :D
     
  6. thread starter macrumors member

    Joined:
    Apr 9, 2005
    Location:
    Japan
    #6
    Thanks, everyone. :)
     
  7. macrumors 68000

    DeSnousa

    Joined:
    Jan 20, 2005
    Location:
    Brisbane, Australia
    #7
    Yeah i was shocked the first time when i imported clips it was around the same length and size.
     
  8. macrumors 6502a

    evil_santa

    Joined:
    Sep 23, 2003
    Location:
    London, England
    #8
    I work with uncompressed PAL SD video at work, that works out at about 70GB per hour. That eats up HS space quite quickly. It is fun to work with as the Dell I have to use, only has a second internal drive for the media & it is only just fast enough to capture video on. :D
     
  9. macrumors 6502a

    JDOG_

    Joined:
    Nov 19, 2003
    Location:
    Oakland
    #9
    yeah definitely had to pick up an second external drive last week to keep up with space. I've been working on some side projects in FCP from miniDV and with four tapes logged I've already eaten up 80 gigs of a 250 gig HD. Must be ridiculous to work with Hi-Def!
     

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