Help: Why does an 89MB, 20 Minute Flash video Take up 1.19GB on a DVD?

Discussion in 'Digital Video' started by todd2000, Jan 12, 2011.

  1. todd2000 macrumors 68000

    Joined:
    Nov 14, 2005
    Location:
    Danville, VA
    #1
    So Im trying to burn some FLV files to DVD with Toast 10 to play in a DVD player. They are roughly 89MB a piece and about 20 min long, but each file is taking up about 1.19GB of space on the DVD. Seems kind of excessive. I have some other video files that are longer, and 3 times the size and they take up less then 1/2 the space. I tried converting the FLVs to MPEG, but that didn't help. Im kinda new to burning DVDs. Any ideas?

    I attached a screen shot with the info for one of the files:

    Thanks!
     

    Attached Files:

  2. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
    #2
    That is because most modern videos, distributed via file sharing or video viewing sites like YouTube, use an MPEG-4 codec variant like Dvix or Xvid or H264 or .x264 or ..., which is much more efficient than the MPEG-2 codec used for video DVDs, as MPEG-2 is older than MPEG-4.
    Video on video DVDs is bound to take more storage space than a downloaded .avi file with 700MB for 90 minutes of video, use the forum search to find dozens of similar threads. Or use MRoogle.
     
  3. jwheeler macrumors regular

    Joined:
    Jan 14, 2010
    #3
    I thought DVDs were just less compressed to make them easier to read.
     
  4. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
    #4
    MPEG-2 is not as CPU intensive as MPEG-4, if that is what you think. As the video DVD emerged in the 90s of the last century, decoding units were a lot slower than today, especially with entertainment utilities.
    Otherwise, MPEG-2 is harder to read on Mac OS X, as you need the QT MPEG-2 PlayBack Component to open a video DVD in QT or even MPEG Streamclip, though one can open video DVDs easily in Handbrake or VLC Player, though if one wants to edit footage from a video DVD, it is quite "complicated" to get the proper format out of it.

    MPEG-4 is newer and much more CPU intensive, see AVCHD editing threads.
     
  5. -DH macrumors 65816

    Joined:
    Nov 28, 2006
    Location:
    Nashville Tennessee
    #5
    You thought wrong.

    -DH
     
  6. martinX macrumors 6502a

    martinX

    Joined:
    Aug 11, 2009
    Location:
    Australia
    #6
    A couple of general principles.

    • Increased data rate gives increased quality
    • Bigger frame size means bigger file size

    The first one is only half applicable to you. You are going from a very compressed file to a not as compressed one. Toast has no idea about the quality of your source file, it's just doing what it always does: makes a DVD of average MPEG2 bitrate that looks OK on a TV.

    If you were coming from a less compressed project, that'd be fine. You'd get a nice DVD at a comparatively reasonable size. However, you're going the other way so you're thinking "Why is this so?". To compound your confusion, you're going from a small frame size to a larger one which will also result in a bigger file size. Sad thing is, none of this will help your final result look any better.
     

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