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Movie Length vs Data Size

Discussion in 'Convert DVD to another format' started by alseides, Feb 16, 2005.

  1. alseides

    alseides Guest

    I kind of started a post earlier but I realize I had a different question which deserved a new fresh post, so here goes:

    I recently copied "Mothman Prophecies" to a DVD 100% intact to the original commercial DVD. Here are the specs:

    TOTAL SIZE: Fits on to DVD5 (SINGLE LAYER)
    119minutes (yes, almost 2 full hours worth)
    English AND French surround sound
    Theatrical trailer
    Music Video

    Movie Causing me to pull my hair out:
    House of Flying Daggers.
    Commercial DVD Source: DVD9 Dual Layer
    Cut out EVERYTHING using shrink. Only the main movie was ripped - all menus, other audio tracks, special features GONE. Just the movie, plain and simple.

    Length: 114minutes
    SIZE: 6.08Gigs.




    I want to know why. the movies are 3 gigs apart and this is the smaller one having all the extras AND another audio track. This makes no sense to me at all and preventing me from backing up the great movie. help please! Thanks, and sorry for sounding so distressed. :)

    please keep in mind there is no compression involved whatsoever on my part. and i do not want to compress as a solution.
     
    Last edited by a moderator: Feb 16, 2005
  2. bazilla

    bazilla Regular member

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    Read up on what you can about bitrate.

    On the second one, are you saying that even after cutting everything out, dvd shrink cannot get it down below 6.08 gigs?
     
  3. alseides

    alseides Guest

    yea, thats right. i stripped everything with shrink leaving just the main movie and audio track. wont go below 6.08gb.

    as for bitrate, i was aware of that, i just thought all dvds had the same bitrate. like some standard they had to follow or something. seems like what you are suggesting is that the overly large movie is encoded at a much higher bitrate resulting larger size. if that is the case, its something that is not possible to fix, correct?
     
    Last edited by a moderator: Feb 16, 2005
  4. bazilla

    bazilla Regular member

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    There are some "standard" bitrates, but I've always been under the impression that dvd shrink will use a "custom" bit rate to get the files down to where they fit on a dvd5 (or in my case, down to 4300 MB, which I've set as the max size so as not to burn all the way to the edge).

    Uh...I've got a thought here that you've got a setting wrong in dvd shrink. I've never seen where it would not shrink the entire contents of a dvd9 to dvd5, if you asked it too. And that's what you want to do. Go Edit-->Preferences and look on the first tab. You'll see a pull-down menu with three options: dvd9, dvd5, and custom. I'm guessing you have yours set to dvd9. Change it to dvd5 (or, to do what I do, chose "custom" and set it to 4300).

    If I'm right, and you've got it set to dvd9, then dvd shrink is indeed selecting a bit rate that is too high to fit it onto a dvd5. Choose dvd5, and it will lower the bitrate to get it onto a dvd5.
     
  5. alseides

    alseides Guest

    lowering the bitrate degrades video quality, right? isnt that what compression is?

    my dvdshrink settings is set to dvd5. as i stated in my original post i dont want to compress it at all. for a movie of this length it should fit on a dvd5 anyways. but it doesnt so i just wanted to know any possible reasons as to why.

    perhaps you are correct about the bitrate being very high, thus taking more space. if this is the case, i dont think there is anyother solution is there?
     
    Last edited by a moderator: Feb 17, 2005
  6. bazilla

    bazilla Regular member

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    I'm sorry I missed the part about no compression. That's an unreasonable objective. The video is already compressed. The best you could hope for is not to compress it any further. But if that's your goal, then in this case you are out of luck.

    Look at it this way. An uncompressed 2 hour movie would require 144 GB's of storage capacity. What you've got is already compressed down to 6 GB, a 24 to 1 ratio. To get it down to 4.3 GB, you'll have to compress it to about 71 percent of the original compression. That's a little on the low side, I agree, and if you strain you might be able to see the loss of quality. But I'll bet that if you don't tell anyone the average person wouldn't notice.

    If you are really determined not to compress it further, I see only two alternatives: burn to a dual layer dvd, or reauthor it and split it over two dvd5s.
     
  7. alseides

    alseides Guest

    thanks for the help. i guess ill just keep it on my harddrive until dual layerd discs are affordable. heh.
     

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