dvd minimum bitrate?

Discussion in 'Computers' started by Christ Reynolds, Aug 4, 2003.

  1. Christ Reynolds

    Christ Reynolds Producer

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    i'm making dvds of some poor quality videos, and since they look so bad, i was going to put a ton of them onto one dvd. so my real question is, do stand alone dvd players need a certain bitrate to play? i havent figured out the bitrate exactly, but my estimates put it around the 700 kbit/s or so. i dont think this would be too low, i am hoping. can anyone enlighten me? i am searching around on dvdrhelp.com but their forums are so messy. i'll be playing the disc in a sony dvp-c660. any help is much appreciated.

    CJ
     
  2. John_Berger

    John_Berger Cinematographer

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    Make an MPEG-1 DVD instead. If you make an MPEG-1 DVD using the VideoCD bitate (1,150 video/224 audio), you'll get upwards of 7 hours on a single DVD. I've done it with a few different collections of bad-quality videos and it works just fine.
     
  3. Christ Reynolds

    Christ Reynolds Producer

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  4. John_Berger

    John_Berger Cinematographer

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    Now, wait a minute. What format are the videos currently in?
     
  5. John_Berger

    John_Berger Cinematographer

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    I couldn't find anything about minimum bit rates, only maximum bit rates.

    MPEG-1 : 1.856 Mbps (audio + video)
    MPEG-2 : 9.8 Mbps (audio + video)

    These numbers from what I understand are a bit different if PCM audio is being used.
     
  6. Christ Reynolds

    Christ Reynolds Producer

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    they are currently in avi format, but bitrate is bitrate, no? i'm assuming you are talking about my statement about fitting them all onto one disc. about the minimum bitrates, i think it may depend on the player?

    CJ
     
  7. John_Berger

    John_Berger Cinematographer

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  8. Christ Reynolds

    Christ Reynolds Producer

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  9. Wayne Bundrick

    Wayne Bundrick Cinematographer

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    If 11 hours of video already fits as data files on a DVD+R then it must be postage stamp sized and lacking the size and detail worthy of being displayed full screen on a television.

    715 kilobits per second at 30 frames per second is less than 3 kilobytes per frame of video. I wouldn't want to look at one 3K JPEG that is 720x480, or even 320x240. [​IMG]
     
  10. Christ Reynolds

    Christ Reynolds Producer

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    well, the vid is 304x232, 30 fps, and its certainly not in good shape. however, its all i have to deal with. i dont see a dvd release of these shows anywhere on the horizon, and i am sick of watching them on my computer. i put 10 (out of a total 30) shows on one dvd before, and the quality sure is bad, its not THAT bad. certainly acceptable for me until a proper dvd is released.

    CJ
     
  11. Rob Gillespie

    Rob Gillespie Producer

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    Why limit to one DVD-R?
     
  12. Christ Reynolds

    Christ Reynolds Producer

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  13. Wayne Bundrick

    Wayne Bundrick Cinematographer

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  14. John_Berger

    John_Berger Cinematographer

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  15. Christ Reynolds

    Christ Reynolds Producer

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  16. Ken Chan

    Ken Chan Producer

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    Wow, confusion abounds [​IMG]

     
  17. Christ Reynolds

    Christ Reynolds Producer

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  18. Ken Chan

    Ken Chan Producer

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    Whoops, even I got confused [​IMG] You need to windowbox inside 352x240, not 320 (320x240 is not one of the allowed sizes, as John listed). Note that DVD ratios are not square pixel aspect ratios like the ones used on computers, so if you don't resize, everyone will appear a little skinny. However, whether that would be worse than what you get after resizing -- you should try both.

    Because it's a standard size, DVD players (should) know how to display 352x240 correctly to fill the screen. Certainly any black bars on the top and bottom would be hidden by typical overscan. If you don't resize, even the bars on the sides would be mostly hidden as well.

    And MPEG-4 is more efficient than MPEG-2 and MPEG-1, so there is no way you'd be able to use the same bitrate.

    //Ken
     
  19. Christ Reynolds

    Christ Reynolds Producer

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    ok i finally got the dvdhelp.com bitrate calculator to work, and got all the units in order...the calculator uses kbit/sec. so heres what i came up with---

    video length 10h 56m 43s
    audio bitrate 64 kbit/sec
    calculated bitrate 863 kbit/sec
    dvd max bitrate 9734 kbit/sec

    so i have a target bitrate for all the episodes on one dvd, if my sample looks terrible then i'll spread them out. thanks for all the replies, i hope i can finally get this thing done! [​IMG]

    CJ
     
  20. Wayne Bundrick

    Wayne Bundrick Cinematographer

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    I hope you're testing by burning to rewritable so you can reuse it.
     

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