Discussion in 'Digital Video' started by brent1a, Aug 1, 2007.

  1. brent1a macrumors member

    Jan 9, 2005
    If I have the contents of an HD-DVD is there a converter yet for mac that will allow me to convert this to a video file (1080p-1080p) so that I can burn it to a regular DL DVD?
  2. Sdashiki macrumors 68040


    Aug 11, 2005
    Behind the lens
    I found this

    Im thinking that taking a 18mbit+ and downconverting it is gonna take a long, long time to render.

    Good luck!
  3. brent1a thread starter macrumors member

    Jan 9, 2005
    I'm not necessarily wanting to downconvert so much as convert the video files to regular dvd compatible then shrink them onto a normal DL DVD.
  4. Sdashiki macrumors 68040


    Aug 11, 2005
    Behind the lens
    That is DOWNconverting.

    You are going from something with more pixels to less.

    You are taking more information, and making it less information.

    Its not that your HD DVD video file wont fit, filesize wise, on a DL DVD. Its that its something totally different and not made for the DVD standard, but the HD DVD standard.

    So you not only have to rip the HD DVD, you then have to convert that video to SD DVD video, downconverting.
  5. brent1a thread starter macrumors member

    Jan 9, 2005
    OK, makes sense. Big question is, would it be worth my time? Would a picture that I've done all that for be any better than a normal DVD picture?
  6. huntercr macrumors 65816

    Jun 6, 2006
    Short Answer: No.

    Long Answer: Yes. Lets assume you are encoding a hollywood movie. Since the HD-DVD is recorded at higher resolution and overall bitrate, you can select a bitrate that is higher for both video and audio than the one that the Studio picked for their regular DVD release. Especially if this is a movie longer than typical and they choose to squeeze it on 1 DVD.
    Also if you don't mind multiple DVDs you can make this be even higher.
    But you're stuck with the resolution at 720x480, so you're going to hit an upper limit where it won't "look" any better even at higher bitrates.
    Is all this worth it? Rent the released DVD and compare. I'm guessing it won't be a noticable difference, though there are some terrible DVDs out there.
  7. mrgreen4242 macrumors 601


    Feb 10, 2004
    This is a kind of old thread but I came across it in a search for something else and I didn't think the OP's question was answered accurately or adequately.

    What you are doing is possible, yes. I think a lot of the people who responded assumed you wanted to make a DVD Video standard compliant disc. I assume that's not the case, else you would have just bought/rented/whatever the regular DVD.

    What you want to do, I think, is make an HD copy of the movie and store it on a DVD-9. This is prefectly possible, and is in fact part of the HD-DVD (and BD) standard. You can even make the disc with the HD-DVD disc structure so it will playback in a stand alone HD-DVD player (that's called 3x DVD).

    In either case, what you are doing is taking a high bittrate, high resolution video file and transcoding it into a lower bittrate, lower resolution file. How low you go is Dependant on how long the video is and how many discs you want to use. You can get pretty good (read: better than most cable companies HDTV channels, and on par with OTA HD broadcasts) quality with h264 on a DVD-R DL. If you shrink to 720p (true HD regardless of what Sony wants to tell you) and compress at ~10mbps (which is double the bittrate the Apple TV plays back for the same resolution, btw) you can squeeze 2 hours onto a DVD-R DL with enough space left over for a full 5.1 AC3 soundtrack.

    If you want to play these back on a stand alone HDDVD player, you'll need to format the discs directory structure correctly and use the right file structure, etc. On the other hand, if you wanted to play these back via a media center PC or an XBox360 or something you can just through h264 files onto a disc and play it (although some devices may not like files over 4gb).

    Hope that gives you a little more something to go on...

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