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Post By
Henrique Ferreira

In Reply To
keymaker

Subj: Re: Meteor has a dumb question...
Posted: Thu Jan 10, 2008 at 05:37:30 am EST
Reply Subj: Re: Meteor has a dumb question...
Posted: Wed Jan 09, 2008 at 01:56:43 pm EST


Previous Post

> > Ok the reason I asked was because I saw this on wikipedia:
> >
> > The choice of codecs affects the producer's licensing/royalty costs, as well as the title's maximum runtime, due to differences in compression efficiency. Discs encoded in MPEG-2 video typically limit content producers to around two hours of high-definition content on a single-layer (25 GB) BD-ROM. The more advanced video codecs (VC-1 and H.264) typically achieve a video runtime twice that of MPEG-2, with comparable quality.
> >
> > So I wasn't sure if that meant the codec limited how much the disc could hold to a couple hours or something else.
>
> Yeah, the codec limits it, just like on DVD. You can encode 12 42-minute episodes of a given show on XviD (roughly 8 hours worth of video), at a 800~1100Kbps video rate and 125Kbps MP3 sound rate, and you'll have twelve ~350MB files, which fit on a (single-layer) DVD, but can only be played on a PC or on a DivX player.
>
> Or you can encode 150 minutes of video at 3837Kbps in MPEG-2 with audio at 224Kbps audio and it'll fit on a (single-layer) DVD - on DVD Video format, which will play in any DVD player.
>
> H264 compression, for those who know how to work with it, is great because at a similar bitrate than the XviD above it has much better quality, and at a smaller bitrate, it can still achieve at least the same, if not better, quality. Of course, other problems regarding the encoding arise, making it harder to work with for some kinds of videos, but that's neither here nor there (and I'm not informed the least to elaborate on that).
>
> Suffice to say, the choice of the codecs with which the video is encoded has affected the DVD just like it will affect the BRD. Think of the BRD as a 25GB (or 50) DVD. From a DVD to a BRD (with the same number of layers) you can roughly multiply the hours of video 6 times at the same quality, increase the quality 6-fold, or any of the variants in-between (any mix of adding more video and increasing the overall quality).
>
> Henrique Ferreira
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Battlestar Galactica MB
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im sorry for this but how much of a cost is blue ray and HD Dvds. i wonder if there ever make like blue ray or Hd in movie theaters

> im sorry for this but how much of a cost is blue ray and HD Dvds.

BDRs are more expensive than HD-DVDs, since they are a new technology, and are (IMHO) better. I have not seen any retail prices, so I dunno how that difference translates to the finished product.

> i wonder if there ever make like blue ray or Hd in movie theaters

If it ever gets better than the technology they use, I'm sure they will.

Henrique Ferreira




Battlestar Galactica MB

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