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DVD Formats
What formats are the typical movie DVD's in that you buy or rent? Are
they -R, +R, or some other type? Thanks, BB |
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wrote in message ... What formats are the typical movie DVD's in that you buy or rent? Are they -R, +R, or some other type? Thanks, BB The stamped DVD are read as dvd-rom. Here are two links that might help in understanding the different formats and how the interact. http://www.cdfreaks.com/article/150 http://www.signvideo.com/btst-d.htm |
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On Fri, 04 Feb 2005 02:30:13 GMT, wrote: What formats are the typical movie DVD's in that you buy or rent? Are they -R, +R, or some other type? Thanks, BB The DVDs you buy are totally different. They actually hold way more data. Store bought DVDs may encompass a variety of formats for all I know but they used to say it was DVD 9 around 8.5 gigs I think. The writables DVD+/- hold way less. Thats why you have to usually use something like DVD shrink etc to compress the files to fit on writable unless you rip only a few files. Sometimes you can just rip the main movie and itll fit on a writable w/o compressing. You know people are still saying DVD-Rs are vastly more compatible than +Rs but back when DVD players really were more less compatible a few tests at some sites showed that the gap wasnt exactly huge between +/- and Im sure the more recent players are far more compatible with both. Frankly from my old 2.4x speed Memorex to my Nec burner now Ive used +/- and they both work on every players Ive tried them on -- a really old Panasonic, Apex, Lennox, Proton, Pioneer , Sony etc. However I do see people posting from time to time that they cant get any player to play their disks. Somewhat unrelated to the type of media, but a question that has been unanswered in my mind: I know that most DVD burners do not burn Dual Layer media today, and many written DVDs that are bought are dual layer. That is why programs that strip away unwanted portions of the DVD a person is wanting to copy are popular. My question is just how is the second layer on a DVD read? Does the reader read all of one layer before reading the second layer, or does it alternate between layers on a DVD when reading it? The answer is just to satisfy a curiosity, and nothing more. Thanks. |
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On Fri, 04 Feb 2005 13:41:31 GMT, Ken wrote:
Somewhat unrelated to the type of media, but a question that has been unanswered in my mind: I know that most DVD burners do not burn Dual Layer media today, and many written DVDs that are bought are dual layer. That is why programs that strip away unwanted portions of the DVD a person is wanting to copy are popular. My question is just how is the second layer on a DVD read? Does the reader read all of one layer before reading the second layer, or does it alternate between layers on a DVD when reading it? The answer is just to satisfy a curiosity, and nothing more. Thanks. Actually I think most or a lot of the new burners are dual layer now. Mine is and I got mine cheap (NEC) a while ago its pretty old hat now to get a burner with that ability, The problem is no one is hardly doing it so it hasnt caught on at all because the media is grossly expensive compared to DVD-R single layer media which has been falling like crazy. In fact since compressing it a bit or ripping only the main movie etc is so easy and popular --- it maybe the case that Blu Ray or the competing format may be on the mkt and actually start catching on bypassing dual layer if the media doesnt start falling in price reasonably soon. I am no techie when it comes to the formats I only know what I read. Heres some info from one site: The two layers on a dual-layer DVD are a reflective layer called Layer 0 and a semi-reflective layer called Layer 1. Layer 0 is always written first, and generally, the data that doesn't fit on Layer 0 goes on Layer 1. All DVD players are equipped to read dual-layer (DVD-9) discs. The read laser refocuses when switching layers. According to LaBarge, it's advisable, whenever possible, to place layer changes at inconspicuous points in the video, when the screen is dark or the audio silent, so viewers won't notice if the player pauses to refocus the laser. (Some older players with smaller read-ahead buffers will pause no matter what; my 1999-vintage Pioneer DV-414, which trumps cheap new players on media compatibility and playing high bit-rate video from recordable media, pauses noticeably on every layer change). LaBarge also recommends lowering the video bit rate just prior to the layer change to allow the data buffer to store more frames. This tip only applies to authors using variable bit rate encoding, a feature not available in popular consumer tools. But it certainly applied to anyone authoring DVD-9s for replication when DVD Authoring & Production was published—a high-end professional audience—and will apply to most early adopters of dual-layer writable DVD technology. http://www.emedialive.com/Articles/P...ArticleID=8421 |
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wrote:
On Fri, 04 Feb 2005 13:41:31 GMT, Ken wrote: Somewhat unrelated to the type of media, but a question that has been unanswered in my mind: I know that most DVD burners do not burn Dual Layer media today, and many written DVDs that are bought are dual layer. That is why programs that strip away unwanted portions of the DVD a person is wanting to copy are popular. My question is just how is the second layer on a DVD read? Does the reader read all of one layer before reading the second layer, or does it alternate between layers on a DVD when reading it? The answer is just to satisfy a curiosity, and nothing more. Thanks. Actually I think most or a lot of the new burners are dual layer now. Mine is and I got mine cheap (NEC) a while ago its pretty old hat now to get a burner with that ability, The problem is no one is hardly doing it so it hasnt caught on at all because the media is grossly expensive compared to DVD-R single layer media which has been falling like crazy. In fact since compressing it a bit or ripping only the main movie etc is so easy and popular --- it maybe the case that Blu Ray or the competing format may be on the mkt and actually start catching on bypassing dual layer if the media doesnt start falling in price reasonably soon. I am no techie when it comes to the formats I only know what I read. Heres some info from one site: The two layers on a dual-layer DVD are a reflective layer called Layer 0 and a semi-reflective layer called Layer 1. Layer 0 is always written first, and generally, the data that doesn't fit on Layer 0 goes on Layer 1. All DVD players are equipped to read dual-layer (DVD-9) discs. The read laser refocuses when switching layers. According to LaBarge, it's advisable, whenever possible, to place layer changes at inconspicuous points in the video, when the screen is dark or the audio silent, so viewers won't notice if the player pauses to refocus the laser. (Some older players with smaller read-ahead buffers will pause no matter what; my 1999-vintage Pioneer DV-414, which trumps cheap new players on media compatibility and playing high bit-rate video from recordable media, pauses noticeably on every layer change). LaBarge also recommends lowering the video bit rate just prior to the layer change to allow the data buffer to store more frames. This tip only applies to authors using variable bit rate encoding, a feature not available in popular consumer tools. But it certainly applied to anyone authoring DVD-9s for replication when DVD Authoring & Production was published—a high-end professional audience—and will apply to most early adopters of dual-layer writable DVD technology. http://www.emedialive.com/Articles/P...ArticleID=8421 Excellent article, thanks. Wow, there really is a lot to dual layer DVDs. The article answered in great detail how the different types are read. |
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On Fri, 04 Feb 2005 02:30:13 GMT, wrote:
What formats are the typical movie DVD's in that you buy or rent? Are they -R, +R, or some other type? Thanks, BB DVD-Video, which is may be considered a DVD-ROM type. (The dash is optional, but is officially present, as defined by the DVD forum). It may also be referred to unofficially as a "pressed DVD", as that's how they're made, and the data is stored as physical pits, rather than variations in opacity in an intermediary layer as with the writeable formats (see below). Look under the DVD bluebooks section: http://www.dvdforum.org/tech-dvdbook.htm DVD-R, DVD+R, DVD-RW, DVD+RW, DVD-RAM all refer to writeable formats. The -/+ rubbish doesn't apply to the DVDROM variants. --------------------------------------------- MCheu |
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Practically speaking an Apple will not read a DVD+, but will read a DVD-.
Commericially produced movies appear to be DVD- cause those propriatory Apple machines read'em. -- Jan Alter or "MCheu" wrote in message ... On Fri, 04 Feb 2005 02:30:13 GMT, wrote: What formats are the typical movie DVD's in that you buy or rent? Are they -R, +R, or some other type? Thanks, BB DVD-Video, which is may be considered a DVD-ROM type. (The dash is optional, but is officially present, as defined by the DVD forum). It may also be referred to unofficially as a "pressed DVD", as that's how they're made, and the data is stored as physical pits, rather than variations in opacity in an intermediary layer as with the writeable formats (see below). Look under the DVD bluebooks section: http://www.dvdforum.org/tech-dvdbook.htm DVD-R, DVD+R, DVD-RW, DVD+RW, DVD-RAM all refer to writeable formats. The -/+ rubbish doesn't apply to the DVDROM variants. --------------------------------------------- MCheu |
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On Sat, 05 Feb 2005 01:12:02 GMT, "Jan Alter"
wrote: Practically speaking an Apple will not read a DVD+, but will read a DVD-. Commericially produced movies appear to be DVD- cause those propriatory Apple machines read'em. The reasoning behind your statement is flawed. If I followed your line of reasoning then if I find a drive that doesn't read DVD-R discs very well, but does read DVD-ROM without problems, then DVD-ROM must be a DVD+. By the way, the BenQ 800A DVD+R burner is one such drive. All DVD drives have to be capable of reading the DVD-Video in order to be a DVD drive. Further, all DVD-ROM drives have to be capable of reading DVD-ROM by definition. DVD burners are backwards compatible with DVD-ROM drives. That's not to say that your statement is totally false. It's half true, in that the DVD-ROM and DVD-Video formats are endorsed by the DVD forum, which is the same group that originated the DVD-R format. However, that doesn't mean that your statement is right either. The problem is that the Alliance vs Forum (- vs +) rubbish only applies to writeable formats. The Alliance is an offshoot from the Forum group. The pressed DVD standards were never in dispute among those companies, otherwise there would be a DVD+ROM format out there somewhere (which there isn't). --------------------------------------------- MCheu |
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