Talk:DVD-Video

message: Thanks for making this a new article. I was wondering whether there was a specific tag for an unfinished article as this? It does not have a lot of the basic things, like a heading and such. -- Sirius81 | Talk 16:21, 11 November 2006 (UTC)
thread_title:  Split from [[DVD]] 

message: I was trying to calculate the maximum video run-time with MPEG-2, but statements like "Up to 9.8 Mbit/s" are not sufficient. —The preceding unsigned comment was added by 69.123.228.58 (talk) 22:57, 5 December 2006 (UTC)
replies: text: There is no official limit in the specification for maximum movie length.  There is an effective lower bitrate limit of 300kb/s ~ 600kb/s due to the hardware restrictions of most DVD players, but that is not part of the DVD-Video standard per se.  (Hence why it is not directly mentioned in the article.  Yet, anyway)  There isn't really anything you can say about maximum run-time that is verifiable or neutral, really. -- Y|yukichigai 09:32, 6 December 2006 (UTC)

text: Another common misconception.  Unlike newer resolution specifications, DVD-based resolutions use what could be called "odd" resolutions that are subsequently stretched during playback to the appropriate shape.  720x480 can either be "squashed" to approximate 640x480 (4:3) or "stretched" to approximate 893x480 (16:9) on playback.  The rest of the resolutions are all squashed or stretched to the nearest 4:3 resolution.  As for why, there's a complex mathematical reason revolving around how the numbers can be factored.  Nobody's ever explained it to me in a manner that makes sense but they all assure me that its there. :P -- Y|yukichigai 05:53, 15 December 2006 (UTC)
thread_title:  Details of specifications 

message: I think this article should also reflect both the minimum audio/video bitrates dictacted by the official DVD standard and a notation on reasonable minimum values that is expected to work on most playback devices. I have not been able to figure this out myself, which is why i ask here instead of posting the info directly.
JoaCHIP 10:03, 11 January 2007 (UTC)
replies: text: Officially, DVD-Video has no minimum video bitrate.  The effective limit due to player compatibility seems to be between 300 and 600 kbps, but there's no citable evidence to support that.  As for the audio bitrate, I believe the page lists the acceptable bitrates for each codec, save for the AC-3 codec. (which I myself am not sure of) -- Y|yukichigai 18:04, 11 January 2007 (UTC)
thread_title:  Minimum bitrate 

message: Dvd  — Preceding unsigned comment added by 2001:D08:C4:531F:9440:FD26:1233:2A9C (talk) 00:55, 13 April 2024 (UTC)
replies: text: "Professional" here is used in the context of commercial releases, etc.  Hollywood studios, the adult film industry, and other such major video production sources use DVD-Video to release their productions, hence the word "professional".  By the same token, "consumer" is used because numerous pieces of easy-to-use software exist specifically for the purposes of allowing the home user to create DVD-Video content, as well as set-top DVD recorders and some digital camcorders.  Both of these are generally accepted definitions or uses.  -- Y|yukichigai (ramble argue check) 02:19, 1 April 2007 (UTC)

text: cinematic retail ?  --195.137.93.171 (talk) 19:21, 23 July 2010 (UTC)
thread_title:  Professional video format 

message: Concerning this sentence in the Region Codes section: Laws in the United States specifically prohibit the domestic sale of DVD players which are not set to Region 1 by default.
What laws, or is the effect accomplished by licensing agreements? It seems hard to believe congress has the authority to regulate something like this. AnotherBrian 13:20, 5 April 2007 (UTC)
replies: text: I agree. I don't know of any laws for region coding. I will revise the section to refer to the CSS license, which is what is used to enforce region coding. JimTheFrog 07:53, 9 April 2007 (UTC)
thread_title:  Region Codes 

message: "Professionally encoded videos average a bitrate of 3.5 Mbit/s with a maximum of 7-8 Mbit/s in high action scenes. Although this is typically done to enable greater compatibility amongst players, and to help prevent buffer underrun in the case of a dirty or scratched disc."
Does that second sentence make sense? Number one: it's a fragment sentence, number two: what is it talking about? The previous sentence looks like it's just listing the usual bitrate for professional production just in case someone is wondering. Maybe this sentence is referring to the bit about the raw dvd bitrate. You guys think it should be moved or edited or something? I think this paragraph and the previous one might have been one run-on sentence that someone split up. Gamingexpert13 09:47, 14 June 2007 (UTC)
thread_title:  Frame rate and other requirements 

message: Arccos is not part of the DVD-Video standard, and there are other anti-rip alternatives, so I have made changes accordingly. JimTheFrog 09:57, 18 July 2007 (UTC)
thread_title:  Anti-rip (Arccos) 

message: : For this reason, many discs are made with at most two audio languages to allow single-layer discs to be used.
As I understand it, the (slight) majority of PAL discs are dual layer. It's usually mentioned on the back cover. Most of my experience comes from Nordic editions (2x original-language audio, 4x subtitles, menus unlocalised or frugal if localised). A reference I googled says dual-layer discs are prevalent in Australia, too  (under "Compression ratio")
The text also seems to conveniently ignore the (bothersome) fact of region coding (no need to include languages that are not part of the target region), markets smaller than a region, and that multi-language releases are more expensive and slower to co-ordinate.
--MinorContributor 21:34, 20 July 2007 (UTC)
thread_title:  multiple languages & NTSC-centric view? 

message: Whoever wrote that DVDs don't often have more than one or two languages has never bought an Asian DVD. 
http://en.wikipedia.org/wiki/DVD-Video#Frame_rate_and_other_requirements
Most of the DVDs I buy have at least 3 languages and on average 4 (Cantonese, Mandarin, Thai, and Japanese, sometimes with Mongolian or Farsi as well) for audio alone; along with a half dozen subtitles. Lostinlodos 08:58, 4 August 2007 (UTC)
replies: text: This is not only true of Asian DVDs, it's also the case with European (or certainly British) ones which have on average 3 and sometimes many more language options for their soundtracks and many more for their subtitles. Andypreston (talk) 13:21, 30 November 2009 (UTC)
thread_title:  DVD Languages  

message: How many bits are used to represent each pixel's RGB + luminance values on the screen?  32?  24?  -  Theaveng 17:38, 6 September 2007 (UTC)
thread_title:  Bits per pixel?  

message: "Professionally encoded videos average a bitrate of 3.5 Mbit/s...."  Where did this come from?  I don't see a citation or source.  My own personal observations disagree with the statement, because my DVDs seem to hover around 5 Megabits/second, and that's why I'm wondering where this statistic came from.  -  Theaveng 17:45, 6 September 2007 (UTC)
replies: text: I agree that it is inaccurate, more like 5 Mbit/s or so. --Ray andrew 13:47, 7 September 2007 (UTC)
replies: text:  High quality Video DVDs come with 8Mbps video rate and low ones with 3Mbps and the
rest is in between -- Michael Janich (talk) 09:10, 7 December 2007 (UTC)
thread_title:  Average Bitrate == 3.5 Mbit/sec? 

message: Could someone please write about the pixel aspect ratio of 1.1:1 in PAL/4:3 and
1.xx:1 in PAL/16:9... It's an important aspect if you design an image for a DVD
and you want all the circles to be round. THANKS -- Michael Janich (talk) 09:10, 7 December 2007 (UTC)
thread_title:  Pixel aspect ratios 

message: Hi, I've added a couple of citations about the arrest and legal wrangle over DeCSS. The other statement that needs citation is one about "the vast majority of DVDs using AC-3" (rather than DTS). Anyone got any numbers, stats, sales figs we can point to? Jon (talk) 01:31, 18 June 2008 (UTC)
thread_title: Citations

message: There's no information about the various types of DVD packaging (Keep Cases, Snapper Cases, Steelbooks etc.) in this article.  —Preceding unsigned comment added by 86.43.64.115 (talk) 15:54, 20 August 2008 (UTC)
thread_title: Packaging

message: Due to multiple audio (and video) output sources, a consumer has many outputs on a DVD player, and may become confused with connecting their player to their TV and/or amplifier.
You should NOT write opinions to dictionary, because not all DVD users are americans and being confused with anything requiring common sense!
Someone, rephrase please.  —Preceding unsigned comment added by 72.144.149.241 (talk) 11:25, 13 February 2009 (UTC)
thread_title:  Confused consumers? 

message: Here are the two pictures both at the current 300 pixel resolution:
   	
{|  style="border:2px solid darkgray;" align="center" border="1"
PNG	SVG
   	
                                	
{|  cellpadding="1" align="center" style="background-color:#F8FCFF"
Which looks better to you(vote)?	Makyen (talk) 01:35, 19 February 2010 (UTC)
replies: text: I edited the SVG file to remove most of my objections.Makyen (talk) 20:14, 11 March 2010 (UTC)
thread_title: Vote for which picture

message: #Prefer PNG: The actual information displayed in the SVG is smaller (too much white space). I don't like the colors used for region 1 and 6 in the SVG (although I don't really like the color for region 6 in the PNG either and region 3 is hard to see... hmmm.).  There is a rendering error (caused by the RSVG engine used by Wikipedia, not in the original file) which almost connects South America to Cuba and significantly distorts that island chain.  The SVG render greatly exaggerates the relative size of  some islands and island groups. Makyen (talk) 01:35, 19 February 2010 (UTC)
replies: text: I edited the SVG file to remove most of my objections.Makyen (talk) 20:14, 11 March 2010 (UTC)
thread_title: PNG

message: Are you sure of the quoted bitrate for MP2 Audio:
MP2: 48 kHz sampling rate, 1 to 7.1 channels, up to 912 kbit/s?
Shouldn't this be 192 Kbit/s?
Andypreston (talk) 11:57, 15 September 2009 (UTC)
thread_title:  MP2 Audio Max Bitrate 

message: Nowhere in the article doea it tell us what the colour format is.  Is it 4:2:2, 4:2:0, 4:1:1 or what? 86.182.66.217 (talk) 17:13, 29 May 2010 (UTC)
thread_title:  Colour Format 

message: The successors section reads like it was written by someone who doesn't like Blu-ray and wants it to fail somehow.  Like it or not, Blu-ray won the format war by a significant margin.  And despite the people who try to marginalize it, Blu-ray has actually been beating various of DVD's records for rate of adoption by the public.  Whereas this section reads like Blu-ray is an anemic and failed attempt to replace DVD.  That's rather misleading and does not represent what's happening out in the real world.   98.248.74.209 (talk) 23:19, 30 May 2010 (UTC)
thread_title:  POV about Blu-ray 

message: There is a dearth of information on the subject of Jacket Picture.  While basic information about file names can be found (e.g. on the German Wikipedia page for DVD-Video) there is little information telling users who is using the Jacket Picture and how.  If someone can find a web site showing that information it would be wonderful to add it. Dcsutherland (talk) 02:33, 7 July 2010 (UTC)
thread_title:  Jacket Picture 

message: This page only mentions 25 and 29.97 frames per second as valid encodings. The 24p page claims that Hollywood authors movies on DVD at 24 frames per second. This seems like a direct factual conflict. Neither article has much in the way of references (but I haven’t tagged them as such quite yet). If anybody knows the answer and can cite sources, please fix the article(s) and/or add citations. MacMog (talk) 04:05, 30 March 2011 (UTC)
replies: text: The DVD-Video#Frame_size_and_frame_rate chapter says: "MPEG-2 formats support both interlaced and progressive-scan content, with the latter being encoded within interlaced stream using pulldown." And: "A DVD player uses flags to convert progressive content into interlaced video suitable for interlaced TV sets. These flags also help reproducing progressive content on progressive-scan television sets." It also has a reference. DVD-Video spec is not very obvious to understand. Video can be encoded either as frames or fields, but it is still field-based. Only the compression can be frame-based for efficiency, logically video still consists of fields and is supposed to be output by DVD player in interlaced form. Hence, 24p video can be encoded as 24fps frames, but pulldown flags are set to "hint" the decoder how to convert it into 60i (or 30i in frame-based notation). The DVD-Video spec appeared when people were still using interlaced CRT-based TVs. For current generation of progressive-scan TVs there is no need to output interlaced video. Thus, DVD players are using these flags to figure out if the content is progressive, and if yes, they output it as progressive. This is sort of against the original DVD-Video spec, but it works better for modern TVs. Read this too: http://www.hometheaterhifi.com/the-dvd-benchmark/177-dvd-benchmark-part-5-progressive-scan-dvd.html I will add this link as a reference. Mikus (talk) 20:57, 7 September 2011 (UTC)
thread_title:  DVDs: 24fps or not? 

message: Currently it says: 4 hours. This is actually longer than I thought, I always figured above 180 minutes it's pushing it. Is there any official (yet public) information or guideline on max runtime / min bitrate? Spiny Norman (talk) 23:58, 21 December 2017 (UTC)
thread_title:  Max runtime DVD9? (AKA min bitrate)? 

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thread_title:  External links modified 

message: The first sentence says 'DVD-Video is a consumer video format used to store digital video on DVD discs, and as of 2003 is the dominant consumer video format in Asia, North America,[4] Europe, and Australia.' My question is, is the fact that it was the most dominant format in 2003 relevant today? I guess this line should just be taken away. NeuronalBurst (talk) 08:16, 12 June 2018 (UTC)
thread_title:  Introduction 

message: I remember reading that, in the early years of DVD drives, computers were not fast enough to handle the decoding of the MPEG-2 on DVD discs, and so pass-through video cards were developed to help take some of the work of decoding MPEG-2 off of the CPU and video card. Though as video card and CPU technology evolved tremendously during that time period (we went from 200Mhz processors to 1Ghz in a three-year time span, and from 16MB to 128MB video cards in the same span), these cards quickly became obsolete. I think this warrants a mention in the article. MightyArms (talk) 18:11, 23 September 2022 (UTC)
thread_title:  Computer cards?