Talk:DV (video format)

message: The article states that unlocked audio may cause a one-third frame sync offset. I'm not sure that this is correct - what unlocked audio means is that the audio sampling clock isn't phase locked to the video frame rate, so the samples per frame may vary very fractionally.
I have been editing DV for ten years, including match editing recovered programme material together from various tape and disk sources, and I have never seen a sync offset of more than a couple of samples.  —Preceding unsigned comment added by 91.84.80.40 (talk) 21:11, 2 February 2009 (UTC)
thread_title:  Locked audio 

message: Is it appropriate to put a link to the software that is mentioned in the article? The article mentions software which allows a MiniDV camcorder to be used as a data storage device but doesn't give the name or a link; this seems foolish. If we're going to mention the existence of the software, we might as well give the name.
The only software I could find which meets the description is called 'DV Backup,' it's $45 shareware, and it's from http://www.coolatoola.com/.
:Only one I know of is dvbackup, which is Free Software. I've never used it myself. --Brion 05:41, 20 Feb 2004 (UTC)
replies: text: There's also another one for Windows, DV Streamer.  Unfortunately, DV Backup is Mac OS X only, and dvbackup is Linux/Unix/POSIX OS only.  Backing up data to DV reminds me of the old systems back in the 80's that allowed you to back up your computer's data to a analog VHS videocassette by installing a special ISA-bus card that interfaced to your VHS/Betamax/what-have-you VCR.  Videotrax and Corvus were companies that made such hardware for backing up to VHS.  misternuvistor 03:22, 2 February 2006 (UTC)

text: Yes.  In fact, I feel the article is incomplete without it.  Searching for this info is what lead me to this article. -- Bilbo1507 (talk) 15:52, 14 March 2008 (UTC)
thread_title: DV for data backup

message: I've seen some mention of DV types 1 and 2.  Could something about this possibly be mentioned in the article?  Certain software apps only support type-2. — SimonEast 08:39, 15 Oct 2004 (UTC)
replies: text: If anyone is able to add this information, I would like the article to tell how to diagnose whether a file is Type 1 or Type 2. Robert K S 14:48, 1 February 2007 (UTC)
thread_title:  Type-1 vs Type-2 

message: The link to minidv just goes back to itself, I'm removing it, someone please tell me if I'm doing something wrong. Szabo 23:53, 9 Dec 2004 (UTC)
thread_title:  MiniDV 

message: Does anyone know if there are any reader/writers that allow people to read/write to/from dv and/or minidv tapes on a computer without using a camera?
--4.245.7.3 07:18, 20 May 2005 (UTC)
replies: text: Yes, at school we use a device that my teacher referred to as a "DV Camdeck", which looks like a smaller VCR; connects to the computer via firewire and accepts MiniDV, DV, and rear composite inputs.  I'll try to get a more specific model number. Ahanix1989 14:33, 15 September 2006 (UTC)

text: ) There is a wide selection of professional and semi-professional DVCam decks, by a variety of manufacturers.. Sony is one of the most common.
Using the camera as a deck is not reccomended by professionals, due to the excess wear it generates on the heads, but it is unavoidable if you can't afford a professional deck. --202.170.45.13 11:56, 19 June 2007 (UTC)
thread_title: Readers?

message: I would like to see something added about the history and development of the DV format. It also should be mentioned (if I am correct in this) that the Digital-8mm format uses the DV codec. —Preceding unsigned comment added by LexieM (talk • contribs) 
It would be nice to see information about what company/companies/consortium originally created the format, since the article seems to say that ISO standardization came after original "Blue Book" development. —SudoMonas 05:02, 14 August 2006 (UTC)
thread_title:  History and development of the DV format 

message: Does anyone know if/when the tapes fatigue?  GChriss 22:35, 18 March 2006 (UTC)
replies: text: To add to this question, a section on proper head cleaning would be helpful as well.  Thanks, GChriss <always listening><c> 19:15, 21 September 2006 (UTC)

text: At a certain point, there would be too much tape shedding of the tape surface.  This was a problem with LINEAR editing I believe, from shuttling the tape around.  ME is not quite as robust as MP tape.  I don't have actual figures myself though. Glennchan 22:28, 2 November 2006 (UTC)
replies: text: From my personal experience: I've not experienced any deterioration in tapes I've recorded over 8 years ago (even though I didn't actually bother with the "winding back and forth periodically" advice). Having said this: I use tapes once only, ie. I do not re-record. However, I did not look for a formal article about this, but if we really get stuck, I'll write one :) George Adam Horváth (talk) 09:56, 7 March 2011 (UTC)
thread_title:  Tape Lifetime 

message: Unlike DVD,VCD, etc., there is no resolution data included in the DV (miniDV) page. I am really an amateur. I noticed and read your technical discussion on DV resolution, but I am still in the mist - Is there simply a DV resolution of ???x??? can be quoted? or how can we compare the resolution between DVD and DV ?--Chan w 06:16, 9 March 2007 (UTC)
replies: text: 720x480.  -seinman 07:43, 9 March 2007 (UTC)
thread_title:  DV (miniDV) resolution again 

message: According to Keith Jack (Video Demystified - 5th Edition 2007 ISBN:978-0-7506-8395-1) DV has a special way of applying DCT to interlaced frames; each pair of (buffered) fields is compared, if they are 'similar' (low motion shift) standard 8-8-DCT is applied to the whole frame (both fields), but if the fields are "not similar" (high motion shift), "2-4-8-DCT" is applied to each field separately. The type of DCT block is recorded in the DC coefficient area using 1 bit. Sounds to me like this frame-or-field-DCT threshold will have a significant impact on interlacing artifacts ? Redbobblehat (talk) 15:39, 3 September 2008 (UTC)
replies: text: I would like to see the 2-4-8-DCT mentioned in the article and to be explained based on the usual (as most readers know from jpeg) 8-8-DCT (one sentence: "Since video is sometimes interlaced, there are two natural possibilities to apply the DCT: 2-4-8 for action scenes and 8-8 for a mostly still backgrounds with some small moving figures"). -- Arnero (talk) 09:12, 22 March 2010 (UTC)
thread_title:  DCT blocks 

message: According to Jack (op cit.) each DCT block covers 8 vertical x 8 horizontal samples in one of the Y'CbCr channels, and each DCT macroblock is made up of a number of DCT blocks. Due to chroma subsampling, each 4:2:0 or 4:1:1 macroblock consists of 4 luma plus 2 chroma DCT blocks. For 4:2:2 each macroblock has 2 luma and 2 chroma DCT blocks. The 4:2:2 macroblock has a 2:1 horizontal aspect ratio (covering 8x16 pixels), whereas the 4:2:0 are "square" (16x16 pixels) format and 4:1:1 has a (mostly) 4:1 horizontal AR (8x32 pixels). Redbobblehat (talk) 15:39, 3 September 2008 (UTC)
thread_title:  DCT macroblocks 

message: Track widths are mesured in micrometers, 10 and 15 for DV and DVCAM respectively, not millimeters as per a previous edit. This should not be confused with the width of the tape  (around 6mm)  —Preceding unsigned comment added by 132.185.144.122 (talk) 16:06, 10 March 2009 (UTC)
replies: text: Indeed, it looks like you are correct.  Sorry for the bad edit.  But thanks for the correction.  Cheers —fudoreaper (talk) 06:42, 11 March 2009 (UTC)
thread_title:  track widths 

message: I went ahead and remove the incorrect reference to Firewire being a feature of the minidv standard. Furthermore, Firewire was being incorrectly referred to as a non-linear editing system. It could be considered a source for non-linear editing.Witczak (talk) 18:32, 24 March 2009 (UTC)
thread_title:  Firewire is not a "feature" of minidv 

message: I have reverted the excision of the section on memory chips on DV cassettes.  Despite the excising editor's assertion that it was stupid, they certainly did have such embedded chips.  Whether or not such chips were EEPROM or not, however, is beyond my expertise.  Could someone who knows better please look at that section and correct whatever errors there might be in that description?  Thanks. Roregan (talk) 01:27, 11 September 2009 (UTC)
thread_title:  Memory Chips and EEPROM 

message: I altered the lead in sentence, as before it said the only format to record Progressive natively was DVCPro Progressive, which is no longer true. HDV 1080p got support to record natively back in 2006.  —Preceding unsigned comment added by 98.225.216.197 (talk) 19:04, 11 May 2010 (UTC)
replies: text: I changed it back, because HDV is not DV. If you interested about HDV, you can just follow the wikilink and read all about it, including native 1080p option. Mikus (talk) 22:59, 13 May 2010 (UTC)
thread_title:  Progressive Recording 

message: I noticed at the end of the page it indicates that 40 minutes of Digital8 video can be recorded on 1 hour 8/hi8 tapes. This doesn't seem accurate, since a 2 hour 8/hi8 tape will hold 1 hour of Digital8 video. Any thoughts? Brock1912 (talk) 07:08, 10 April 2011 (UTC)
replies: text: PAL tapes in D8 mode can record 2/3 of tape capacity in Hi8 mode, but in NTSC it is only 1/2. 77.113.93.250 (talk) 21:28, 26 October 2019 (UTC)
thread_title:  Digital8 recording times 

message: The citation that there is no problem comes from the very tape manufacturer that is causing the problem.  Although this could be branded original research, anyone can reproduce the problem more or less consistently (so I don't believe that Sony couldn't).  If you have a DV (or HDV) camcorder that has regularly digested only Sony tapes, you will not have had a problem.  You can insert a tape from any other manufacturer (TDK actually seems to work best for this purpose) and you will still have no problem.  Try several other brands and there is still no problem.  But as soon as you put a Sony tape back in, the residue of lubricant left behind on the heads instantly reacts with Sony's (different to anyone elses's) lubricant to form a hard residue on the heads that is difficult to remove.  One way of removing it is to ignore the instructions for the cleaning tape and run it through the tape drive for around a minute.  A beter way is to use a proper video head cleaning stick and isopropyl alcohol, but I have yet to come across a camcorder design where this last method can be satisfactorily executed. 86.181.54.64 (talk) 13:02, 24 June 2011 (UTC)
thread_title:  {{anchor|Dubious|date-November 2013}}Mixing tapes from different manufacturers 

message: The following paragraphs were embedded in hidden comments; I've moved them here instead.
DV has been designed as an interlaced video recording standard. After DV became a preferred format for low-budget digital cinema, it became apparent that filmout process required blending of fields, which caused loss of resolution and exhibited interlace artifacts not noticeable on a traditional interlaced television set. Similar issues arose when Web videos became popular, caused by inability of popular software to properly handle interlaced video. The above issues, along with desire of achieving film look, gave rise to camcorders capable of progressive-scan acquisition.
Recording time can be calculated if tape length is known. For example, standard MiniDV cassettes are loaded with 70 meters of tape. Baseline DV is recorded with 3/4-inch/sec speed, which gives about 60 minutes of recording time in DV mode or 40 minutes in DVCAM mode. Medium size cassettes are offered with tape ranging from 27 to 137 meters in length. Large cassettes can have from 70 to 259 meters of tape, offering up to 126 minutes of recording in DVCPRO25 mode.DVCPRO cassette tape
CREATE A PROPER COMPARISON TABLE FOR THESE NUMBERS
S: A 65 × 48 × 12 mm cassette can hold 60 minutes of standard DV video.
L: With dimensions of about 120 × 90 × 12 mm the large cassette can hold up to 4.6 hours of standard DV video. 80 minute tapes that use thinner tape are also available and can record 120 minutes of video in EP/LP mode.
Software is currently available for ordinary home computers which allows users to record any sort of computer data on MiniDV cassettes using common DV decks or camcorders. Though originally intended for the consumer market as a high-quality replacement for VHS, L-size DV cassettes are largely nonexistent in the consumer market, and are generally used only in professional settings. Even in professional markets, most DV camcorders support only MiniDV, though many professional DV VTRs support both sizes of tape.{{Citation needed|date=August 2008|I've never seen minidv anywhere other than distress purchases (a mortar has just blown up your normal camera), consumer, or "prosumer" hobbyists|132.185.144.120 (talk) 16:22, 7 August 2008 (UTC)
thread_title:  Hidden text 

message: The article does not explain/tell how data in encoded and/or compressed (like saying its raw PCM for audio cds); so is there such a specification ?--41.41.15.225 (talk) 15:13, 25 March 2014 (UTC)
thread_title:  encoding / compression 

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thread_title:  External links modified 

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thread_title:  External links modified 

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thread_title:  External links modified 

message: Currently the information is:
In both systems the active area contains 720 pixels per scanline, with 704 pixels used for content and 16 pixels on the sides left for digital blanking.
And this is a wrong information. First of all, the whole 720 samples contain image, therefore there is no digital blanking, the image in the first 9 and last 9 pixels are overscan and are not visible, when displayed on CRT, second, 704 is the value for NTSC, for PAL it is 702 samples of active image, 52μ sampled at 13,5MHz is 702 samples. Therefore the correct pixel aspect ratio for PAL is 1,094. 77.113.93.250 (talk) 21:34, 26 October 2019 (UTC)
thread_title:  ITU REC.601 wrong information. 

message: :The following is a closed discussion of a requested move. Please do not modify it. Subsequent comments should be made in a new section on the talk page. Editors desiring to contest the closing decision should consider a move review after discussing it on the closer's talk page. No further edits should be made to this discussion.
The result of the move request was: Moved to DV (video format). (closed by non-admin page mover) Reading Beans (talk) 18:22, 10 December 2023 (UTC)
replies: text: DV →  – (open to other suggested modifiers, like (format) or (video format)) No primary topic for this digram. Attempting to measure long-term signifiance, searches on Google Books, Scholar, and Search all have very mixed results, including for this video format, distance vector, dating or domestic violence, Diversity Visa, etc. Hameltion (talk | contribs) 20:38, 1 December 2023 (UTC)
thread_title:  Requested move 1 December 2023 

message: The maximum length for DVCPRO HD L-cassettes has made some confusion for me. While maximum length for DVCPRO L-cassettes is 126 minutes in DVCPRO25, these can record 31.5 minutes of DVCPRO HD video. Otherwise, 32-minute DVCPRO HD L-cassettes could record 128 minutes of DVCPRO25 video? It is the true maximum length of DVCPRO 
large cassettes or numbering error? HarmonZach (talk) 02:30, 10 January 2024 (UTC)
thread_title:  DVCPRO HD L-cassette maximum length